Evaluation system, evaluation method, and evaluation program

Abstract

To provide a technique that makes it easier to analyze a molded body made from fiber composite materials containing short fibers.SOLUTION: An evaluation device (1) that evaluates a mechanical property of a molded body molded by a three dimensional printer by using composite materials containing short fibers and matrix resin includes: an acquisition part (11) that acquires information indicating the mechanical property of the short fibers, information indicating the mechanical property of the matrix resin, information indicating a shape of the molded body, and a tensile elastic modulus of the composite material; and an output control part (15) that outputs analysis results obtained by analyzing the mechanical property of the molded body by using the information acquired by the acquisition part (11) and the tensile elastic modulus.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an evaluation system, an evaluation method, and an evaluation program for evaluating a molded body formed by a three-dimensional printer. [Background technology]

[0002] 3D printers can create complex shapes that are difficult to cast without using molds, so they are widely used in various fields such as manufacturing to create prototype models and toys. In 3D printing, additive manufacturing methods using thermoplastic resins are generally used. The additive manufacturing method using thermoplastic resins has the disadvantage that it is not suitable for components that require particular strength, such as structural components for aerospace and automobiles, because the resin itself has low thermal, chemical, and mechanical stability. Therefore, in recent years, 3D printing using fiber composite materials including short carbon fiber and continuous carbon fiber has been proposed. In addition, Non-Patent Document 1 describes the Cox-Krenchel model for calculating the tensile modulus of a fiber composite material. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] JL Thomason and MA Vlug, "Influence of fiber length and concentration on the properties of glass fiber-reinforced polypropylene: 1. Tensile and flexural modulus", 1995 Summary of the Invention [Problem to be solved by the invention]

[0004] For an isotropic material, the following relationship holds between the shear modulus G (also called the rigidity modulus or transverse elastic modulus), the tensile modulus E (also called the Young's modulus or longitudinal elastic modulus), and the Poisson's ratio γ:

number

[0005] One aspect of the present invention aims to provide an evaluation system, an evaluation method, and an evaluation program that can more easily analyze a molded body made from a fiber composite material containing short fibers. [Means for solving the problem]

[0006] In order to solve the above problems, an evaluation system according to one embodiment of the present invention is an evaluation system that evaluates the mechanical properties of a molded body formed by a 3D printer using a composite material containing short fibers and a matrix resin, and includes an acquisition unit that acquires information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information representing the shape of the molded body, and the tensile modulus of the composite material, and an output unit that outputs analysis results of the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit.

[0007] Furthermore, an evaluation method according to one embodiment of the present invention is a method for evaluating the mechanical properties of a molded body formed by a 3D printer using a composite material containing short fibers and a matrix resin, and includes the steps of acquiring information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information representing the shape of the molded body, and the tensile modulus of the composite material, and outputting an analysis result of analyzing the mechanical properties of the molded body using the information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information representing the shape of the molded body, and the tensile modulus of the composite material.

[0008] In addition, an evaluation program according to one embodiment of the present invention is an evaluation program for causing a computer to function as an evaluation device for evaluating the mechanical properties of a molded body formed by a 3D printer using a composite material containing short fibers and a matrix resin, and functions as an acquisition unit that acquires information indicating the mechanical properties of the short fibers and the tensile modulus of the composite material, and an output unit that outputs analysis results of the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit.

[0009] The evaluation system according to each aspect of the present invention may be realized by a computer. In this case, the evaluation program for the evaluation system that realizes the evaluation system on a computer by causing the computer to operate as each part (software element) of the evaluation system, and the computer-readable recording medium on which the evaluation program is recorded, also fall within the scope of the present invention. Effect of the Invention

[0010] According to one aspect of the present invention, a molded body produced by a three-dimensional printer using a composite material containing short fibers can be more easily analyzed. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing a configuration of an evaluation system according to a first embodiment of the present invention. [Diagram 2]FIG. 1 is a flow chart showing an example of the flow of an evaluation method according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing an example of a parameter input screen displayed by the structural analysis software according to the first embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [Embodiment 1] An embodiment of the present invention will be described in detail below. Fig. 1 is a block diagram showing the configuration of an evaluation device 1 according to this embodiment. The evaluation device 1 has a function of evaluating the mechanical properties of a molded body formed by a three-dimensional printer using a composite material containing short fibers and a matrix resin. The evaluation device 1 is an example of an evaluation system according to the present disclosure.

[0013] [Composite materials] In an embodiment of the present invention, the composite material includes short fibers and a matrix resin. More specifically, the composite material is usually composed of short fibers and a matrix resin impregnated in the short fibers.

[0014] <Matrix resin> The matrix resin in the composite material can be appropriately selected from resins that can be used for molding with a three-dimensional printer, and may be a thermoplastic resin or a photocurable resin. The matrix resin may be one type or a combination of two or more types. Examples of thermoplastic resins include polycarbonate, acrylonitrile-butadiene-styrene (ABS), acrylate-styrene-acrylonitrile (ASA), polylactic acid, PETG (polyethylene terephthalate copolymerized with cyclohexane dimethanol), polyurethane (TPU), polystyrene, nylon, acrylic, polyether ether ketone (PEEK), polyolefin, polyamide, and mixtures of two or more types of these. Examples of photocurable resins include epoxy resins, acrylic resins, and mixtures of these. The matrix resin is preferably a thermoplastic resin from the viewpoint of being suitable for use in molding with a three-dimensional printer, and is preferably a photocurable resin from the viewpoint of exhibiting high strength after molding, and can be used depending on the device.

