Testing method, device, equipment and medium for tensile strength of carbon fiber multifilament

Abstract

The present invention discloses a method, device, equipment and medium for testing the tensile strength of carbon fiber multifilaments. The method comprises testing the tensile strength of non-glue yarn and dipped yarn carbon fiber multifilaments respectively to obtain a first tensile strength and a second tensile strength; obtaining a linear relationship between the first tensile strength and the second tensile strength; adjusting the process parameters of the carbon fiber multifilaments, and using the carbon fiber multifilaments obtained after the process parameters are adjusted as the carbon fiber multifilaments to be tested, and performing a tensile strength test to obtain a third tensile strength; based on the third tensile strength and the linear relationship, obtaining a fourth tensile strength of the carbon fiber multifilaments to be tested. The present invention calculates the tensile strength of the dipped yarn multifilaments of the adjusted process through the obtained linear relationship between the tensile strengths of the non-glue yarn and the dipped yarn multifilaments, significantly shortens the test time of the tensile strength of the dipped yarn multifilaments, improves the test efficiency, increases the process adjustment efficiency, and promotes production.

Description

Technical Field

[0001] The invention relates to the technical field of composite material performance testing, and in particular to a testing method, device, equipment and medium for tensile strength of carbon fiber multifilaments. Background Art

[0002] Carbon fiber is a new type of high-strength, high-modulus material with a carbon content of more than 95%. The tensile properties of carbon fiber multifilament are the key indicators for evaluating the performance of carbon fiber and are also the core parameters for structural design. Therefore, the test of the tensile properties of carbon fiber multifilament is particularly important. Summary of the invention

[0003] In view of the above problems, the embodiments of the present application provide a method, device, equipment and medium for testing the tensile strength of carbon fiber multifilaments, so as to test the tensile properties of carbon fiber multifilaments and guide the adjustment of carbon fiber processes.

[0004] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0005] A first aspect of an embodiment of the present application provides a method for testing the tensile strength of a carbon fiber multifilament, comprising:

[0006] Conducting a tensile strength test on the non-glue yarn carbon fiber multifilament to obtain a first tensile strength;

[0007] Conducting a tensile strength test on the dipped yarn carbon fiber multifilament to obtain a second tensile strength;

[0008] Obtaining a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength;

[0009] Adjusting the process parameters of the carbon fiber multifilament, and using the carbon fiber multifilament obtained after the process parameters are adjusted as the carbon fiber multifilament to be tested;

[0010] Performing a tensile strength test on the carbon fiber multifilament to be tested to obtain a third tensile strength;

[0011] Based on the third tensile strength and the linear relationship, a fourth tensile strength of the carbon fiber multifilament to be tested is obtained, and the fourth tensile strength is used to characterize the predicted tensile strength of the carbon fiber multifilament to be tested after being dipped in resin.

[0012] Optionally, obtaining a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength comprises:

[0013] Taking the first tensile strength as an independent variable and the second tensile strength as a dependent variable, a linear relationship model is established;

[0014] The data of the first tensile strength and the second tensile strength are substituted into the linear relationship model to fit the linear relationship between the first tensile strength and the second tensile strength.

[0015] Optionally, the tensile strength of the unbonded carbon fiber multifilament is tested, comprising:

[0016] The unbonded carbon fiber multifilament is clamped on a fixture for testing, wherein the fixture comprises an upper fixture and a lower fixture;

[0017] The unbonded carbon fiber multifilament is clamped in the upper clamp and the lower clamp in an S-shape.

[0018] Optionally, clamping the unbonded carbon fiber multifilament in the upper fixture and the lower fixture in an S-shape comprises:

[0019] Clamping one end of the unbonded carbon fiber multifilament into the upper clamp;

[0020] Controlling the opening and closing of the clamp, applying tension at the other end, so that the unbonded carbon fiber multifilament is straightened axially and clamped into the lower clamp;

[0021] Wherein, the distance between the end surface of the upper clamp and the end surface of the lower clamp is 100mm-300mm.

