High-temperature strain test equipment and test method

Abstract

The invention relates to the technical field of high-temperature strain testing, and provides high-temperature strain testing equipment and a high-temperature strain testing method. A displacement control mechanism, a first stretching mechanism and a second stretching mechanism, the displacement control mechanism is connected to the equipment base body, the first stretching mechanism is connected to the equipment base body, and the second stretching mechanism is connected to the displacement control mechanism; the high-temperature environment providing device is provided with a testing cavity which is bidirectionally through in the second linear direction, when the high-temperature environment providing device is located at the working position, the first linear direction is aligned with the second linear direction, and the to-be-tested object fixed by the first stretching mechanism and the second stretching mechanism can be placed in the testing cavity; the measuring assembly comprises an optical fiber sensor and a demodulator, the optical fiber sensor can be connected to the to-be-tested object fixed by the first stretching mechanism and the second stretching mechanism, and the high-temperature strain testing equipment can improve the temperature and strain testing accuracy and reliability.

Description

Technical Field

[0001] The present application relates to the technical field of high-temperature strain testing, and more specifically, to a high-temperature strain testing device and a testing method. Background Art

[0002] Monitoring the performance of various structures and materials under varying conditions is crucial. With the continuous advancement of technology, the demand for strain measurement in high-temperature environments is increasing. In fields such as aerospace, energy, and metallurgy, many critical components operate under high-temperature conditions. Accurately measuring strain information is crucial for ensuring the safety and reliability of structures. The following describes the main shortcomings of existing high-temperature strain measurement methods.

[0003] High-temperature strain testing methods based on standard strain gauges: High-temperature strain gauges exhibit performance changes at elevated temperatures. Parameters such as sensitivity and heat output are affected by temperature, requiring complex temperature compensation and calibration. Furthermore, high-temperature strain gauges have a limited service life and may experience aging and failure in long-term high-temperature environments. Attaching strain gauges to specimens made of special materials or with complex structures can also be challenging, such as ceramics and composite materials, and ensuring a successful attachment is difficult.

[0004] High-temperature strain testing methods based on contacting extensometers: In high-temperature environments, direct contact between the contacting extensometer and the specimen can affect the specimen's temperature distribution due to heat conduction, leading to inaccurate measurement results. Furthermore, for materials susceptible to oxidation and corrosion at high temperatures, the contacting extensometer may chemically react with the material, damaging the extensometer or affecting its performance. For example, during high-temperature tensile testing of metal materials, the contact point of the contacting extensometer may adhere to the metal at high temperatures, affecting the measurement. Furthermore, the fixed gauge length of the contacting extensometer makes accurate installation and measurement difficult for irregularly shaped or small specimens.

[0005] High-temperature strain testing method based on a video extensometer: Video extensometers incorporate digital image correlation technology to obtain displacement and strain information by comparing images of the specimen before and after deformation. However, for specimens with complex shapes, complicated curves, or irregular structures, video extensometers struggle to find suitable marking points or characteristic areas on the surface for tracking, resulting in inaccurate or impossible measurements. High temperatures can interfere with thermal radiation and hot air currents, and contaminants inevitably adhere to the observation window during use. These factors can affect light propagation and imaging quality, impacting the accuracy of strain measurements. Furthermore, video extensometers can only capture partial images of the specimen surface, making it difficult to fully reflect the specimen's overall deformation, thus affecting the accuracy of strain measurements. Summary of the Invention

[0006] In view of this, the present application provides a high-temperature strain testing device to solve the technical problems of the high-temperature strain testing method in the prior art in terms of poor accuracy and reliability in strain measurement and difficulty in adapting to various shapes of pattern surfaces.

