Resin-based composite material fiber ejection test device and test method

Abstract

The invention discloses a resin-based composite material fiber ejection test device and a test method. The test device comprises a fixed platform, a position fine adjustment mechanism, a fixed part, an ejection mechanism and observation equipment. And the ejection mechanism can be close to the fixed platform under the driving of the power equipment. The position fine adjustment mechanism is installed on the fixed platform and used for adjusting the position of the movable platform so as to adjust the force application point of the ejection mechanism on the fiber test piece. The fixing piece is detachably mounted on the movable platform so as to fix the fiber test piece on the movable platform; the observation device is used for magnifying and observing the position of the pressing needle in the ejection mechanism. The fiber test piece is fixed on the movable platform through the detachable fixing piece, so that the fiber test piece is convenient to replace, and the ejection test can be carried out on fibers with larger diameters; the relative position of the pressing needle and the fiber test piece is observed by utilizing the micro-distance camera, and then the movable platform is driven to move through the first driving device and the second driving device, so that the pressing position of the pressing needle on the fiber test piece can be finely adjusted.

Description

Technical Field

[0001] The invention relates to the field of composite material mechanics, and in particular to a fiber ejection test device and a test method for a resin-based composite material. Background Art

[0002] Fiber-reinforced resin-based composite materials have the characteristics of high specific strength, high specific modulus, low density, corrosion resistance, high temperature resistance, etc. Compared with traditional metals, they have obvious advantages and are widely used in machinery manufacturing, transportation, aerospace and other fields. At present, the main methods for testing the interfacial shear strength of composite materials are: fiber pulling method, micro-droplet debonding method, single fiber breaking method, fiber ejection method, etc. Among them, the fiber ejection method is a more widely used test method because the test process is relatively simple and the cost is low.

[0003] The fiber ejection test requires that the fiber-reinforced composite material be cut into thin slices in a direction perpendicular to the fiber axis, and then an axial load is applied to the fiber with a pressure pin until the fiber is completely debonded from the matrix and pressed out of the matrix, and the maximum load in this process is recorded. The specimens for the fiber ejection test do not require special preparation and can be cut from actual composite materials. In-situ tests can be performed on real resin-based composite materials, thus reflecting the effects of the actual preparation and processing technology of composite materials on the interfacial properties of the material. It can also be used to determine the interfacial shear strength under fatigue or environmental factors (such as temperature, humidity and chemicals) during the use of the material, and monitor changes in interfacial properties.

[0004] At present, nanoindenters are generally used to perform ejection tests on metal-based composite materials. However, nanoindenters are complex to operate and costly, and the clamping and fixing of fiber specimens is troublesome, so ejection tests cannot be performed on fibers (optical fibers) with larger diameters. Moreover, the ejection position of the indenter has a great influence on the test results. How to fine-tune the ejection position of the indenter to ensure the accuracy of the test results is a problem that needs to be solved in the current fiber ejection test method. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a resin-based composite fiber ejection test device, which is convenient for replacing fiber test pieces and can fine-tune the ejection position of the pressure needle.

[0006] The present invention also provides a testing method based on the resin-based composite material fiber ejection testing device.

[0007] A resin-based composite fiber ejection test device according to a first aspect of the present invention comprises:

[0008] Fixed platform;

[0009] The position fine-tuning mechanism comprises a movable platform, a first driving device and a second driving device, wherein the movable platform is slidably connected to the fixed platform, the first driving device drives the movable platform to move along the x direction, and the second driving device drives the movable platform to move along the y direction; the movable platform is provided with an ejection hole;

[0010] A fixing member, which is detachably connected to the movable platform, and the fixing member fixes the fiber specimen to be tested on the movable platform and covers the ejection hole;

[0011] An ejection mechanism, which can approach the fixed platform along the z direction, and a pressure needle is provided at the end of the ejection mechanism to apply pressure to the fiber specimen;

[0012] The observation device comprises a macro camera facing the fiber specimen and is used for observing the relative position of the pressing needle and the fiber specimen.