[0022] Optionally, the step of clamping the unbonded carbon fiber multifilament on a fixture for testing comprises:

[0023] The tensile strength of the unbonded carbon fiber multifilament is tested using a tensile testing machine, wherein the load of the tensile testing machine is 1KN-5KN;

[0024] The stretching speed is 1 mm / min-100 mm / min.

[0025] Optionally, the testing method further includes:

[0026] When the tensile strength of the non-glue yarn carbon fiber multifilament is tested, the failure form of the non-glue yarn carbon fiber multifilament is recorded;

[0027] The damage forms include effective fracture and invalid fracture. The invalid fracture includes slipping of the unbonded carbon fiber multifilament, fracture of the unbonded carbon fiber multifilament in the fixture, and fracture of the unbonded carbon fiber multifilament within 5 mm from the end face of the fixture.

[0028] Optionally, the testing method comprises:

[0029] The tensile strength test is carried out on the non-glue yarn carbon fiber multifilament and the dipped yarn carbon fiber multifilament of the same model but different axis.

[0030] A second aspect of the embodiment of the present application provides a testing device for tensile strength of carbon fiber multifilament, comprising:

[0031] A first tensile strength testing module is used to perform a tensile strength test on the unbonded carbon fiber multifilament to obtain a first tensile strength;

[0032] A second tensile strength testing module is used to perform a tensile strength test on the dipped yarn carbon fiber multifilament to obtain a second tensile strength;

[0033] A linear relationship acquisition module, configured to acquire a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength;

[0034] A process parameter adjustment module is used to adjust the process parameters of the carbon fiber multifilament, and use the carbon fiber multifilament obtained after the process parameter adjustment as the carbon fiber multifilament to be tested;

[0035] A third tensile strength testing module is used to perform a tensile strength test on the carbon fiber multifilament to be tested to obtain a third tensile strength;

[0036] A fourth tensile strength acquisition module is used to obtain a fourth tensile strength of the carbon fiber multifilament to be tested based on the third tensile strength and the linear relationship, wherein the fourth tensile strength is used to characterize the predicted tensile strength of the carbon fiber multifilament to be tested after being dipped in resin.

[0037] A third aspect of an embodiment of the present application provides a computer device, comprising:

[0038] processor;

[0039] a memory for storing processor-executable instructions;

[0040] Wherein, the processor is configured to execute the testing method for the tensile strength of carbon fiber multifilament as described in the first aspect.

[0041] A fourth aspect of the embodiments of the present application provides a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by a processor, it enables the processor to perform the method for testing the tensile strength of carbon fiber multifilament as described in the first aspect.

[0042] Beneficial effects:

[0043] The present invention obtains the tensile strength of non-glue yarn and dipped yarn carbon fiber multifilaments through testing, and obtains the relationship model of the tensile strength of non-glue yarn and dipped yarn multifilaments by fitting, thereby calculating the tensile strength of the dipped yarn multifilament after the adjustment process, and can quickly obtain the tensile strength of the dipped yarn carbon fiber multifilament, significantly shortening the time for testing the tensile strength of the dipped yarn multifilament, thereby guiding production, improving testing efficiency, and increasing process adjustment efficiency. The method is efficient, easy to operate, and promotes production. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 Flow chart of the tensile strength testing method in an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a fixture structure in an embodiment of the present invention;

[0047] Figure 3 is a block diagram of a tensile strength testing device in an embodiment of the present invention;

[0048] Figure 4 Schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0050] GB / T31290-2014 "Determination of tensile properties of carbon fiber monofilaments" and GB / T3362-2017 "Test method for tensile properties of carbon fiber multifilaments" respectively stipulate the test methods for the tensile properties of carbon fiber monofilaments and multifilaments. The tensile properties of carbon fiber monofilaments usually require testing more than 40 monofilaments for one axis of multifilaments, the test volume is large and the results are highly discrete; the sample preparation and testing cycle of the tensile properties of carbon fiber multifilaments is long. Generally, it takes more than 5 hours to complete the test of one axis of multifilaments, which cannot guide the process adjustment in time.