[0007] The present application provides a high-temperature strain testing device, wherein the high-temperature strain testing device comprises: Equipment base; a displacement control mechanism, a first stretching mechanism and a second stretching mechanism facing each other, the displacement control mechanism being connected to the device base, the first stretching mechanism being connected to the device base, the second stretching mechanism being connected to the displacement control mechanism, the displacement control mechanism being capable of driving the second stretching mechanism to move along a first straight line direction to move away from or closer to the first stretching mechanism, the first stretching mechanism and the second stretching mechanism being respectively used to fix two ends of the object to be measured; A high-temperature environment providing device, the high-temperature environment providing device having a test cavity that is bidirectionally connected along a second linear direction. When the high-temperature environment providing device is in a working position, the first linear direction is aligned with the second linear direction, and the object to be tested fixed by the first and second stretching mechanisms can be placed in the test cavity. The measuring component includes an optical fiber sensor and a demodulator connected to the optical fiber sensor. The optical fiber sensor can be connected to the object to be measured fixed by the first stretching mechanism and the second stretching mechanism.

[0008] Furthermore, the device base includes a first stand and a second stand arranged at an interval from each other, the displacement control mechanism includes two parallel guide rails and a sliding beam slidably disposed between the two guide rails, the two ends of the guide rails are respectively connected to the first stand and the second stand, and the length direction of the guide rails is parallel to the first straight line direction; The first end of the first stretching mechanism is connected to the first stand, the first end of the second stretching mechanism is connected to the sliding beam, the second end of the first stretching mechanism and the second end of the second stretching mechanism face each other, and the second end of the first stretching mechanism is used to fix one end of the object to be measured, and the second end of the second stretching mechanism is used to fix the other end of the object to be measured.

[0009] Furthermore, the high temperature strain testing equipment includes a lifting drive mechanism installed on the equipment base, the high temperature environment providing device is arranged on the lifting drive mechanism, and the lifting drive mechanism can drive the high temperature environment providing device to move to the working position.

[0010] Furthermore, the high temperature environment providing device is a high temperature graphite furnace.

[0011] Furthermore, the guide rail is an electric guide rail.

[0012] Furthermore, the guide rail is provided with a scale extending along the length direction of the guide rail.

[0013] Furthermore, the high temperature strain testing equipment includes a force sensor, which is connected to the sliding beam and the second stretching mechanism.

[0014] Furthermore, the first stretching mechanism includes a first clamp and a first extended stretching plate, and the second stretching mechanism includes a second clamp and a second extended stretching plate. The two ends of the first clamp are respectively connected to the first stand and the first extended stretching plate, and the two ends of the second clamp are respectively connected to the sliding beam and the second extended stretching plate. The first extended stretching plate and the second extended stretching plate are respectively used to fix the two ends of the object to be measured.

[0015] Furthermore, the first extended stretch plate and the second extended stretch plate both have threaded fastener mounting holes, so that the first extended stretch plate and the second extended stretch plate can be connected to the object to be measured through threaded fasteners.

[0016] In addition, the present invention further provides a high-temperature strain testing method, comprising the above-mentioned high-temperature strain testing apparatus, wherein the high-temperature strain testing method includes multiple optical fiber sensor arrangement methods, wherein the multiple optical fiber sensor arrangement methods include at least one of a point-type temperature strain measurement adaptation connection method, a line-type temperature strain measurement adaptation connection method, and a surface-type temperature strain measurement adaptation connection method; The point-type temperature strain measurement adaptation connection method comprises connecting the optical fiber sensor to two connection points on the object to be measured fixed by the first stretching mechanism and the second stretching mechanism; The linear temperature strain measurement adaptation connection method includes connecting the optical fiber sensor to multiple point groups on the object to be measured fixed by the first stretching mechanism and the second stretching mechanism, each point group includes two connection points, and the connection points in all point groups are on the same straight line; The surface temperature strain measurement adaptation connection method connects the optical fiber sensor to a point group array on the object to be measured fixed by the first stretching mechanism and the second stretching mechanism. The point group array includes multiple rows of point groups, each row of point groups includes multiple columns of point groups, each point group includes two connection points, and the optical fiber sensor extends along an S shape to pass through the two connection points in each point group in sequence.