[0013] The resin-based composite fiber ejection test device according to the embodiment of the present invention has at least the following beneficial effects: the fiber specimen is fixed to the movable platform by a detachable fixing part, and the fiber specimen can be replaced only by removing the fixing part, which is convenient for replacement, and the ejection test can be performed on fibers with larger diameters; the relative position of the pressure needle and the fiber specimen is observed by a macro camera, and then the movable platform is driven to move by the first driving device and the second driving device, so that the pressure position of the pressure needle on the fiber specimen can be finely adjusted.

[0014] According to some embodiments of the present invention, the first driving device includes a first slide rail, a first slider and a first manual adjustment screw, the first slide rail extends along the x direction and the first slider is slidingly connected to the first slide rail, the first manual adjustment screw is threadedly connected to the first slide rail, the end of the first manual adjustment screw is abutted or rotationally connected to the first slider, and screwing the first manual adjustment screw can drive the first slider to move.

[0015] According to some embodiments of the present invention, a first limiting member is installed on the first slide rail, the first limiting member is provided with a first limiting groove opened along the x direction, and a first limiting column capable of sliding in the first limiting groove is installed on the first slide block.

[0016] According to some embodiments of the present invention, the second driving device includes a second slide rail, a second slider, and a second manual adjustment screw, the second slide rail extends along the y direction and the second slider is slidably connected to the second slide rail, the second manual adjustment screw is threadedly connected to the second slide rail, the end of the second manual adjustment screw is abutted against or rotationally connected to the second slider, and screwing the second manual adjustment screw can drive the second slider to move.

[0017] According to some embodiments of the present invention, a second limiting member is installed on the second slide rail, the second limiting member is provided with a second limiting groove opened along the y direction, and a second limiting column capable of sliding in the second limiting groove is installed on the second slide block.

[0018] According to some embodiments of the present invention, the first slide rail is fixedly connected to the fixed platform, the second slide rail is connected to the first slider, and the movable platform is connected to the second slider.

[0019] According to some embodiments of the present invention, the movable platform is provided with a mounting hole, and the fixing member is inserted into the mounting hole to complete the fixing.

[0020] According to some embodiments of the present invention, a thread is provided in the mounting hole, and the fixing member is threadedly connected to the mounting hole.

[0021] According to some embodiments of the present invention, there are two macro cameras, and the distance between the pressure needle and the fiber specimen is calculated by binocular recognition.

[0022] The testing method according to the second aspect of the present invention is based on the above-mentioned resin-based composite fiber ejection test device and includes the following steps:

[0023] The fiber-reinforced composite material is sliced ​​into thin slices along a direction perpendicular to the fiber axis to obtain a fiber specimen, and the surface of the fiber specimen is polished;

[0024] Install the fiber specimen on the movable platform and fix the fiber specimen with a fixing device;

[0025] Observe the relative position of the pressure needle and the fiber specimen through the macro camera to determine the force point on the fiber specimen where pressure needs to be applied;

[0026] Adjusting the first driving device and the second driving device to drive the movable platform to move so that the pressure pin is aligned with the force point on the fiber specimen;

[0027] Starting an external power device to drive the ejection mechanism to approach the fixed platform until the pressing needle breaks through the fiber specimen and enters the ejection hole;

[0028] The change in the force of the indenter is recorded to calculate the interfacial shear strength of the fiber specimen.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0031] Figure 1 A three-dimensional diagram of a fiber ejection test device for a resin-based composite material according to an embodiment of the first aspect of the present invention;

[0032] Figure 2 It is a first three-dimensional diagram of the position fine-tuning mechanism 200 in the resin-based composite material fiber ejection test device according to the first aspect of the embodiment of the present invention;

[0033] Figure 3 This is a second three-dimensional diagram of the position fine-tuning mechanism 200 in the resin-based composite material fiber ejection test device according to the first aspect of the embodiment of the present invention.

