A device and method for simulating lateral deformation during ceramic fiber weaving

Abstract

The present invention provides a device and method for simulating lateral deformation during the weaving process of ceramic fibers, belonging to the technical field of high-performance material performance testing. The device comprises a humidity control system, a tension control mechanism, and a lifting mechanism. The lifting mechanism includes a lifting platform, on which is mounted a sensing assembly comprising a sensor and a mandrel, the mandrel being mounted on the upper surface of the sensor; a glass plate is positioned above the mandrel; the tension control mechanism includes a clamping module and a suspension module; and a microscope is positioned above the glass plate. The present invention is simple to operate and offers high measurement accuracy. Using the present invention to perform lateral compression testing on ceramic fibers not only simulates the deformation capacity of ceramic fibers during the weaving process but also provides accurate data support for optimizing ceramic fiber weaving process parameters, thereby improving the weaving efficiency and mechanical properties of ceramic fiber preforms.

Description

Technical Field

[0001] The invention belongs to the technical field of high-performance material performance testing, and in particular relates to a lateral deformation simulation device and a testing method during a ceramic fiber weaving process. Background Art

[0002] Ceramic fiber is a fibrous, lightweight refractory material with advantages such as light weight, high-temperature resistance, excellent thermal stability, low thermal conductivity, low specific heat, and resistance to mechanical vibration. Ceramic-based composites reinforced with ceramic fiber offer high mechanical properties, strong wave transmission, and excellent high-temperature and corrosion resistance. They are internationally recognized as a new generation of leading materials for high-temperature hot-end components.

[0003] As a reinforcement for composite materials, the structural integrity of ceramic fiber preforms directly determines the mechanical properties and service life of the composite material. During the preform preparation process, multiple layers of fibers are cross-woven and squeezed against each other, and are subjected to compression and shear stresses at the interweaving points. The tightness of the fiber interweaving affects the fiber volume fraction of the preform. Better lateral deformation capability can allow more fibers to be packed into a preform of a certain size, thereby improving the mechanical properties of the preform. However, this places stringent requirements on the lateral deformation capability of the fibers. However, the inherent brittleness and stiffness of ceramic fibers limit their deformation ability during the weaving process.

[0004] During the ceramic fiber weaving process, due to significant differences in climatic conditions between northern and southern China, the fibers exhibit significant variations in their ability to deform transversely under varying humidity conditions, significantly impacting the preform's molding efficiency and final performance. In high humidity environments, a continuous water film forms on the fiber surface. Hydrogen bonding strengthens the adhesion between the individual filaments within the fiber, significantly increasing the interfilament adhesion effect. This adhesion effect inhibits the fiber's ability to deform transversely during the weaving process, thereby affecting the preform's molding efficiency and adversely affecting the mechanical properties and structural uniformity of the final product.

[0005] At present, there is still a gap in the domestic systematic research on the lateral deformation ability of ceramic fibers, and the market price of ceramic fibers is much higher than that of carbon fibers. It is costly and inefficient to study the influence of the lateral deformation ability of ceramic fibers on the fiber volume fraction through actual weaving behavior. Therefore, it is very necessary to simulate the lateral deformation ability of ceramic fibers during the weaving process through experiments.

[0006] To simulate and study the lateral deformation capacity of ceramic fibers during the weaving process and address the gap in testing technology for this capacity, a device has been developed that can accurately simulate and measure the lateral deformation capacity of ceramic fibers under varying humidity conditions. This allows for understanding the lateral deformation performance of ceramic fibers in actual weaving environments. This technological breakthrough not only helps accurately evaluate the weavability of ceramic fibers but also provides a scientific basis for optimizing weaving process parameters. This has important application value and theoretical significance for improving the final performance and structural uniformity of ceramic fiber preforms. Summary of the Invention