[0017] The beneficial effects of the high temperature strain testing equipment provided by the present invention are: Compared to existing technologies, the high-temperature strain testing equipment provided by the present invention utilizes an optical fiber sensor connected to the object to be tested, secured by the first and second stretching mechanisms, to simultaneously measure both the temperature and strain of the object. The use of this key component, the optical fiber sensor, offers numerous advantages. First, the optical fiber sensor is highly adaptable to environmental conditions, operating stably in harsh environments such as high temperature, high pressure, and strong electromagnetic interference. Thermal airflow and contaminants do not affect the normal operation of the optical fiber, and the transmission of optical signals within the optical fiber is unaffected by external interference, ensuring the precision, accuracy, and reliability of temperature and strain measurements. Second, the optical fiber's compact size and flexibility enable it to flexibly adapt to various sample surface shapes. It can be laid according to actual needs, and can fit tightly to any flat surface, curved surface or complex three-dimensional structure, fully reflecting the overall deformation of the sample; third, the response speed of the fiber optic sensor is extremely fast, and it can monitor the changes in strain and temperature in real time, providing users with timely and accurate measurement data; fourth, the installation and use of the fiber optic sensor is very simple, without the need for complicated debugging process, and ordinary operators can get started after simple training, which greatly reduces the cost of use and the technical threshold; fifth, the fiber optic sensor has good durability and stability, can work in harsh environments for a long time, has a long service life, and reduces the cost and trouble of frequent equipment replacement. The sensor has a wide temperature and strain measurement range and can be applied to strain measurements of different degrees at different temperatures. Due to its small size, the fiber optic sensor is easy to install and arrange. In some scenarios where there are strict restrictions on sensor size and weight, it is very suitable for high-temperature strain measurement of tiny structures in the aerospace field. Fiber optic sensors can be installed by pasting, embedding or non-contact, and have little impact on the structure and performance of the object to be measured. In addition, multiple sensing points can be arranged on the optical fiber, and real-time in-situ simultaneous measurement of temperature and strain in point, line and surface types can be achieved. This multiplexing technology can reduce the number and cost of sensor installation, and also facilitates unified data collection and processing.

[0018] Other beneficial effects of the present invention will be described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic top view of a high-temperature strain testing device according to an embodiment of the present application; Figure 2A schematic diagram of a measuring component in a high-temperature strain testing device according to an embodiment of the present application; Figure 3 Schematic diagram of a point-type temperature strain measurement adaptation connection method in a high-temperature strain testing method according to an embodiment of the present application; Figure 4 Schematic diagram of a method for adapting and connecting a linear temperature-strain measurement in a high-temperature strain testing method according to an embodiment of the present application; Figure 5 Schematic diagram of a surface-type temperature-strain measurement adaptation connection method in a high-temperature strain testing method according to an embodiment of the present application.

[0021] Description of reference numerals: 1- Object to be measured; 2- High-temperature environment providing device; 3- Fiber optic sensor; 4- Demodulator; 5- Lifting platform; 6- Force sensor; 7- First clamp; 8- First extended stretching plate; 9- Second clamp; 10- Second extended stretching plate; 11- Threaded fastener; 12- High-temperature adhesive; 100- Equipment base; 101- First stand; 102- Second stand; 200- Displacement control mechanism; 201- Guide rail; 202- Sliding beam. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings provide exemplary embodiments of the present application, one or at least three, to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that the present application can be implemented in a variety of different forms and is not limited to the embodiments described below.

[0023] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if there are terms such as "up", "down", "left", "right", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, scheme B, or schemes in which A and B are satisfied at the same time.