[0051] The test results of carbon fiber filament tensile properties in GB / T19975-2005 "Test Method for Tensile Properties of High-Reinforced Filament" have poor stability and poor correlation with the tensile properties of carbon fiber dipped yarn multifilament, and cannot be used as a reference for carbon fiber process adjustment.

[0052] Therefore, in order to solve the problem of testing the tensile properties of carbon fiber multifilaments, the present invention provides a method for testing the tensile strength of carbon fiber multifilaments, which is used to guide the adjustment of the carbon fiber process.

[0053] The present invention discloses a method for testing the tensile strength of carbon fiber multifilaments. Figure 1 As shown, the method comprises the following steps:

[0054] S101, performing a tensile strength test on the unbonded carbon fiber multifilament to obtain a first tensile strength.

[0055] The unbonded carbon fiber multifilament is clamped in an "S" shape and clamped in a special fixture of a tensile testing machine for tensile strength testing. No preliminary processing is required, and there is a program set on the tensile testing machine. When the unbonded carbon fiber multifilament is tested, the first tensile strength of the unbonded carbon fiber multifilament can be directly obtained and read. The time for testing a group of unbonded carbon fiber multifilament samples is about 3min-4min.

[0056] S102, performing a tensile strength test on the dipped yarn carbon fiber multifilament to obtain a second tensile strength.

[0057] When testing the tensile strength of the dipped yarn carbon fiber multifilament, the carbon fiber needs to be wound and sampled, dipped, cured, reinforced, secondary cured, trimmed, and finally the tensile strength of the dipped yarn carbon fiber multifilament is tested according to the GB / T3362-2017 method. The whole process is not less than 5 hours.

[0058] S103, obtaining a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength.

[0059] By testing the tensile strength of the unbonded carbon fiber multifilament, the first tensile strength data is obtained, and by testing the tensile strength of the dipped carbon fiber multifilament, the second tensile strength data is obtained. 10-20 groups of tensile strength data, or even more groups of data, are tested. The tensile strength data obtained are fitted by some tools in the prior art to obtain a linear relationship between the first tensile strength and the second tensile strength. The linear relationship is obvious, and the correlation coefficient R 2 ≥0.95.

[0060] S104, adjusting the process parameters of the carbon fiber multifilament, and using the carbon fiber multifilament obtained after the process parameters are adjusted as the carbon fiber multifilament to be tested.

[0061] The process parameters of the carbon fiber multifilament, such as the oxycarbonization process, tension, and temperature, are adjusted so as to test the carbon fiber multifilament after the process parameters are adjusted. The tensile strength test of the dipped yarn carbon fiber multifilament requires the steps of carbon fiber multifilament winding and sample preparation, dipped yarn, solidified, reinforced sheet pasted, secondary solidified, trimmed, and finally tested. The whole process takes no less than 5 hours. When the tensile strength test of the non-glue yarn carbon fiber multifilament is carried out, the carbon fiber multifilament can be directly clamped on the fixture for testing, and no processing is required in the early stage. Therefore, the carbon fiber multifilament after the process parameters are adjusted at this time, that is, the carbon fiber multifilament to be tested is the non-glue yarn carbon fiber multifilament.

[0062] S105, performing a tensile strength test on the carbon fiber multifilament to be tested to obtain a third tensile strength.

[0063] The carbon fiber multifilament to be tested is the carbon fiber multifilament after adjusting the process parameters such as oxycarbonization process, tension, temperature, etc. The non-glue yarn carbon fiber multifilament after adjusting the process parameters is directly clamped in an "S" shape on a special fixture of a tensile testing machine for testing. There is a program set on the tensile testing machine to directly obtain and read the third tensile strength of the non-glue yarn carbon fiber multifilament after adjusting the process parameters.