[0015] <Short fibers> The short fibers in the composite material can be appropriately selected from fibers having properties that reinforce the molded body. The fibers may be one or more types. As an example, the short fibers according to the present disclosure include at least one of carbon fibers, aramid fibers, acrylic fibers, metal fibers, and glass fibers.

[0016] The fiber length of the short fibers can be appropriately determined, for example, from the viewpoint of the type of fiber and the strength required for the molded body. From the viewpoint of improving the strength of the obtained molded body, the fiber length is preferably 10 μm or more, more preferably 50 μm or more, and even more preferably 100 μm or more. On the other hand, from the viewpoint of facilitating molding by a three-dimensional printer and better exerting the fiber characteristic of improving the rigidity of the molded body, the fiber length is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 10 mm or less.

[0017] In the embodiment of the present invention, the fiber length of the short fibers in the molded product is determined as a measured value of the length of the fibers at any location including the surface and cross section of the resin molded product, for example.

[0018] The thickness of the fibers can be appropriately determined within the range that allows the molded article to exhibit the desired strength, and may be, for example, 3 to 150 μm.

[0019] Examples of the fibers include glass fibers, aramid fibers, carbon fibers, polyethylene fibers, and mixtures thereof. From the viewpoint of developing the desired mechanical properties of the molded article, it is preferable that the fibers are one or more types of fibers selected from the group consisting of glass fibers, aramid fibers, and carbon fibers.

[0020] The fiber content in the molded product is substantially the same as the fiber content in the composite material. From the viewpoint of fully expressing the characteristics of the fiber in the molded product, the fiber content in the composite material is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, and even more preferably 40% by mass or more. From the viewpoint of fully expressing the characteristics of the material other than the fiber in the molded product, the fiber content in the composite material is preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 60% by mass or less. If the content of the material other than the fiber in the composite material is the lower limit or more, the resin characteristics are fully expressed, and if it is the upper limit or less, the fiber characteristics are fully expressed, which is preferable.

[0021] The fiber may be in the form of a single fiber or a fiber bundle.

[0022] <Other ingredients> In the embodiment of the present invention, the molded body and the composite material may further contain other components other than the matrix resin and the short fibers, as long as the effects of the present invention can be obtained. The other components may be one or more. Examples of the other components include a filler, a polymerization initiator, and a lubricant.

[0023] <3D printer> The 3D printer creates a molded object using a composite material. The 3D printing method includes, for example, a material extrusion method and a fused deposition modeling method, but the method is not limited to these, and the molded object may be created using other methods.

[0024] [Evaluation device configuration] The evaluation device 1 includes a control unit 10, a storage unit 20, a communication unit 30, an input unit 40, and an output unit 50. The evaluation device 1 is, for example, a general-purpose computer.

[0025] <Communications Department> The communication unit 30 communicates with devices external to the evaluation device 1 via a communication line. Although the specific configuration of the communication line does not limit this exemplary embodiment, examples of the communication line include a wireless LAN (Local Area Network), a wired LAN, a WAN (Wide Area Network), a public line network, a mobile data communication network, or a combination of these. The communication unit 30 transmits data supplied from the control unit 10 to other devices, and supplies data received from other devices to the control unit 10.

[0026] <Input section> The input unit 40 is configured to receive input to the evaluation device 1, and includes, for example, input devices such as a keyboard, a mouse, a touch panel, a camera, and a microphone. The input unit 40 may also be configured to receive data from the input devices via an interface such as a Universal Serial Bus (USB).

[0027] <Output section> The output unit 50 is a component for performing output from the evaluation device 1, and includes, for example, output devices such as a display, a printer, a touch panel, a speaker, etc. The output unit 50 may be configured to include an interface such as a USB, and may be configured to output data to the output device via the interface.

[0028] <Storage section> The memory unit 20 stores various types of information referenced by the control unit 10. Examples of such information include mechanical property information D1, shape information D2, tensile elastic modulus D3, and analysis results D4. The mechanical property information D1, shape information D2, and tensile elastic modulus D3 are data acquired by the evaluation device 1. The analysis results D4 are information indicating the results of analyzing the molded body.

[0029] The mechanical property information D1 includes information indicating the mechanical property of the short fiber contained in the composite material and information indicating the mechanical property of the matrix resin contained in the composite material. f , tensile modulus E f , fiber length L, fiber diameter D, fiber radius r, and average inter-fiber distance R in the molded product. However, the information indicating the mechanical properties of the short fibers is not limited to the above examples, and may include other information.

[0030] In addition, the information showing the mechanical properties of the matrix resin is, for example, the tensile modulus E m , the shear modulus of the matrix resin G m , and volume fraction (1-V f However, the information indicating the mechanical properties of the matrix resin is not limited to the above examples, and may include other information.

[0031] The shape information D2 is information that represents the shape of the molded body. The shape information D2 includes at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, roundness, cylindricity, coaxiality, concentricity, and profile of the molded body. However, the shape information D2 is not limited to the above examples and may include other information.