[0025] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0026] See also Figure 1 and Figure 2 , provides a high temperature strain testing device, wherein the high temperature strain testing device includes: The equipment base 100, serving as the supporting infrastructure of the entire high-temperature strain testing equipment, may specifically include certain structures such as a frame, a base, and columns; A displacement control mechanism 200, a first stretching mechanism and a second stretching mechanism facing each other, the displacement control mechanism 200 being connected to the device base 100, the first stretching mechanism being connected to the device base 100, and the second stretching mechanism being connected to the displacement control mechanism 200, the displacement control mechanism 200 being capable of driving the second stretching mechanism to move along a first straight line direction away from or closer to the first stretching mechanism, the first stretching mechanism and the second stretching mechanism being respectively used to fix the two ends of the object to be measured 1; The high-temperature environment providing device 2 has a test cavity that is bidirectionally connected along the second linear direction. When the high-temperature environment providing device 2 is in the working position, the first linear direction is aligned with the second linear direction, and the object to be tested 1 fixed by the first stretching mechanism and the second stretching mechanism can be placed in the test cavity; The measuring component includes an optical fiber sensor 3 and a demodulator 4 connected to the optical fiber sensor 3. The demodulator 4 can obtain the signal of the optical fiber sensor 3, thereby realizing the demodulation of the temperature and strain information of the object to be measured 1. The optical fiber sensor 3 can be connected to the object to be measured 1 fixed by the first stretching mechanism and the second stretching mechanism. Specifically, the optical fiber sensor 3 can be connected (installed) to the object to be measured 1 by pasting (bonding), embedding or non-contact connection.

[0027] Because the high-temperature strain testing apparatus provided by the present invention utilizes an optical fiber sensor 3 connected to an object 1 secured by the first and second stretching mechanisms to simultaneously measure both temperature and strain on the object 1, the use of this crucial component offers numerous advantages. First, the optical fiber sensor 3 is highly adaptable to environmental conditions, operating stably in harsh environments such as high temperature, high pressure, and strong electromagnetic interference. Thermal airflow and contaminants do not affect the normal operation of the optical fiber, and the transmission of optical signals within the optical fiber is unaffected by external interference, ensuring the precision, accuracy, and reliability of temperature and strain measurements. Second, the optical fiber's compact size and flexibility enable it to flexibly adapt to various sample surface shapes. It can be laid according to actual needs, and can fit tightly to any plane, curved surface or complex three-dimensional structure, fully reflecting the overall deformation of the sample; third, the response speed of the optical fiber sensor 3 is extremely fast, and it can monitor the changes in strain and temperature in real time, providing users with timely and accurate measurement data; fourth, the installation and use of the optical fiber sensor 3 is very simple, and no complicated debugging process is required. Ordinary operators can get started after simple training, which greatly reduces the cost of use and the technical threshold; fifth, the optical fiber sensor 3 has good durability and stability, can work in harsh environments for a long time, and has a long service life, which reduces the cost and trouble of frequent equipment replacement. The temperature and strain measurement range of the device 3 is large, and it can be applied to strain measurements of different degrees at different temperatures. Due to its small size, the optical fiber sensor 3 is easy to install and arrange. In some scenarios where there are strict restrictions on the size and weight of sensors, it is very suitable for high-temperature strain measurement of tiny structures in the aerospace field. The optical fiber sensor 3 can be installed by pasting, embedding or non-contact, and has a relatively small impact on the structure and performance of the object to be measured 1. In addition, multiple sensing points can be arranged on the optical fiber, and real-time in-situ simultaneous measurement of temperature and strain in point, line and surface types can be achieved. This multiplexing technology can reduce the number and cost of sensor installations, and also facilitates unified data collection and processing.

[0028] According to one embodiment of the present invention, a device base 100 includes a first stand 101 and a second stand 102 spaced apart from each other. A displacement control mechanism 200 includes two parallel guide rails 201 and a sliding beam 202 slidably disposed between the two guide rails 201. The ends of the guide rails 201 are connected to the first stand 101 and the second stand 102, respectively. The length direction of the guide rails 201 is parallel to the first straight line direction. The first end of the first stretching mechanism is connected to the first stand 101, the first end of the second stretching mechanism is connected to the sliding beam 202, the second end of the first stretching mechanism and the second end of the second stretching mechanism face each other, and the second end of the first stretching mechanism is used to fix one end of the object to be measured 1, and the second end of the second stretching mechanism is used to fix the other end of the object to be measured 1.