[0007] The problem to be solved by the present invention is to provide a device and a test method for simulating transverse deformation in a ceramic fiber weaving process.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a lateral deformation simulation device in the ceramic fiber weaving process, including a tension control mechanism and a lifting mechanism; the lifting mechanism includes a lifting platform, and a sensor component is installed on the lifting platform, and the sensor component includes a sensor and a head, which is used to record real-time compression stress while compressing the ceramic fiber, and the head is installed on the upper surface of the sensor, and the contact surface between the head and the ceramic fiber is an upwardly convex arc; a glass plate is arranged above the head; the tension control mechanism includes a clamping module and a suspension module, and the clamping module includes a chuck, and the chuck is installed on the chuck bracket, and the suspension module is plate-shaped, and a semicircular groove is provided on the upper edge of the suspension module; a microscope is arranged above the glass plate.

[0009] Furthermore, the present invention is also provided with a humidity control system, which includes a humidity controller, a humidification chamber and a humidity sensor. The humidification chamber cover is arranged on the outside of the lifting mechanism, the sensor component and the glass plate. The humidity sensor is installed on the lifting platform. The humidity controller includes a control screen and a humidification box for regulating the humidity environment of the ceramic fiber.

[0010] Furthermore, the top of the humidifying chamber is of open design; the humidifying chamber is made of transparent material.

[0011] Furthermore, the humidity in the humidification chamber is controlled in a range of 15% to 80%.

[0012] Furthermore, the lifting platform is driven to move up and down by a screw rod mechanism to control the lifting stroke.

[0013] Furthermore, the glass support plates are symmetrically installed on the left and right sides of the lifting mechanism. A transverse groove is provided on each glass support plate. Both ends of the glass plate are inserted into the groove and fixed to the glass support plate by fixing members.

[0014] Furthermore, the clamping module and the suspension module are installed on the front and rear sides of the lifting mechanism, and the clamping head, the top head and the groove are located in a straight line.

[0015] Furthermore, the microscope is located directly above the top head, and the microscope is installed on a microscope fixing frame.

[0016] The present invention also provides a method for testing lateral deformation during ceramic fiber weaving, comprising the following steps:

[0017] S1. Open the humidification chamber, take the ceramic fiber sample, place one end of the sample in the clamping module of the tension control mechanism, and fix it with a chuck;

[0018] S2. Pass the sample between the glass plate and the mandrel, place the other end of the sample on the suspension module, and use weights to hang on the sample to control the pre-tension;

[0019] S3, closing the humidification chamber, adjusting and maintaining the humidity in the humidification chamber to the target humidity;

[0020] S4. Control the lifting platform to rise until the stress reaches 0.01N, which is the start of the test. Continue to squeeze the fibers of the sample, and record the compressive stress of each node and the fiber expansion width of the sample through sensors and microscopes until the lifting mechanism reaches its maximum range.

[0021] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0022] (1) The present invention uses a lifting mechanism to perform extrusion between the head and the glass plate, with a range of motion accurate to 0.01 mm, which can achieve micro-extrusion of ceramic fibers, consistent with the state of fibers subjected to lateral stress during the weaving process.

[0023] (2) The present invention uses a humidity control system to simulate the lateral deformation behavior of ceramic fibers during the weaving process under different humidity environments, and then systematically study the mechanism by which humidity affects the lateral deformation ability of ceramic fibers.

[0024] (3) The present invention realizes the application of tension to the ceramic fiber and the fixation of the axial direction through the tension control mechanism, which can better simulate the deformation state of the ceramic fiber during the weaving process.

[0025] (4) The present invention uses sensors and microscopes to observe the lateral stress and fiber expansion state of ceramic fibers in real time during the extrusion process, and then evaluates the lateral deformation state of ceramic fibers under different extrusion degrees during the weaving process.

[0026] (5) The present invention can simulate the different bending curvatures of ceramic fibers during the weaving process by changing the curvature radius of the plug, thereby testing the lateral deformation behavior of the ceramic fibers under different bending states.