[0064] S106, based on the third tensile strength and the linear relationship, obtaining a fourth tensile strength of the carbon fiber multifilament to be tested, wherein the fourth tensile strength is used to characterize the predicted tensile strength of the carbon fiber multifilament to be tested after being dipped in resin.

[0065] The linear relationship obtained by fitting the first tensile strength of the unbonded yarn carbon fiber multifilament and the second tensile strength of the dipped yarn carbon fiber multifilament is substituted into the linear relationship by adjusting the process parameters of the unbonded yarn carbon fiber multifilament to be tested, so that the fourth tensile strength of the carbon fiber multifilament to be tested can be directly calculated. The fourth tensile strength is the predicted tensile strength of the carbon fiber multifilament to be tested after dipping. The tensile strength of the dipped yarn carbon fiber multifilament to be tested after adjusting the process parameters is calculated by the obtained linear relationship, and then the adjustment status of the production line and the product performance are judged according to the tensile strength of the dipped yarn carbon fiber multifilament after adjusting the process parameters.

[0066] The present invention provides a method for testing the tensile strength of carbon fiber multifilaments. The method obtains the tensile strength of non-glue yarn and dipped yarn carbon fiber multifilaments through testing, and obtains a relationship model of the tensile strength of non-glue yarn and dipped yarn multifilaments by fitting, thereby calculating the tensile strength of the dipped yarn multifilaments after the process is adjusted. The method significantly shortens the time for testing the tensile strength of the dipped yarn multifilaments, improves the testing efficiency, and increases the process adjustment efficiency. The method can be used to guide the adjustment of the carbon fiber process and promote production.

[0067] As an optional embodiment of the present invention, obtaining a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength includes:

[0068] A linear relationship model was established with the first tensile strength as the independent variable and the second tensile strength as the dependent variable;

[0069] The data of the first tensile strength and the second tensile strength are substituted into the linear relationship model to fit the linear relationship between the first tensile strength and the second tensile strength.

[0070] A linear relationship model of the tensile strength of non-glue yarn and dipped yarn carbon fiber multifilament was established, wherein the first tensile strength obtained by testing the non-glue yarn carbon fiber multifilament was used as the independent variable, and the second tensile strength obtained by testing the dipped yarn carbon fiber multifilament was used as the dependent variable. Multiple groups of test data were substituted into the established linear relationship model, and a linear relationship between the first tensile strength and the second tensile strength was fitted. There was an obvious linear relationship, and its correlation coefficient R 2 Not less than 0.95, the linear relationship between the first tensile strength and the second tensile strength is enhanced, and its accuracy and reliability are increased. In other words, only when the correlation coefficient R 2 When the correlation coefficient R is greater than or equal to 0.95, it can be said that there is an obvious linear relationship between the first tensile strength and the second tensile strength. 2 If it is lower than 0.95, it means that the relationship between the first tensile strength and the second tensile strength is not a linear relationship. In this case, the process of carbon fiber multifilament should be adjusted to make a more obvious linear relationship between the two. Only then can the linear model between the un-gelled yarn and the dipped yarn carbon fiber multifilament be considered to be established.

[0071] As an optional embodiment of the present invention, Figure 2 As shown, the tensile strength of the unbonded carbon fiber multifilament is tested, including:

[0072] The unbonded carbon fiber multifilament is clamped on a fixture for testing, and the fixture includes an upper fixture 1 and a lower fixture 2;

[0073] The unbonded carbon fiber multifilament is clamped in an S-shape between the upper clamp 1 and the lower clamp 2 .

[0074] When the tensile strength test of the non-glue yarn carbon fiber multifilament is carried out, the clamp used is a special clamp, which can firmly clamp the non-glue yarn carbon fiber multifilament without slipping. The special clamp for the tensile strength test of the non-glue yarn carbon fiber multifilament includes an upper clamp 1 and a lower clamp 2, and the upper clamp 1 is equipped with an upper support area 3 and an upper clamping surface area 5, and the lower clamp 2 is equipped with a lower support area 4 and a lower clamping surface area 6, and the non-glue yarn carbon fiber multifilament 7 is clamped in the upper clamp 1 and the lower clamp 2 in an "S" shape.