[0029] The displacement control mechanism 200 may specifically be an extensometer, or other similar mechanisms.

[0030] According to one embodiment of the present application, the high-temperature strain testing equipment includes a lifting drive mechanism installed on the equipment base 100, and the high-temperature environment providing device 2 is arranged on the lifting drive mechanism. The lifting drive mechanism can drive the high-temperature environment providing device 2 to move to a working position. The lifting drive mechanism specifically includes a lifting drive actuator and a lifting platform 5 arranged above the lifting drive actuator. The high-temperature environment providing device 2 is installed on the lifting platform 5. The lifting drive actuator can be a cylinder, a hydraulic cylinder or a scissors lifting mechanism, etc. The lifting drive mechanism can drive the high-temperature environment providing device 2 to rise and fall so that it reaches a suitable height so that the first straight line direction is aligned with the second straight line direction, so that the high-temperature environment providing device 2 is in a working position. At this time, the object to be tested 1 fixed by the first stretching mechanism and the second stretching mechanism can be placed in the test cavity, and the first stretching mechanism and the second stretching mechanism cooperate to perform the stretching operation on the object to be tested 1 without being interfered with by the high-temperature environment providing device 2. The lifting direction of the lifting drive actuator is perpendicular to the first straight line direction (and perpendicular to the second straight line direction). For example, when the first straight line direction and the second straight line direction are horizontal, the lifting direction of the lifting drive actuator is vertical.

[0031] In addition, in order to more accurately adjust the position of the high temperature environment providing device 2, the lifting drive mechanism can also be connected to a transverse moving mechanism, and the moving direction of the transverse moving mechanism is perpendicular to the lifting direction of the lifting drive actuator.

[0032] According to a specific embodiment of the present application, the high temperature environment providing device 2 is a high temperature graphite furnace, and the test cavity is a tube cavity of the high temperature graphite furnace.

[0033] Of course, as other embodiments, the high temperature environment providing device 2 may also be other high temperature furnaces besides the high temperature graphite furnace, or the high temperature environment providing device 2 may also be replaced by an electric heating tube or other devices.

[0034] According to one embodiment of the present application, the guide rail 201 is an electric guide rail, which can directly drive the sliding beam 202 to move along the first straight line direction, so that the second stretching mechanism moves along the first straight line direction to move away from or closer to the first stretching mechanism, thereby stretching the object to be measured 1 fixed by the first stretching mechanism and the second stretching mechanism.

[0035] As another embodiment, the guide rail 201 may also be a mechanical guide rail (manual operation is required) that only has a guiding function. In this case, other additional devices may be used to drive the sliding beam 202 to move along the first straight line direction.

[0036] According to one embodiment of the present application, the guide rail 201 is provided with a scale extending along the length direction of the guide rail 201, and the scales on the scale are also arranged along the length direction of the guide rail 201, so as to facilitate intuitively obtaining the tensile displacement of the object to be measured 1 through the position change of the sliding beam 202 relative to the scale.

[0037] According to one embodiment of the present application, the high temperature strain testing device includes a force sensor 6 , which is connected to the sliding beam 202 and the second stretching mechanism to detect the stretching force value of the object to be tested 1 .