[0032] The tensile modulus D3 is the tensile modulus of the composite material. As an example, the tensile modulus D3 is an actual measurement value obtained by performing a tensile experiment on a molded body formed by a 3D printer using the composite material. However, the tensile modulus D3 is not limited to the above example. The tensile modulus D3 is the tensile modulus E of the composite material, which is substituted into the Cox-Krenchel model described later. c It is.

[0033] <Control Unit> The control unit 10 includes an acquisition unit 11, an orientation coefficient calculation unit 12, a molded body analysis parameter calculation unit 13, an analysis unit 14, and an output control unit 15. Each unit of the control unit 10 is realized by the control unit 10 reading out and executing a computer program stored in the storage unit 20.

[0034] (Acquisition Department) The acquiring unit 11 acquires the mechanical property information D1, the shape information D2, and the tensile modulus of elasticity D3. As an example, the acquiring unit 11 acquires the mechanical property information D1, the shape information D2, and the tensile modulus of elasticity D3 input by a user of the evaluation device 1 using the input unit 40. As an example, the acquiring unit 11 may acquire the information by receiving the information from another device via the communication unit 30. As an example, the acquiring unit 11 may acquire the information by reading the information from a storage destination (which may be in a storage device of the evaluation device 1 or may be a storage device outside the evaluation device 1) specified by the user of the evaluation device 1.

[0035] (Orientation coefficient calculation section) The orientation coefficient calculation unit 12 calculates the orientation coefficient η 0 that represents the fiber orientation of the molded body, using the information acquired by the acquisition unit 11 and a model that represents the relationship between the information and the orientation coefficient of the composite material.

[0036] Here, for example, the Cox-Krenchel model is used as the model. The Cox-Krenchel model is a method for determining the tensile modulus E of a composite material having ideally arranged fibers. cThe Cox-Krenchel model is expressed by the following equation (1). The Cox-Krenchel model is described by adding the effects of orientation and fiber length as coefficients to a model that simply follows the linear composite law.

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[0037] In the above formula (1), E c is the tensile modulus of the composite material, and V f is the volume fraction of short fibers. E f is the tensile modulus of the short fiber. E m is the tensile modulus of the matrix resin, and G m is the shear modulus of the matrix resin.

[0038] Also, η l is a correction coefficient, which is used to calculate the effective elastic modulus of the fiber from the difference in the displacement of the short fiber and the matrix resin when a displacement is applied to the composite material. Here, L is the fiber length of the short fiber, D is the fiber diameter of the short fiber, r is the fiber radius of the short fiber, and R is the average inter-fiber distance of the short fiber. Also, X i is the packing factor, which is 4.0 for square-packing.

[0039] In addition, in formula (1), η0 is an orientation coefficient. For example, the orientation coefficient η0 is 1 when the fibers are uniaxially oriented in the molded object, 3 / 8 when they are 2D randomly oriented, and 1 / 5 when they are 3D randomly oriented.

[0040] Thus, in the Cox-Krenchel model, the tensile modulus of the composite material, E c is the tensile modulus of the short fiber E f , tensile modulus of matrix resin E m , short fiber volume fraction V f It can be seen that the fiber diameter D and fiber length L (i.e., aspect ratio) affect the fiber strength.

[0041] When the Cox-Krenchel model is used, the orientation coefficient calculation unit 12 calculates the orientation coefficient η0 by substituting the information acquired by the acquisition unit 11 and the tensile modulus D3 into the Cox-Krenchel model. f , tensile modulus E f , tensile modulus E m , shear modulus G m , fiber length L, fiber diameter D, fiber radius r, average fiber spacing R, and tensile modulus E c The orientation coefficient η0 is calculated by substituting into the above formula (1).

[0042] (Parameter calculation section for molding analysis) The molded body analysis parameter calculation unit 13 calculates molded body analysis parameters based on the orientation coefficient η0 representing the fiber orientation of the molded body. The molded body analysis parameters are parameters used in the analysis of a molded body formed by a three-dimensional printer. The molded body analysis parameters include the tensile modulus and the shear modulus in one or more directions of the composite material. The molded body analysis parameters may further include at least one of the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat. However, the molded body analysis parameters are not limited to the above examples and may include other parameters.

[0043] (Analysis Department) The analysis unit 14 uses the calculated parameters for analyzing the molded body to analyze deformation and stress of the molded body produced by the three-dimensional printer.

[0044] (Output section) The output control unit 15 outputs the analysis results obtained by analyzing the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit 11. As an example, the output control unit 15 may output the analysis results to an output device of the output unit 50, or may output the analysis results by transmitting the analysis results to another device via the communication unit 30. The output control unit 15 may also output the analysis results by writing the analysis results in a storage destination (which may be in the storage device of the evaluation device 1 or may be a storage device outside the evaluation device 1) designated by the user of the evaluation device 1.

[0045] [Evaluation method flow] Fig. 2 is a flow diagram showing an example of the flow of the evaluation method according to the present embodiment. The evaluation method shown in Fig. 2 is a method for evaluating the mechanical properties of a molded body produced by a three-dimensional printer using a composite material containing short fibers and a matrix resin.

[0046] <Step S11> In step S11, the acquisition unit 11 acquires mechanical property information (information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin), shape information indicating the shape of the molded body, and the tensile modulus of elasticity of the composite material. As an example, the acquisition unit 11 acquires the above information from the memory unit 20. As an example, the information indicating the mechanical properties of the short fibers and the information indicating the mechanical properties of the matrix resin acquired by the acquisition unit 11 are actual values ​​measured in advance for each material. Also, as an example, the information indicating the shape of the molded body acquired by the acquisition unit 11 is information indicating the shape specified by the customer who ordered the molding of the molded body and CAD data.