[0075] As an optional embodiment of the present invention, the unbonded carbon fiber multifilament is clamped in an S-shape in an upper clamp 1 and a lower clamp 2, including: clamping one end of the unbonded carbon fiber multifilament into the upper clamp 1;

[0076] Control the opening and closing of the clamp, apply tension at the other end, and straighten the non-glue carbon fiber multifilament along the axial direction and clamp it into the lower clamp 2;

[0077] The distance between the end surface of the upper clamp 1 and the end surface of the lower clamp 2 is 100 mm-300 mm.

[0078] When the tensile strength test of the unbonded carbon fiber multifilament is carried out, the unbonded carbon fiber multifilament 7 is clamped in an "S" shape in the upper clamp 1 and the lower clamp 2, and one end of the unbonded carbon fiber multifilament is clamped in the upper clamp 1. The opening and closing of the clamp is controlled pneumatically, and tension is applied to the other end to straighten the unbonded carbon fiber multifilament axially and clamp it into the lower clamp 2; wherein, the spacing between the end face of the upper clamp 1 and the end face of the lower clamp 2 is 100mm-300mm.

[0079] As an optional embodiment of the present invention, the unbonded carbon fiber multifilament is clamped on a fixture for testing, including:

[0080] The tensile strength of the unbonded carbon fiber multifilament was tested using a tensile testing machine with a load of 1KN-5KN and a tensile speed of 1 mm / min-100mm / min.

[0081] The maximum load of the tensile testing machine is 5KN, generally between 1KN-5KN, to test the tensile strength of the unbonded carbon fiber multifilament, and the tensile speed is between 1 mm / min-100mm / min.

[0082] When the tensile strength of the unbonded carbon fiber multifilament is tested, the opening and closing of the clamp is controlled pneumatically, so that the pressure of the clamp controlled by the pneumatic method of the tensile testing machine is controlled at 0.4 MPa-0.6 MPa.

[0083] As an optional embodiment of the present invention, the testing method further includes:

[0084] When the tensile strength test of the non-glue carbon fiber multifilament is carried out, the failure form of the non-glue carbon fiber multifilament is recorded.

[0085] Among them, the failure forms include effective fracture and invalid fracture. Invalid fracture includes slipping of unbonded carbon fiber multifilament, fracture of unbonded carbon fiber multifilament in the fixture, and fracture of unbonded carbon fiber multifilament within 5 mm from the end face of the fixture.

[0086] As an optional embodiment of the present invention, the testing method comprises:

[0087] The tensile strength test was carried out on the non-glue yarn carbon fiber multifilament and the dipped yarn carbon fiber multifilament of the same model but different axis.

[0088] The same model refers to the model of carbon fiber multifilaments, and different models of carbon fiber multifilaments contain different numbers of carbon fiber filaments. When testing the carbon fiber multifilaments, the present disclosure ensures that the un-glue yarn carbon fiber multifilaments and the dipped yarn carbon fiber multifilaments are of the same model, and the carbon fiber multifilaments on the production line must have multiple racks, corresponding to multiple shafts, for example, each shaft has 2.5 kg of carbon fiber multifilaments, and the carbon fiber multifilaments between different shafts will have fluctuations in tensile strength.

[0089] The present invention provides a method for testing the tensile strength of carbon fiber multifilaments. The method obtains the tensile strengths of non-glue yarn and dipped yarn carbon fiber multifilaments through testing, establishes a relationship model between the tensile strengths of non-glue yarn and dipped yarn multifilaments, and during production start-up or process optimization, the tensile strength of dipped yarn carbon fiber multifilaments is inferred based on the test value of the tensile strength of the non-glue yarn carbon fiber multifilaments. The test time is shortened by about 75 times, which significantly shortens the time for testing the tensile strength of the dipped yarn multifilaments, improves the test efficiency, increases the process adjustment efficiency, and can be used to guide the adjustment of the carbon fiber process, thereby promoting production.