[0027] (6) The present invention can simulate and test the weaving behavior of ceramic fibers in different forms (such as plying, twisting, etc.), thereby achieving an accurate evaluation of the lateral deformation capacity of ceramic fibers in various forms.

[0028] The present invention uses a tension control mechanism to place a ceramic fiber sample and control pre-tension. Stress is applied to the sample by lifting and lowering a mandrel and a glass plate to compress the sample. Sensors and a microscope record the stress and fiber expansion state. This allows the present invention to achieve micro-deformation behavior of ceramic fibers by controlling compressive stress, stroke, fiber tension, and fiber curvature, simulating the lateral deformation of ceramic fibers under different bending conditions during the weaving process.

[0029] Furthermore, the present invention utilizes a humidity control system to precisely regulate ambient humidity, simulating the lateral deformation behavior of ceramic fibers during weaving under varying humidity conditions. By applying a specific humidity environment through a humidity control device and combining sensors and a microscope to record the fiber's stress changes and expansion state in real time, the invention enables a systematic assessment of the impact of humidity on the ceramic fiber's lateral deformation capacity.

[0030] The present invention is simple to operate and offers high measurement accuracy, overcoming subjective testing methods such as manual measurement and ensuring reliable and accurate test results. Using the present invention to perform transverse compression testing on ceramic fibers not only simulates the deformation behavior of ceramic fibers during the weaving process but also provides accurate data support for optimizing ceramic fiber weaving process parameters, thereby improving the weaving efficiency and mechanical properties of ceramic fiber preforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with examples, and the advantages and implementation modes of the present invention will become more apparent. The contents shown in the accompanying drawings are only used to illustrate the present invention and do not constitute any limitation to the present invention. In the accompanying drawings:

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Figure 2 It is the front view of the present invention.

[0034] Figure 3 It is a top view of the present invention.

[0035] Figure 4 It is a schematic diagram of the internal structure of the present invention.

[0036] Figure 5 This is an expanded view of the silicon carbide fiber of the present invention before transverse deformation.

[0037] Figure 6This is an expanded view of the silicon carbide fiber of the present invention after transverse deformation.

[0038] In the picture:

[0039] 1. Humidity control system; 2. Base plate; 3. Lifting mechanism; 4. Sensing component; 5. Glass plate; 6. Glass support plate; 7. Tension control mechanism; 8. Observation component; 11. Humidity controller; 12. Humidification chamber; 13. Humidity sensor; 31. Screw mechanism; 32. Lifting platform; 33. Connecting plate; 41. Force sensor; 42. Head; 61. Fixing part; 71. Clamping module; 72. Suspension module; 81. Microscope fixing frame; 82. Microscope; 111. Control panel; 112. Humidification box; 711. Chuck; 712. Nut; 721. Groove. DETAILED DESCRIPTION

[0040] like Figures 1 to 6 As shown, the present invention is a device for simulating lateral deformation in a ceramic fiber weaving process, comprising a base plate 2 for carrying a glass support plate 6, a tension control mechanism 7 and a lifting mechanism 3; the lifting mechanism 3 comprises a lifting platform 32, on which a connecting plate 33 is mounted, and the connecting plate 33 is used to fix a sensor assembly 4, and the lifting platform 32 is driven up and down by a screw rod mechanism 31 to control the lifting stroke; the sensor assembly 4 comprises a force sensor 41 and a mandrel 42 for recording real-time compressive stress while compressing the ceramic fiber, the mandrel 42 being mounted on the upper surface of the force sensor 41, and the contact surface of the mandrel 42 with the ceramic fiber is in an upwardly convex arc; a glass plate 5 is arranged above the mandrel 42, and the glass support plates 6 are symmetrically mounted on the left and right sides of the lifting mechanism 3, with each side having a A transverse groove is provided, into which both ends of the glass plate 5 are inserted and secured to the glass support plate 6 via fixings 61. The tension control mechanism 7 comprises a clamping module 71 and a suspension module 72, mounted on the front and rear sides of the lifting mechanism 3. The clamping module 71 comprises a chuck 711, which is mounted on a chuck bracket via two nuts 712. The suspension module 72 is plate-shaped, with a semicircular groove 721 defined on its upper edge. The chuck 711, the mandrel 42, and the groove 721 are aligned. One end of the fiber sample is clamped by the clamping module 71 of the tension control mechanism 7 and passed between the glass plate 5 and the mandrel 42. The other end, with a weight attached, passes through the groove 721 of the suspension module 72 to control the tension. A microscope 82 is positioned above the glass plate 5, directly above the mandrel 42 and mounted on a microscope mounting bracket 81.