[0047] The tensile modulus of elasticity of the composite material acquired by the acquisition unit 11 is, for example, an actual measured value obtained by performing a tensile experiment on a molded body that is produced in advance using the composite material by a three-dimensional printer.

[0048] <Step S12> In step S12, the orientation coefficient calculation unit 12 calculates the orientation coefficient η 0 by substituting the information acquired in step S11 into the Cox-Krenchel model.

[0049] At this time, the orientation coefficient calculation unit 12 calculates the tensile modulus E when the orientation coefficient η0 is substituted with "1". c Calculate the tensile modulus E c and the tensile modulus E obtained in step S11 c The result of the comparison may be used as a guide for the calculated orientation coefficient η0.

[0050] <Step S13> In step S13, the molded body analysis parameter calculation unit 13 generates a homogenized model by a homogenization method using the orientation coefficient η0 calculated in step S12. Here, the homogenization method is a method of replacing a non-homogeneous composite material with an equivalent homogenized material model (homogenized model) and analyzing it using equivalent physical property values. The homogenized model is a model in which a molded body made of a composite material is replaced with a single material by the homogenization method, and is a model that reproduces the fiber orientation of the composite material in a pseudo manner.

[0051] <Step S14> In step S14, the molded body analysis parameter calculation unit 13 calculates the molded body analysis parameters using the homogenized model generated in step S13. For example, a general-purpose structural analysis software is used for the calculation process of the molded body analysis parameters. When the general-purpose structural analysis software is used, the molded body analysis parameter calculation unit 13 can obtain the molded body analysis parameters by, for example, inputting the homogenized model generated in step S13 and the mechanical property information D1 of the matrix resin and short fibers acquired by the acquisition unit 11 into the structural analysis software.

[0052] <Step S15> In step S15, the analysis unit 14 analyzes the molded body produced by the three-dimensional printer using the calculated parameters for analyzing the molded body. For example, general-purpose additive manufacturing analysis software can be used for the analysis process of the molded body.

[0053] 3 is a diagram showing an example of a parameter input screen displayed by the additive manufacturing analysis software. In the screen of FIG. 3, as the physical property parameters of the homogenized model (the parameters for the above-mentioned molded body analysis), "Young's modulus [MPa]", "rigidity modulus [MPa]", "Poisson's ratio", "linear expansion coefficient [ / °C]", "density [kg / m 3 ]," "Specific heat [J / kg / m 3 ]" and "Thermal conductivity [W / m / ℃]". In the "Young's modulus [MPa]" field, the tensile modulus of the molded body in each of the three directions (e.g., MD, TD, and ND) is entered. In the "Modulus of rigidity [MPa]" field, the shear modulus of the molded body in each of the three directions is entered. In the "Poisson's ratio" field, the Poisson's ratio in each of the three directions is entered. In the "Linear expansion coefficient [ / ℃]" field, the linear expansion coefficient in each of the three directions is entered. "Density [kg / m 3 ]," "Specific heat [J / kg / m 3 The density, specific heat, and thermal conductivity of the homogenized model are entered in the "Density [W / m / ℃]" and "Thermal Conductivity [W / m / ℃]" fields, respectively.

[0054] In addition to the parameters shown in FIG. 3, the printing temperature, the ambient temperature during printing, the ambient temperature during cooling, etc. may be input as parameters to be used in the additive manufacturing analysis.

[0055] The analysis results obtained by the analysis processing of the molded body include, for example, the amount of deformation and stress.

[0056] <Step S16> In step S16, the output control unit 15 outputs the analysis results of the molded body. For example, the output control unit 15 outputs the analysis results by displaying the analysis results on a display or transmitting the analysis results to a customer's terminal via the communication unit 30.

[0057] As described above, according to this embodiment, the evaluation device 1 acquires information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information indicating the shape of the molded body, and the tensile modulus of the composite material, and outputs the analysis results obtained by analyzing the mechanical properties of the molded body using the acquired information. This allows a user such as a customer to understand the analysis results of the molded body to be molded without actually molding the molded body.

[0058] According to this embodiment, the evaluation device 1 calculates an orientation coefficient that represents the fiber orientation of the molded body using information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, and the tensile modulus of the composite material. By calculating parameters for analyzing the molded body using the orientation coefficient calculated in this manner, it is possible to generate analysis results for the molded body without performing measurement experiments for the shear modulus, etc., of the molded body.

[0059] [Variations] The functions of the evaluation device 1 described above may be shared and implemented by a plurality of devices. For example, the evaluation device 1 described above may be realized as an evaluation system in which two or more devices are connected via a communication network. In this case, the evaluation system may be, for example, a system having a first device including an acquisition unit 11, an orientation coefficient calculation unit 12, a molded body analysis parameter calculation unit 13, and an output control unit 15, and a second device including an analysis unit 14.

[0060] In the above embodiment, the orientation coefficient calculation unit 12 calculates the orientation coefficient η0 using the mechanical property information D1 and the tensile modulus of elasticity D3, but the evaluation device 1 may calculate the orientation coefficient η0 by other methods. For example, the orientation coefficient calculation unit 12 may calculate the orientation coefficient η0 by performing an image analysis process on the composite material.