[0090] As an optional embodiment, before adjusting the process, the tensile strength of the carbon fiber multifilaments of the un-glue yarn and the glue-impregnated yarn is tested first, wherein the tensile strength test process of the un-glue yarn carbon fiber multifilament is as follows: the fiber to be tested is clamped in an "S" shape in the upper clamp 1 and the lower clamp 2. When clamping the carbon fiber multifilament, one end of the carbon fiber is first added to the upper clamp 1, and tension is applied to the other end to ensure that the carbon fiber multifilament sample is straightened along the axial direction and clamped into the lower clamp 2.

[0091] When conducting the tensile strength test of the unbonded yarn carbon fiber multifilament, the maximum load of the tensile testing machine used was 5KN, the distance between the upper fixture end face and the lower fixture end face was 100mm, the tensile speed was 5mm / min, and the air pressure was controlled at 0.4MPa; the tensile strength of the dipped yarn carbon fiber multifilament was tested according to the GB / T3362-2017 method.

[0092] According to the tensile strength of the tested carbon fiber multifilaments of unbonded yarn and dipped yarn, the linear relationship between the tensile strength of the unbonded yarn carbon fiber multifilament and the tensile strength of the dipped yarn carbon fiber multifilament is calculated to be y=2.14x+14.7, where y is the tensile strength of the dipped yarn carbon fiber multifilament, x is the tensile strength of the unbonded yarn carbon fiber multifilament, and the correlation coefficient R 2 is 0.99.

[0093] After adjusting the process, the carbon fiber multifilament after the adjustment process is taken for tensile strength test of the unbonded yarn, and the measured tensile strength of the unbonded yarn carbon fiber multifilament is substituted into the calculated linear relationship y=2.14x+14.7, and the tensile strength of the dipped yarn carbon fiber multifilament after the adjustment process can be obtained, thereby judging the degree of process adjustment or product performance.

[0094] As another optional embodiment, before adjusting the process, the tensile strength of the carbon fiber multifilaments of the un-glue yarn and the glue-impregnated yarn is tested first, wherein the tensile strength test process of the un-glue yarn carbon fiber multifilament is as follows: the fiber to be tested is clamped in an "S" shape in the upper clamp 1 and the lower clamp 2. When clamping the carbon fiber multifilament, one end of the carbon fiber is first added to the upper clamp 1, and tension is applied to the other end to ensure that the carbon fiber multifilament sample is straightened axially and clamped into the lower clamp 2.

[0095] When conducting the tensile strength test of the unbonded carbon fiber multifilament, the maximum load of the tensile testing machine used was 5KN, the distance between the upper clamp end face and the lower clamp end face was 250mm, the tensile speed was 20mm / min, and the air pressure was controlled at 0.6MPa; the tensile strength of the dipped carbon fiber multifilament was tested according to the GB / T3362-2017 method.

[0096] According to the tensile strength of the tested carbon fiber multifilaments of unbonded yarn and dipped yarn, the linear relationship between the tensile strength of the unbonded yarn carbon fiber multifilament and the tensile strength of the dipped yarn carbon fiber multifilament is calculated to be y=2.18x+12.1, where y is the tensile strength of the dipped yarn carbon fiber multifilament, x is the tensile strength of the unbonded yarn carbon fiber multifilament, and the correlation coefficient R 2 It is 0.98.

[0097] After adjusting the process, the carbon fiber multifilament after the adjustment process is taken for tensile strength test of the unbonded yarn, and the measured tensile strength of the unbonded yarn drawn carbon fiber multifilament is substituted into the calculated linear relationship y=2.18x+12.1, and the tensile strength of the dipped yarn carbon fiber multifilament after the adjustment process can be obtained, thereby judging the degree of process adjustment or product performance.