[0034] Figure markings: 100-fixed platform, 200-position fine-adjustment mechanism, 210-movable platform, 220-first driving device, 221-first slide rail, 222-first slider, 223-first hand-adjustable screw, 224-first limiting member, 225-first limiting column, 230-second driving device, 231-second slide rail, 232-second slider, 233-second hand-adjustable screw, 234-second limiting member, 235-second limiting column, 300-fixed member, 400-ejection mechanism, 410-pressing needle. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] The fiber ejection test requires that the fiber-reinforced composite material be cut into thin slices in a direction perpendicular to the fiber axis, and then an axial load is applied to the fiber with a pressure pin until the fiber is completely debonded from the matrix and pressed out of the matrix, and the maximum load in this process is recorded. The specimens for the fiber ejection test do not require special preparation and can be cut from actual composite materials. In-situ tests can be performed on real resin-based composite materials, thus reflecting the effects of the actual preparation and processing technology of composite materials on the interfacial properties of the material. It can also be used to determine the interfacial shear strength under fatigue or environmental factors (such as temperature, humidity and chemicals) during the use of the material, and monitor changes in interfacial properties.

[0041] At present, nanoindenters are generally used to perform ejection tests on metal-based composite materials. However, nanoindenters are complex to operate and costly, and the clamping and fixing of fiber specimens is troublesome, so ejection tests cannot be performed on fibers (optical fibers) with larger diameters. Moreover, the ejection position of the indenter has a great influence on the test results. How to fine-tune the ejection position of the indenter to ensure the accuracy of the test results is a problem that needs to be solved in the current fiber ejection test method.

[0042] In this regard, the present application proposes a resin-based composite fiber ejection test device, in which the fiber specimen is fixed to a movable platform by a detachable fixing part. To replace the fiber specimen, it is only necessary to remove the fixing part, which is convenient to replace and can perform ejection tests on fibers with larger diameters. A macro camera is used to observe the relative position of the pressure needle and the fiber specimen, and then the movable platform is driven to move by the first drive device and the second drive device, so that the pressure position of the pressure needle on the fiber specimen can be finely adjusted.

[0043] In addition, the present application also proposes a testing method based on the above-mentioned resin-based composite material fiber ejection test device.

[0044] Reference Figure 1, the resin-based composite fiber ejection test device in the embodiment of the first aspect of the present application includes a fixed platform 100, a position fine-tuning mechanism 200, a fixing member 300, an ejection mechanism 400 and an observation device. Among them, the fixed platform 100 and the ejection mechanism 400 are both fixedly installed to an external power device, and the ejection mechanism 400 can be driven by the power device to approach the fixed platform 100, thereby completing the ejection test of the fiber specimen. The position fine-tuning mechanism 200 is installed on the fixed platform 100, and is used to adjust the position of the movable platform 210 to adjust the force application point of the ejection mechanism 400 on the fiber specimen. The fixing member 300 is detachably installed on the movable platform 210, and can fix the fiber specimen to the movable platform 210. The observation device is used to magnify and observe the position of the pressure pin 410 in the ejection mechanism 400, so as to facilitate the subsequent adjustment of the position fine-tuning mechanism 200.

[0045] Specifically, the position fine-tuning mechanism 200 includes a movable platform 210, a first driving device 220 and a second driving device 230. The movable platform 210 is slidably connected to the fixed platform 100. The first driving device 220 drives the movable platform 210 to move in the x direction, and the second driving device 230 drives the movable platform 210 to move in the y direction, so that the movable platform 210 can move in two dimensions. The movable platform 210 is provided with an ejection hole for avoiding the ejection action of the subsequent ejection mechanism 400.

[0046] The fixing part 300 is detachably connected to the movable platform 210, and the fixing part 300 fixes the fiber specimen to be tested on the movable platform 210 and covers the ejection hole. The fixing part 300 has no requirements on the size of the fiber specimen that can be fixed, so that the ejection test can be performed on fibers or optical fibers with larger diameters. The ejection mechanism 400 can approach the fixed platform 100 along the z direction, and a pressure pin 410 is provided at the end of the ejection mechanism 400 to apply pressure to the fiber specimen. Thus, when the external power device is started, the ejection mechanism 400 approaches the fixed platform 100, the pressure pin 410 applies pressure to the fiber specimen and finally breaks it, and the pressure pin 410 extends into the ejection hole to prevent the pressure pin 410 from directly contacting the movable platform 210 and causing damage to the pressure pin 410.