[0061] In the above embodiment, the evaluation device 1 executes the evaluation method shown in Fig. 2, but at least some steps included in the evaluation method according to the present disclosure may be performed by a user of the evaluation device 1. For example, the calculation process of the orientation coefficient in step S12 in Fig. 2 may be performed not by the evaluation device 1 but by, for example, the user of the evaluation device 1.

[0062] [Software implementation example] The functions of the evaluation device 1 (hereinafter referred to as the "device") can be realized by a program for causing a computer to function as the device, and a program for causing a computer to function as each control block of the device (particularly each part included in the control unit 10).

[0063] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The control device and storage device execute the program to realize each function described in each of the above embodiments.

[0064] The program may be non-transitory and may be recorded in one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be provided to the device via any wired or wireless transmission medium.

[0065] In addition, some or all of the functions of each of the control blocks can be realized by a logic circuit. For example, an integrated circuit in which a logic circuit that functions as each of the control blocks is formed is also included in the scope of the present invention. In addition, the functions of each of the control blocks can be realized by, for example, a quantum computer.

[0066] Furthermore, each process described in each of the above embodiments may be executed by AI (Artificial Intelligence). In this case, the AI ​​may be executed by the control device or another device (for example, an edge computer or a cloud server).

[0067] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0068] [summary] The evaluation system of aspect 1 of the present invention is an evaluation system for evaluating the mechanical properties of a molded body formed by a 3D printer using a composite material containing short fibers and a matrix resin, and includes an acquisition unit that acquires information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information representing the shape of the molded body, and the tensile modulus of the composite material, and an output unit that outputs analysis results of the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit.

[0069] According to the above aspect, a molded article made of a composite material containing short fibers can be more easily analyzed.

[0070] The evaluation system of aspect 2 of the present invention, in the evaluation system described in aspect 1 above, further comprises a molded body analysis parameter calculation unit that calculates molded body analysis parameters including a tensile modulus and a shear modulus in one or more directions of the composite material based on an orientation coefficient representing the fiber orientation of the molded body, and the output unit outputs the analysis results of analyzing the molded body further using the molded body analysis parameters calculated by the molded body analysis parameter calculation unit.

[0071] According to the above aspect, by using the molded body analysis parameters calculated using the orientation coefficient, a molded body made of a composite material containing short fibers can be more easily analyzed.

[0072] The evaluation system according to aspect 3 of the present invention is the evaluation system described in aspect 2 above, further comprising an orientation coefficient calculation unit that calculates an orientation coefficient representing the fiber orientation of the molded body using the information acquired by the acquisition unit and a model representing the relationship between the information and the orientation coefficient of the composite material.

[0073] According to the above aspect, by using an orientation coefficient calculated using information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin, it is possible to calculate molded body analysis parameters for analyzing the molded body.

[0074] The evaluation system according to aspect 4 of the present invention is the evaluation system described in aspect 3 above, wherein the parameter calculation unit for molding analysis generates a homogenization method model that simulates the fiber orientation of the composite material by a homogenization method using the orientation coefficients calculated by the orientation coefficient calculation unit, and calculates the parameters for molding analysis using the generated homogenization method model.

[0075] According to the above aspect, by using an equalization method model generated using an orientation coefficient calculated from information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin, it is possible to more easily analyze molded bodies made from composite materials.

[0076] The evaluation system of aspect 5 of the present invention is the evaluation system described in aspect 3 above, wherein the orientation coefficient calculation unit calculates the orientation coefficient by substituting the information acquired by the acquisition unit and the tensile modulus into a Cox-Krenchel model.

[0077] According to the above aspect, by using the orientation coefficient calculated using the Cox-Krenchel model, a molded body made of a composite material can be more easily analyzed.

[0078] The evaluation system according to a sixth aspect of the present invention is the evaluation system according to any one of the first to fifth aspects, wherein the information indicating the mechanical properties of the short fibers includes at least one of the volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average inter-fiber distance in the molded body of the short fibers.

[0079] According to the above aspect, by using at least one of the short fiber volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average inter-fiber distance in the molded body, it is possible to more accurately analyze a molded body formed using a mixed material.

[0080] The evaluation system according to a seventh aspect of the present invention is the evaluation system according to any one of the first to sixth aspects, wherein the information indicating the mechanical properties of the matrix resin includes at least one of the tensile modulus of the matrix resin, the shear modulus of the matrix resin, and the volume content.

[0081] According to the above aspect, by using at least one of the tensile modulus of the matrix resin, the shear modulus of the matrix resin, and the volume content, information indicating the mechanical properties of the matrix resin can be used to more accurately analyze a molded body formed using a mixed material.

[0082] The evaluation system of aspect 8 of the present invention is the evaluation system described in aspect 2 above, wherein the parameters for analyzing the molded body further include at least one of the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat.

[0083] According to the above aspect, by using at least one of the parameters for analyzing a molded body, which are the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat, the molded body can be analyzed with higher accuracy.

[0084] An evaluation system according to a ninth aspect of the present invention is an evaluation system according to any one of the first to eighth aspects above, wherein the information representing the shape of the molded body includes at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, circularity, cylindricity, coaxiality, concentricity, and profile of the molded body.