[0098] The present invention also discloses a device for testing the tensile strength of carbon fiber multifilaments. Figure 3 As shown, the device comprises:

[0099] The first tensile strength testing module 301 is used to perform a tensile strength test on the unbonded carbon fiber multifilament to obtain a first tensile strength.

[0100] The second tensile strength testing module 302 is used to perform a tensile strength test on the dipped yarn carbon fiber multifilament to obtain a second tensile strength.

[0101] The linear relationship acquisition module 303 is used to obtain the linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength.

[0102] A process parameter adjustment module 304 is used to adjust the process parameters of the carbon fiber multifilament and use the carbon fiber multifilament obtained after the process parameter adjustment as the carbon fiber multifilament to be tested;

[0103] A third tensile strength testing module 305 is used to perform a tensile strength test on the carbon fiber multifilament to be tested to obtain a third tensile strength;

[0104] The fourth tensile strength acquisition module 306 is used to obtain the fourth tensile strength of the carbon fiber multifilament to be tested based on the third tensile strength and the linear relationship, and the fourth tensile strength is used to characterize the predicted tensile strength of the carbon fiber multifilament to be tested after being dipped in resin.

[0105] The testing device for the tensile strength of carbon fiber multifilaments provided by the present invention obtains the tensile strength of non-glue yarn and dipped yarn carbon fiber multifilaments through testing, and obtains the relationship model of the tensile strength of non-glue yarn and dipped yarn multifilaments by fitting, thereby calculating the tensile strength of the dipped yarn multifilament after the process is adjusted, which significantly shortens the time for testing the tensile strength of the dipped yarn multifilaments, improves the testing efficiency, and increases the process adjustment efficiency, and can be used to guide the adjustment of the carbon fiber process and promote production.

[0106] The embodiment of the present invention also provides a computer device, such as Figure 4 As shown, the electronic device may include a processor 401 and a memory 402, wherein the processor 401 and the memory 402 may be connected via a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0107] The processor 401 may be a central processing unit (CPU). The processor 401 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0108] The memory 402 is a non-transient computer-readable storage medium that can be used to store non-transient software programs, non-transient computer executable programs and modules, such as program instructions / modules corresponding to the illegal behavior detection method in the embodiment of the present invention. The processor 401 executes various functional applications and data processing of the processor by running the non-transient software programs, instructions and modules stored in the memory 402, that is, the test method for the tensile strength of carbon fiber multifilament in the above method embodiment is realized.

[0109] The memory 402 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created by the processor 401, etc. In addition, the memory 402 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 402 may optionally include a memory remotely arranged relative to the processor 401, and these remote memories may be connected to the processor 401 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0110] The one or more modules are stored in the memory 402, and when executed by the processor 401, the following is performed: Figure 1 The test method of the tensile strength of the carbon fiber multifilament in the illustrated embodiment.

[0111] For details of the above electronic equipment, please refer to Figure 1 The corresponding related descriptions and effects in the illustrated embodiments can be understood and will not be repeated here.

[0112] Those skilled in the art can understand that the implementation of all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0113] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0114] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for testing the tensile strength of carbon fiber multifilament, characterized in that: The tensile strength test is performed on non-glue yarn carbon fiber multifilament and dipped yarn carbon fiber multifilament of the same model but different axis, and the method comprises: Conducting a tensile strength test on the non-glue yarn carbon fiber multifilament to obtain a first tensile strength; Conducting a tensile strength test on the dipped yarn carbon fiber multifilament to obtain a second tensile strength; Obtaining a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength; Adjusting the process parameters of the carbon fiber multifilament, and using the carbon fiber multifilament obtained after the process parameters are adjusted as the carbon fiber multifilament to be tested; Performing a tensile strength test on the carbon fiber multifilament to be tested to obtain a third tensile strength; Based on the third tensile strength and the linear relationship, a fourth tensile strength of the carbon fiber multifilament to be tested is obtained, and the fourth tensile strength is used to characterize the predicted tensile strength of the carbon fiber multifilament to be tested after being dipped in resin.