[0047] The observation device includes a macro camera facing the fiber specimen, which is used to observe the relative position of the pressing needle 410 and the fiber specimen, so as to guide the experimenter to adjust the position fine-tuning mechanism 200.

[0048] Optionally, refer to Figure 2 and Figure 3The first driving device 220 includes a first slide rail 221, a first slider 222, and a first manual screw 223. The first slide rail 221 extends along the x direction and the first slider 222 is slidably connected to the first slide rail 221, the first manual screw 223 is threadedly connected to the first slide rail 221, and the end of the first manual screw 223 is abutted against or rotationally connected to the first slider 222, so that when the first manual screw 223 is screwed, the first slider 222 can be driven to move along the first slide rail 221.

[0049] Furthermore, a first limit member 224 is installed on the first slide rail 221, and the first limit member 224 is provided with a first limit groove opened along the x direction. A first limit column 225 capable of sliding in the first limit groove is installed on the first slider 222, so that the moving distance of the first limit column 225 is limited by the first limit groove, thereby limiting the maximum moving stroke of the first slider 222.

[0050] Optionally, the second driving device 230 includes a second slide rail 231, a second slider 232, and a second manual screw 233. The second slide rail 231 extends along the y direction and the second slider 232 is slidably connected to the second slide rail 231, the second manual screw 233 is threadedly connected to the second slide rail 231, and the end of the second manual screw 233 is abutted against or rotationally connected to the second slider 232, so that when the second manual screw 233 is screwed, the second slider 232 can be driven to move along the second slide rail 231.

[0051] Furthermore, a second limit member 234 is installed on the second slide rail 231, and the second limit member 234 is provided with a second limit groove opened along the y direction. A second limit column 235 capable of sliding in the second limit groove is installed on the second slider 232, so that the moving distance of the second limit column 235 is limited by the second limit groove, thereby limiting the maximum moving stroke of the second slider 232.

[0052] Specifically, in the position fine-tuning mechanism 200, the first slide rail 221 is fixedly connected to the fixed platform 100, the second slide rail 231 is connected to the first slider 222, and the movable platform 210 is connected to the second slider 232. Thus, the two-dimensional movement of the movable platform 210 is achieved through the joint driving of the first driving device 220 and the second driving device 230.

[0053] It is easy to understand that the first driving device 220 and the second driving device 230 can also use electric push rods, pneumatic push rods, hydraulic push rods or screw mechanisms to drive the movable platform 210, which will not be repeated here.

[0054] Furthermore, the movable platform 210 is provided with a mounting hole, and the fixing member 300 is inserted into the mounting hole to complete the fixing, so as to facilitate the plugging and unplugging of the fixing member 300 to complete the assembly and disassembly. Specifically, a thread is provided in the mounting hole, and the fixing member 300 is threadedly connected with the mounting hole, and the fixing member 300 is fixed by screwing the fixing member 300.

[0055] Furthermore, the pressing pin 410 on the ejection mechanism 400 is connected to the ejection mechanism 400 in a detachable connection manner, and the pressing pin 410 of different sizes can be replaced according to different experimental requirements.

[0056] Furthermore, there are two macro cameras, which calculate the distance between the pressure needle 410 and the fiber specimen by binocular recognition, thereby achieving higher detection accuracy.

[0057] A testing method in an embodiment of the second aspect of the present application is performed based on the above-mentioned resin-based composite material fiber ejection test device, comprising the following steps:

[0058] S100. Cutting the fiber-reinforced composite material into thin slices along a direction perpendicular to the fiber axis to obtain a fiber specimen, and grinding and polishing the surface of the fiber specimen;

[0059] S200. The fiber specimen is mounted on the movable platform 210, and the fiber specimen is fixed using the fixing member 300;

[0060] S300. Observe the relative position of the pressure needle 410 and the fiber specimen through a macro camera to determine the force point on the fiber specimen where pressure needs to be applied;

[0061] S400. Adjust the first drive device 220 and the second drive device 230 to drive the movable platform 210 to move so that the pressure needle 410 is aligned with the force point on the fiber specimen;

[0062] S500. Start the external power device to drive the ejection mechanism 400 to approach the fixed platform 100 until the pressure needle 410 breaks through the fiber specimen and enters the ejection hole;

[0063] S600. Record the change of the force applied by the pressure needle 410, thereby calculating the interface shear strength of the fiber specimen.