[0038] According to one embodiment of the present application, a first stretching mechanism includes a first clamp 7 and a first extended stretching plate 8, and a second stretching mechanism includes a second clamp 9 and a second extended stretching plate 10. The first clamp 7 is connected to the first stand 101 and the first extended stretching plate 8 at both ends, respectively. The second clamp 9 is connected to the sliding beam 202 and the second extended stretching plate 10 at both ends. The first extended stretching plate 8 and the second extended stretching plate 10 are respectively used to fix the ends of the object to be tested 1. The first extended stretching plate 8 and the second extended stretching plate 10 both have mounting holes for threaded fasteners 11, so that the first extended stretching plate 8 and the second extended stretching plate 10 can be connected to the object to be tested 1 via threaded fasteners 11 (bolts and nuts). The design of the first extended stretching plate 8 and the second extended stretching plate 10 for connecting and fixing the object to be tested 1 is very suitable for fixing plate-like objects to be tested 1. Of course, the present application can design appropriate shapes of the first and second stretching mechanisms according to the specific shape of the object to be tested 1, so that the first and second stretching mechanisms can connect and fix objects to be tested 1 of various shapes.

[0039] In addition, see Figures 1 to 5 , see especially Figures 3 to 5 The present invention further provides a high-temperature strain testing method, comprising the above-mentioned high-temperature strain testing device, wherein the high-temperature strain testing method includes multiple optical fiber sensor 3 connection methods, wherein the multiple optical fiber sensor 3 connection methods include at least one of a point-type temperature strain measurement adaptation connection method, a line-type temperature strain measurement adaptation connection method, and a surface-type temperature strain measurement adaptation connection method; The point-type temperature strain measurement adaptation connection method includes connecting the optical fiber sensor 3 to two connection points on the object to be measured 1 fixed by the first stretching mechanism and the second stretching mechanism; The linear temperature strain measurement adaptation connection method includes connecting the optical fiber sensor 3 to multiple point groups on the object to be measured 1 fixed by the first stretching mechanism and the second stretching mechanism, for example, three point groups, each point group includes two connection points, and the connection points in all point groups are on the same straight line; The surface temperature and strain measurement adaptation connection method connects the optical fiber sensor 3 to an array of point groups on the object to be measured 1, which is fixed by the first and second stretching mechanisms. The point group array includes multiple rows of point groups, for example, three rows of point groups. Each row of point groups includes multiple columns of point groups, for example, three columns of point groups. Each point group includes two connection points. The optical fiber sensor 3 extends in an S-shape, sequentially passing through the two connection points in each point group. This high-temperature strain testing method uses the optical fiber sensor as a reference standard sensor and can be used to test temperature and strain and provide reference values. The temperature and strain of the object to be measured can be tested at single or multiple points. It is understood that the sensor arrangement methods (methods) include, but are not limited to, the following: The various optical fiber sensor arrangement methods include a point temperature and strain measurement adaptation connection method, a line temperature and strain measurement adaptation connection method, and a surface temperature and strain measurement adaptation connection method.

[0040] The optical fiber sensor 3 can be bonded to the object to be measured 1 using high-temperature adhesive 12 (but not limited to high-temperature adhesive 12). Different bonding methods of the optical fiber sensor 3 can achieve real-time in-situ measurement of temperature and strain dual parameters of the optical fiber sensor 3 in point, line, or surface configurations.

[0041] It should be noted that the above embodiments merely represent preferred implementations of the present application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the present application. It should be noted that those skilled in the art may, without departing from the spirit of the present application, make various modifications and improvements, such as combining different features from the various embodiments, and all of these modifications and improvements should fall within the scope of protection of the present application.

Claims

1. A high temperature strain testing device, characterized in that: The high temperature strain testing equipment comprises: Equipment base; a displacement control mechanism, a first stretching mechanism and a second stretching mechanism facing each other, the displacement control mechanism being connected to the device base, the first stretching mechanism being connected to the device base, the second stretching mechanism being connected to the displacement control mechanism, the displacement control mechanism being capable of driving the second stretching mechanism to move along a first straight line direction to move away from or closer to the first stretching mechanism, the first stretching mechanism and the second stretching mechanism being respectively used to fix two ends of the object to be measured; A high-temperature environment providing device, the high-temperature environment providing device having a test cavity that is bidirectionally connected along a second linear direction. When the high-temperature environment providing device is in a working position, the first linear direction is aligned with the second linear direction, and the object to be tested fixed by the first and second stretching mechanisms can be placed in the test cavity. The measuring component includes an optical fiber sensor and a demodulator connected to the optical fiber sensor. The optical fiber sensor can be connected to the object to be measured fixed by the first stretching mechanism and the second stretching mechanism.