[0085] According to the above aspect, the molded body can be analyzed more accurately by using at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, circularity, cylindricity, coaxiality, concentricity, and profile of the molded body.

[0086] The evaluation system according to a tenth aspect of the present invention is the evaluation system according to any one of the first to ninth aspects, wherein the short fibers include at least one of carbon fibers, aramid fibers, acrylic fibers, metal fibers, and glass fibers.

[0087] According to the above aspect, it is possible to more easily analyze a molded body made of a composite material including at least one of carbon fiber, aramid fiber, acrylic fiber, metal fiber, and glass fiber.

[0088] An evaluation system according to an eleventh aspect of the present invention is the evaluation system according to any one of the first to tenth aspects, wherein the matrix resin is a thermoplastic resin.

[0089] According to the above aspect, a molded article made of a composite material containing a thermoplastic resin can be more easily analyzed.

[0090] The evaluation system according to a twelfth aspect of the present invention is the evaluation system according to the eleventh aspect, wherein the thermoplastic resin includes at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide.

[0091] According to the above aspect, it is possible to more easily analyze molded objects made from composite materials including at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide.

[0092] In addition, an evaluation method according to aspect 13 of the present invention is a method for evaluating the mechanical properties of a molded body formed by a 3D printer using a composite material containing short fibers and a matrix resin, and includes the steps of acquiring information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information representing the shape of the molded body, and the tensile modulus of the composite material, and outputting analysis results of the mechanical properties of the molded body using the information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information representing the shape of the molded body, and the tensile modulus of the composite material.

[0093] According to the above aspect, a molded article made of a composite material containing short fibers can be more easily analyzed.

[0094] The evaluation method of aspect 14 of the present invention, in the evaluation method described in aspect 13 above, further includes a step of calculating molded body analysis parameters including a tensile modulus and a shear modulus in one or more directions of the composite material based on an orientation coefficient representing the fiber orientation of the molded body, and in the outputting step, the analysis results of the molded body are output by further using the molded body analysis parameters calculated in the calculating step of the molded body analysis parameters.

[0095] According to the above aspect, by using the molded body analysis parameters calculated using the orientation coefficient, a molded body made of a composite material containing short fibers can be more easily analyzed.

[0096] The evaluation method of aspect 15 of the present invention, in the evaluation method described in aspect 13 above, further includes an orientation coefficient calculation step of calculating an orientation coefficient representing the fiber orientation of the molded body using the information acquired in the acquiring step and a model representing the relationship between the information and the orientation coefficient of the composite material.

[0097] According to the above aspect, by using an orientation coefficient calculated using information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin, it is possible to calculate molded body analysis parameters for analyzing the molded body.

[0098] An evaluation method according to aspect 16 of the present invention is the evaluation method described in aspect 15 above, in which, in the step of calculating the parameters for molded body analysis, a homogenization method model that simulates the fiber orientation of the composite material is generated by a homogenization method using the orientation coefficients calculated in the step of calculating the orientation coefficients, and the parameters for molded body analysis are calculated using the generated homogenization method model.

[0099] According to the above aspect, by using an equalization method model generated using an orientation coefficient calculated from information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin, it is possible to more easily analyze molded bodies made from composite materials.

[0100] The evaluation method of aspect 17 of the present invention is the evaluation method described in aspect 15 above, in which, in the step of calculating the orientation coefficient, the orientation coefficient is calculated by substituting the information acquired in the acquisition step and the tensile modulus into a Cox-Krenchel model.

[0101] According to the above aspect, by using the orientation coefficient calculated using the Cox-Krenchel model, a molded body made of a composite material can be more easily analyzed.

[0102] The evaluation method according to aspect 18 of the present invention is the evaluation method according to any one of aspects 13 to 17 above, wherein the information indicating the mechanical properties of the short fibers includes at least one of the volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average inter-fiber distance in the molded body of the short fibers.

[0103] According to the above aspect, by using at least one of the short fiber volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average inter-fiber distance in the molded body, it is possible to more accurately analyze a molded body formed using a mixed material.

[0104] The evaluation method according to a nineteenth aspect of the present invention is the evaluation method according to any one of the thirteenth to eighteenth aspects, wherein the information indicating the mechanical properties of the matrix resin includes at least one of the tensile modulus of the matrix resin, the shear modulus of the matrix resin, and the volume content.

[0105] According to the above aspect, by using at least one of the tensile modulus of the matrix resin, the shear modulus of the matrix resin, and the volume content, information indicating the mechanical properties of the matrix resin can be used to more accurately analyze a molded body formed using a mixed material.

[0106] The evaluation method of aspect 20 of the present invention is the evaluation method described in aspect 14 above, wherein the parameters for analyzing the molded body further include at least one of the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat.

[0107] According to the above aspect, by using at least one of the parameters for analyzing a molded body, which are the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat, the molded body can be analyzed with higher accuracy.

[0108] An evaluation method according to aspect 21 of the present invention is an evaluation method according to any one of aspects 13 to 20 above, wherein the information representing the shape of the molded body includes at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, circularity, cylindricity, coaxiality, concentricity, and profile of the molded body.

[0109] According to the above aspect, the molded body can be analyzed more accurately by using at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, circularity, cylindricity, coaxiality, concentricity, and profile of the molded body.