[0041] Among them, the present invention is also provided with a humidity control system 1, which includes a humidity controller 11, a humidification chamber 12 and a humidity sensor 13. The humidification chamber 12 is covered on the outside of the lifting mechanism 3, the sensor component 4 and the glass plate 5. The humidity sensor 13 is installed on the lifting platform 32. The humidity controller 11 includes a control screen 111 and a humidification box 112, which are used to regulate the humidity environment of the ceramic fiber.

[0042] The top of the humidifying chamber 12 is designed to be open.

[0043] The humidifying chamber 12 is made of transparent material.

[0044] The humidity in the humidifying chamber 12 is controlled within a range of 15% to 80%.

[0045] The glass plate 5 is made of quartz glass; the ceramic fiber is quartz fiber, alumina fiber, silicon nitride fiber, silicon carbide fiber or boron nitride fiber.

[0046] The force sensor 41 has a measuring range of 0-10N, accurate to 0.01N; the lifting mechanism 3 has a range of 0-10mm, with a minimum range of 0.01mm; and the curvature radius of the plunger 42 is 5mm, 5.5mm, 6mm, 6.5mm or 7mm.

[0047] The ceramic fibers used in the present invention are all single-strand fibers.

[0048] The present invention also provides a method for testing lateral deformation during ceramic fiber weaving, comprising the following steps:

[0049] S1. Open the humidification chamber 12, take a 30 mm long ceramic fiber sample, place one end of the sample in the clamping module 71 of the tension control mechanism 7, and secure it with the chuck 711;

[0050] S2. Pass the sample between the glass plate 5 and the mandrel 42, place the other end of the sample on the suspension module 72, and use a 100g weight to suspend the sample to control the pre-tension;

[0051] S3, closing the humidification chamber 12, adjusting and maintaining the humidity in the humidification chamber 12 to the target humidity;

[0052] S4. Rotate the screw rod mechanism 31 to control the lifting platform 32 to rise until the stress reaches 0.01N, which is the start of the test. Continue to squeeze the fiber of the sample. The lifting mechanism 3 uses 1mm of movement as a node. The sensor and microscope record the compressive stress of each node and the fiber expansion width of the sample until the movement reaches the maximum.

[0053] The ceramic fiber sample does not contact the humidification chamber 12 and can pass through the humidification chamber 12 .

[0054] Example: The transverse deformation testing method of the ceramic fiber weaving process of the present invention is adopted, and the parameters of the ceramic fiber sample are shown in Table 1.

[0055] Table 1 Parameters of ceramic fiber samples in various examples

[0056]

[0057] As shown in Table 2, through Examples 1 to 3, the lateral deformation capabilities of the ceramic fiber under different bending degrees can be obtained.

[0058] Table 2 Transverse deformation capacity of ceramic fibers at different bending degrees

[0059]

[0060] As shown in Table 3, through Examples 4 to 6, the lateral deformation capacity of the ceramic fiber under different humidity environments can be obtained.

[0061] Table 3 Transverse deformation capacity of ceramic fibers under different humidity environments

[0062]

[0063] As shown in Table 4, through Examples 7 to 9, the lateral deformation capabilities of the ceramic fibers in different forms can be obtained.