[0064] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A resin-based composite fiber ejection test device, characterized in that: include: Fixed platform; The position fine-tuning mechanism comprises a movable platform, a first driving device and a second driving device, wherein the movable platform is slidably connected to the fixed platform, the first driving device drives the movable platform to move along the x direction, and the second driving device drives the movable platform to move along the y direction; the movable platform is provided with an ejection hole; A fixing member, which is detachably connected to the movable platform, and the fixing member fixes the fiber specimen to be tested on the movable platform and covers the ejection hole; An ejection mechanism, which can approach the fixed platform along the z direction, and a pressure needle is provided at the end of the ejection mechanism to apply pressure to the fiber specimen; The observation device comprises a macro camera facing the fiber specimen and is used for observing the relative position of the pressing needle and the fiber specimen.

2. The resin-based composite fiber ejection test device according to claim 1, characterized in that: The first driving device includes a first slide rail, a first slider and a first manual adjustment screw. The first slide rail extends along the x direction and the first slider is slidably connected to the first slide rail. The first manual adjustment screw is threadedly connected to the first slide rail. The end of the first manual adjustment screw is abutted against or rotationally connected to the first slider. Screwing the first manual adjustment screw can drive the first slider to move.

3. The resin-based composite fiber ejection test device according to claim 2, characterized in that: A first limiting member is installed on the first slide rail. The first limiting member is provided with a first limiting groove opened along the x direction. A first limiting column capable of sliding in the first limiting groove is installed on the first sliding block.

4. The resin-based composite fiber ejection test device according to claim 2, characterized in that: The second driving device includes a second slide rail, a second slider and a second manual adjustment screw. The second slide rail extends along the y direction and the second slider is slidably connected to the second slide rail. The second manual adjustment screw is threadedly connected to the second slide rail. The end of the second manual adjustment screw is abutted against or rotationally connected to the second slider. Screwing the second manual adjustment screw can drive the second slider to move.

5. The resin-based composite fiber ejection test device according to claim 4, characterized in that: A second limiting member is installed on the second slide rail, the second limiting member is provided with a second limiting groove opened along the y direction, and a second limiting column capable of sliding in the second limiting groove is installed on the second sliding block.

6. The resin-based composite fiber ejection test device according to claim 4, characterized in that: The first slide rail is fixedly connected to the fixed platform, the second slide rail is connected to the first slider, and the movable platform is connected to the second slider.

7. The resin-based composite fiber ejection test device according to claim 1, characterized in that: The movable platform is provided with a mounting hole, and the fixing piece is inserted into the mounting hole to complete the fixing.

8. The resin-based composite fiber ejection test device according to claim 7, characterized in that: The mounting hole is provided with a thread, and the fixing piece is threadedly connected to the mounting hole.

9. The resin-based composite fiber ejection test device according to claim 1, characterized in that: There are two macro cameras, and the distance between the pressure needle and the fiber specimen is calculated by binocular recognition.

10. A test method, based on the resin-based composite fiber ejection test device according to any one of claims 1 to 9, characterized in that: include: The fiber-reinforced composite material is sliced ​​into thin slices along a direction perpendicular to the fiber axis to obtain a fiber specimen, and the surface of the fiber specimen is polished; Install the fiber specimen on the movable platform and fix the fiber specimen with a fixing device; Observe the relative position of the pressure needle and the fiber specimen through the macro camera to determine the force point on the fiber specimen where pressure needs to be applied; Adjusting the first driving device and the second driving device to drive the movable platform to move so that the pressure pin is aligned with the force point on the fiber specimen; Starting an external power device to drive the ejection mechanism to approach the fixed platform until the pressing needle breaks through the fiber specimen and enters the ejection hole; The change in the force of the indenter is recorded to calculate the interfacial shear strength of the fiber specimen.

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