2. The high temperature strain testing device according to claim 1, characterized in that: The device base includes a first stand and a second stand spaced apart from each other, the displacement control mechanism includes two guide rails parallel to each other and a sliding beam slidably disposed between the two guide rails, the two ends of the guide rails being connected to the first stand and the second stand, respectively, and the length direction of the guide rails being parallel to the first straight line direction; The first end of the first stretching mechanism is connected to the first stand, the first end of the second stretching mechanism is connected to the sliding beam, the second end of the first stretching mechanism and the second end of the second stretching mechanism face each other, and the second end of the first stretching mechanism is used to fix one end of the object to be measured, and the second end of the second stretching mechanism is used to fix the other end of the object to be measured.

3. The high temperature strain testing device according to claim 1, characterized in that: The high-temperature strain testing equipment includes a lifting drive mechanism installed on the equipment base, the high-temperature environment providing device is arranged on the lifting drive mechanism, and the lifting drive mechanism can drive the high-temperature environment providing device to move to the working position.

4. The high temperature strain testing device according to claim 1, characterized in that: The high temperature environment providing device is a high temperature graphite furnace.

5. The high temperature strain testing device according to claim 2, characterized in that: The guide rail is an electric guide rail.

6. The high temperature strain testing device according to claim 2, characterized in that: The guide rail is provided with a scale extending along the length direction of the guide rail.

7. The high temperature strain testing device according to claim 2, characterized in that: The high temperature strain testing device includes a force sensor connected to the sliding beam and the second stretching mechanism.

8. The high temperature strain testing device according to claim 2, characterized in that: The first stretching mechanism includes a first clamp and a first extended stretching plate, and the second stretching mechanism includes a second clamp and a second extended stretching plate. The two ends of the first clamp are respectively connected to the first stand and the first extended stretching plate, and the two ends of the second clamp are respectively connected to the sliding beam and the second extended stretching plate. The first extended stretching plate and the second extended stretching plate are respectively used to fix the two ends of the object to be measured.

9. The high temperature strain testing device according to claim 8, characterized in that: The first extended stretch plate and the second extended stretch plate both have threaded fastener mounting holes, so that the first extended stretch plate and the second extended stretch plate can be connected to the object to be measured through threaded fasteners.

10. A high temperature strain testing method, comprising the high temperature strain testing device according to any one of claims 1 to 9, characterized in that: The high-temperature strain testing method includes multiple fiber optic sensor arrangement methods, wherein the multiple fiber optic sensor arrangement methods include at least one of a point-type temperature strain measurement adaptation connection method, a line-type temperature strain measurement adaptation connection method, and a surface-type temperature strain measurement adaptation connection method; The point-type temperature strain measurement adaptation connection method comprises connecting the optical fiber sensor to two connection points on the object to be measured fixed by the first stretching mechanism and the second stretching mechanism; The linear temperature strain measurement adaptation connection method includes connecting the optical fiber sensor to multiple point groups on the object to be measured fixed by the first stretching mechanism and the second stretching mechanism, each point group includes two connection points, and the connection points in all point groups are on the same straight line; The surface temperature strain measurement adaptation connection method connects the optical fiber sensor to a point group array on the object to be measured fixed by the first stretching mechanism and the second stretching mechanism. The point group array includes multiple rows of point groups, each row of point groups includes multiple columns of point groups, each point group includes two connection points, and the optical fiber sensor extends along an S shape to pass through the two connection points in each point group in sequence.

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