[0110] An evaluation method according to a twenty-second aspect of the present invention is the evaluation method according to any one of the thirteenth to twenty-first aspects, wherein the short fibers include at least one of carbon fibers, aramid fibers, acrylic fibers, metal fibers, and glass fibers.

[0111] According to the above aspect, it is possible to more easily analyze a molded body made of a composite material including at least one of carbon fiber, aramid fiber, acrylic fiber, metal fiber, and glass fiber.

[0112] The evaluation method according to a twenty-third aspect of the present invention is the evaluation method according to any one of the thirteenth to twenty-second aspects, wherein the matrix resin is a thermoplastic resin.

[0113] According to the above aspect, a molded article made of a composite material containing a thermoplastic resin can be more easily analyzed.

[0114] The evaluation method according to a 24th aspect of the present invention is the evaluation method according to the 23rd aspect, wherein the thermoplastic resin includes at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide.

[0115] According to the above aspect, it is possible to more easily analyze molded objects made from composite materials including at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide.

[0116] In addition, the evaluation program of aspect 25 of the present invention is an evaluation program for causing a computer to function as an evaluation device for evaluating the mechanical properties of a molded body formed by a 3D printer using a composite material containing short fibers and a matrix resin, and causes the computer to function as an acquisition unit that acquires information indicating the mechanical properties of the short fibers and the tensile modulus of the composite material, and an output unit that outputs analysis results of the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit.

[0117] According to the above aspect, a molded article made of a composite material containing short fibers can be more easily analyzed.

[0118] The evaluation program of aspect 26 of the present invention, in the evaluation program described in aspect 25 above, further causes the computer to function as a molded body analysis parameter calculation unit that calculates molded body analysis parameters including tensile elastic modulus and shear elastic modulus in one or more directions of the composite material based on an orientation coefficient representing the fiber orientation of the molded body, and the output unit outputs the analysis results of analyzing the molded body further using the molded body analysis parameters calculated by the molded body analysis parameter calculation unit.

[0119] According to the above aspect, by using the molded body analysis parameters calculated using the orientation coefficient, a molded body made of a composite material containing short fibers can be more easily analyzed.

[0120] The evaluation program of aspect 27 of the present invention, in the evaluation program described in aspect 26 above, further causes the computer to function as an orientation coefficient calculation unit that calculates an orientation coefficient representing the fiber orientation of the molded body using information acquired by the acquisition unit and a model representing the relationship between the information and the orientation coefficient of the composite material.

[0121] According to the above aspect, by using an orientation coefficient calculated using information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin, it is possible to calculate molded body analysis parameters for analyzing the molded body.

[0122] An evaluation program according to aspect 28 of the present invention is the evaluation program described in aspect 27 above, wherein the parameter calculation unit for molding analysis generates a homogenization method model that simulates the fiber orientation of the composite material by a homogenization method using the orientation coefficients calculated by the orientation coefficient calculation unit, and calculates the parameters for molding analysis using the generated homogenization method model.

[0123] According to the above aspect, by using an equalization method model generated using an orientation coefficient calculated from information indicating the mechanical properties of the short fibers and information indicating the mechanical properties of the matrix resin, it is possible to more easily analyze molded bodies made from composite materials.

[0124] An evaluation program according to aspect 29 of the present invention is the evaluation program described in aspect 27 above, wherein the orientation coefficient calculation unit calculates the orientation coefficient by substituting the information acquired by the acquisition unit and the tensile modulus into a Cox-Krenchel model.

[0125] According to the above aspect, by using the orientation coefficient calculated using the Cox-Krenchel model, a molded body made of a composite material can be more easily analyzed.

[0126] An evaluation program according to aspect 30 of the present invention is the evaluation program according to any one of aspects 25 to 29 above, wherein the information indicating the mechanical properties of the short fibers includes at least one of the volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average inter-fiber distance in the molded body of the short fibers.

[0127] According to the above aspect, by using at least one of the short fiber volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average inter-fiber distance in the molded body, it is possible to more accurately analyze a molded body formed using a mixed material.

[0128] An evaluation program according to aspect 31 of the present invention is the evaluation program according to any one of aspects 25 to 30 above, wherein the information indicating the mechanical properties of the matrix resin includes at least one of the tensile modulus of the matrix resin, the shear modulus of the matrix resin, and the volume content.

[0129] According to the above aspect, by using at least one of the tensile modulus of the matrix resin, the shear modulus of the matrix resin, and the volume content, information indicating the mechanical properties of the matrix resin can be used to more accurately analyze a molded body formed using a mixed material.

[0130] In the evaluation program described in the above-mentioned aspect 32, the parameters for molding analysis further include at least one of the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat.

[0131] According to the above aspect, by using at least one of the parameters for analyzing a molded body, which are the Poisson's ratio in one or more directions of the composite material, the linear expansion coefficient in one or more directions of the composite material, the thermal conductivity, the density, and the specific heat, the molded body can be analyzed with higher accuracy.

[0132] An evaluation program according to aspect 33 of the present invention is an evaluation program according to any one of aspects 25 to 32 above, wherein the information representing the shape of the molded body includes at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, circularity, cylindricity, coaxiality, concentricity, and profile of the molded body.

[0133] According to the above aspect, the molded body can be analyzed more accurately by using at least one of the long dimension, short dimension, height dimension, thickness dimension, diameter, circularity, cylindricity, coaxiality, concentricity, and profile of the molded body.