2. The method for testing the tensile strength of carbon fiber multifilament according to claim 1, characterized in that: The step of obtaining a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength comprises: Taking the first tensile strength as an independent variable and the second tensile strength as a dependent variable, a linear relationship model is established; The data of the first tensile strength and the second tensile strength are substituted into the linear relationship model to fit the linear relationship between the first tensile strength and the second tensile strength.

3. The method for testing the tensile strength of carbon fiber multifilament according to claim 1, characterized in that: The tensile strength of the unbonded carbon fiber multifilament is tested, comprising: The unbonded carbon fiber multifilament is clamped on a fixture for testing, wherein the fixture comprises an upper fixture and a lower fixture; The unbonded carbon fiber multifilament is clamped in the upper clamp and the lower clamp in an S-shape.

4. The method for testing the tensile strength of carbon fiber multifilament according to claim 3, characterized in that: The step of clamping the unbonded carbon fiber multifilament in the upper fixture and the lower fixture in an S-shape comprises: Clamping one end of the unbonded carbon fiber multifilament into the upper clamp; Controlling the opening and closing of the clamp, applying tension at the other end, so that the unbonded carbon fiber multifilament is straightened axially and clamped into the lower clamp; Wherein, the distance between the end surface of the upper clamp and the end surface of the lower clamp is 100mm-300mm.

5. The method for testing the tensile strength of carbon fiber multifilament according to claim 4, characterized in that: The method of clamping the non-glue carbon fiber multifilament on a fixture for testing comprises: The tensile strength of the unbonded carbon fiber multifilament is tested using a tensile testing machine, wherein the load of the tensile testing machine is 1KN-5KN; The stretching speed is 1mm / min-100mm / min.

6. The method for testing the tensile strength of carbon fiber multifilament according to claim 3, characterized in that: The testing method further comprises: When the tensile strength of the non-glue yarn carbon fiber multifilament is tested, the failure form of the non-glue yarn carbon fiber multifilament is recorded; The damage forms include effective fracture and invalid fracture. The invalid fracture includes slipping of the unbonded carbon fiber multifilament, fracture of the unbonded carbon fiber multifilament in the fixture, and fracture of the unbonded carbon fiber multifilament within 5 mm from the end face of the fixture.

7. A testing device for tensile strength of carbon fiber multifilament, characterized in that: The tensile strength test of the same model but different axis carbon fiber multifilaments without glue yarn and dipped yarn carbon fiber multifilaments is carried out, including: A first tensile strength testing module is used to perform a tensile strength test on the unbonded carbon fiber multifilament to obtain a first tensile strength; A second tensile strength testing module is used to perform a tensile strength test on the dipped yarn carbon fiber multifilament to obtain a second tensile strength; A linear relationship acquisition module, configured to acquire a linear relationship between the first tensile strength and the second tensile strength according to the first tensile strength and the second tensile strength; A process parameter adjustment module is used to adjust the process parameters of the carbon fiber multifilament, and use the carbon fiber multifilament obtained after the process parameter adjustment as the carbon fiber multifilament to be tested; A third tensile strength testing module is used to perform a tensile strength test on the carbon fiber multifilament to be tested to obtain a third tensile strength; A fourth tensile strength acquisition module is used to obtain a fourth tensile strength of the carbon fiber multifilament to be tested based on the third tensile strength and the linear relationship, wherein the fourth tensile strength is used to characterize the predicted tensile strength of the carbon fiber multifilament to be tested after being dipped in resin.

8. A computer device, characterized in that: include: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to execute the method for testing the tensile strength of carbon fiber multifilament according to any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by a processor, the method for testing the tensile strength of carbon fiber multifilament according to any one of claims 1 to 6 is performed.

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