[0064] Table 4 Transverse deformation capacity of ceramic fibers in different forms

[0065]

[0066] As can be seen, the present invention utilizes a synchronized measurement method using a high-precision sensor and a lifting mechanism. This method can also be combined with a camera to simulate different conditions encountered during the weaving process, observing the deformation capacity of the ceramic fiber and analyzing the varying degrees of expansion caused by the fiber's inherent characteristics during the weaving process. Furthermore, the present invention can accurately simulate and measure the lateral deformation capacity of the ceramic fiber under varying curvature conditions by replacing the mandrels with different curvatures, depending on the different states of the ceramic fiber during the weaving process (e.g., beating-up, harness raising, etc.).

[0067] The embodiments of the present invention are described in detail above, but the contents are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A device for simulating lateral deformation during ceramic fiber weaving, characterized in that: It includes a tension control mechanism and a lifting mechanism; the lifting mechanism includes a lifting platform, on which a sensor component is installed, the sensor component includes a sensor and a plug, the plug is installed on the upper surface of the sensor, and the contact surface between the plug and the ceramic fiber is an upwardly convex arc; a glass plate is arranged above the plug; the tension control mechanism includes a clamping module and a suspension module, the clamping module includes a chuck, the chuck is installed on the chuck bracket, and a semicircular groove is provided on the upper edge of the suspension module; a microscope is arranged above the glass plate.

2. The device for simulating lateral deformation during ceramic fiber weaving according to claim 1, characterized in that: It also includes a humidity control system, which includes a humidity controller, a humidification chamber and a humidity sensor. The humidification chamber cover is arranged on the outside of the lifting mechanism, the sensor component and the glass plate. The humidity sensor is installed on the lifting platform. The humidity controller includes a control screen and a humidification box for regulating the humidity environment of the ceramic fiber.

3. The device for simulating lateral deformation during ceramic fiber weaving according to claim 2, characterized in that: The top of the humidifying chamber is open; the humidifying chamber is made of transparent material.

4. The device for simulating lateral deformation during ceramic fiber weaving according to claim 2, wherein: The humidity in the humidification chamber is controlled in a range of 15% to 80%.

5. The device for simulating lateral deformation during ceramic fiber weaving according to claim 1, characterized in that: The lifting platform is driven to move up and down by a screw rod mechanism.

6. The device for simulating lateral deformation during ceramic fiber weaving according to claim 1, characterized in that: The glass support plates are symmetrically installed on the left and right sides of the lifting mechanism. A transverse groove is provided on each glass support plate. Both ends of the glass plate are inserted into the groove and fixed to the glass support plate by fixing parts.

7. The device for simulating lateral deformation during ceramic fiber weaving according to claim 1, characterized in that: The clamping module and the suspension module are installed on the front and rear sides of the lifting mechanism.

8. The device for simulating lateral deformation during ceramic fiber weaving according to claim 4, characterized in that: The clamping head, the plug and the groove are located in a straight line.

9. The device for simulating lateral deformation during ceramic fiber weaving according to claim 1, characterized in that: The microscope is located right above the top head and is installed on a microscope fixing frame.

10. A method for testing lateral deformation during a ceramic fiber weaving process, implemented by the lateral deformation simulation device during a ceramic fiber weaving process according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Open the humidification chamber, take the ceramic fiber sample, place one end of the sample in the clamping module of the tension control mechanism, and fix it with a chuck; S2. Pass the sample between the glass plate and the mandrel, place the other end of the sample on the suspension module, and use weights to hang on the sample to control the pre-tension; S3, closing the humidification chamber, adjusting and maintaining the humidity in the humidification chamber to the target humidity; S4. Control the lifting platform to rise until the stress reaches 0.01N, which is the start of the test. Continue to squeeze the fibers of the sample, and record the compressive stress of each node and the fiber expansion width of the sample through sensors and microscopes until the lifting mechanism reaches its maximum range.

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