[0134] An evaluation program according to a thirty-fourth aspect of the present invention is the evaluation program according to any one of the twenty-fifth to thirty-third aspects, wherein the short fibers include at least one of carbon fibers, aramid fibers, acrylic fibers, metal fibers, and glass fibers.

[0135] According to the above aspect, it is possible to more easily analyze a molded body made of a composite material including at least one of carbon fiber, aramid fiber, acrylic fiber, metal fiber, and glass fiber.

[0136] The evaluation program according to a thirty-fifth aspect of the present invention is the evaluation program according to any one of the twenty-fifth to thirty-fourth aspects, wherein the matrix resin is a thermoplastic resin.

[0137] According to the above aspect, a molded article made of a composite material containing a thermoplastic resin can be more easily analyzed.

[0138] An evaluation program according to a thirty-sixth aspect of the present invention is the evaluation program described in the thirty-fifth aspect, wherein the thermoplastic resin includes at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide.

[0139] According to the above aspect, it is possible to more easily analyze molded objects made from composite materials including at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide. [Explanation of symbols]

[0140] 1. Evaluation device 10 Control section 11 Acquisition Department 12 Orientation coefficient calculation section 13. Parameter calculation section for molding analysis 14 Analysis Department 15 Output control section 20 Memory section 30 Communications Department 40 Input section 50 Output section

Claims

1. An evaluation system for evaluating mechanical properties of a molded body formed by a three-dimensional printer using a composite material containing short fibers and a matrix resin, comprising: an acquisition unit that acquires information indicating mechanical properties of the short fibers, information indicating mechanical properties of the matrix resin, information indicating a shape of the molded body, and a tensile modulus of the composite material; an output unit that outputs an analysis result obtained by analyzing the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit; An evaluation system comprising:

2. A molded body analysis parameter calculation unit that calculates molded body analysis parameters including a tensile modulus and a shear modulus in one or more directions of the composite material based on an orientation coefficient representing the fiber orientation of the molded body, The output unit outputs an analysis result obtained by analyzing the molded body by further using the molded body analysis parameters calculated by the molded body analysis parameter calculation unit. The evaluation system according to claim 1 .

3. Further provided is an orientation coefficient calculation unit that calculates an orientation coefficient representing the fiber orientation of the molded body using the information acquired by the acquisition unit and a model representing the relationship between the information and the orientation coefficient of the composite material; The evaluation system according to claim 2 .

4. the molded body analysis parameter calculation unit generates a homogenization method model that simulates the fiber orientation of the composite material by a homogenization method using the orientation coefficient calculated by the orientation coefficient calculation unit, and calculates the molded body analysis parameters using the generated homogenization method model. The evaluation system according to claim 3 .

5. The orientation coefficient calculation unit calculates the orientation coefficient by substituting the information acquired by the acquisition unit and the tensile elastic modulus into a Cox-Krenchel model. The evaluation system according to claim 3 .

6. The information indicating the mechanical properties of the short fibers includes at least one of the volume content, tensile modulus, fiber length, fiber diameter, fiber radius, and average value of inter-fiber distance in the molded body of the short fibers. The evaluation system according to claim 1 or 2.

7. The information indicating the mechanical properties of the matrix resin includes at least one of a tensile modulus of the matrix resin, a shear modulus of the matrix resin, and a volume content of the matrix resin. The evaluation system according to claim 1 or 2.

8. The molded body analysis parameters further include at least one of a Poisson's ratio in one or more directions of the composite material, a linear expansion coefficient in one or more directions of the composite material, a thermal conductivity, a density, and a specific heat. The evaluation system according to claim 2 .

9. The information representing the shape of the molded body includes at least one of a long dimension, a short dimension, a height dimension, a thickness dimension, a diameter, a roundness, a cylindricity, a coaxiality, a concentricity, and a contour degree of the molded body. The evaluation system according to claim 1 or 2.

10. The short fibers include at least one of carbon fibers, aramid fibers, acrylic fibers, metal fibers, and glass fibers. The evaluation system according to claim 1 or 2.

11. The matrix resin is a thermoplastic resin. The evaluation system according to claim 1 or 2.

12. The thermoplastic resin includes at least one of polycarbonate, ABS, ASA, polylactic acid, PETG, TPU, polystyrene, nylon, acrylic, PEEK, polyolefin, and polyamide; The evaluation system of claim 11.

13. A method for evaluating mechanical properties of a molded body produced by a three-dimensional printer using a composite material containing short fibers and a matrix resin, comprising: acquiring information indicating mechanical properties of the short fibers, information indicating mechanical properties of the matrix resin, information indicating the shape of the molded body, and the tensile modulus of the composite material; outputting an analysis result of the mechanical properties of the molded body using information indicating the mechanical properties of the short fibers, information indicating the mechanical properties of the matrix resin, information indicating the shape of the molded body, and the tensile modulus of the composite material; Evaluation methods including:

14. An evaluation program for causing a computer to function as an evaluation device for evaluating mechanical properties of a molded body formed by a three-dimensional printer using a composite material containing short fibers and a matrix resin, comprising: an acquisition unit that acquires information indicating the mechanical properties of the short fibers and the tensile modulus of the composite material; an output unit that outputs an analysis result obtained by analyzing the mechanical properties of the molded body using the information and tensile modulus acquired by the acquisition unit; Evaluation program to function as.

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