Material deformation measurement method and system in temperature and humidity coupling environment

Abstract

The invention discloses a material deformation measurement method and system in a temperature and humidity coupling environment. The method comprises the following steps: setting measurement parameters of an image acquisition system according to sample information; preparing a random gray level distribution image on the surface of the sample by using a black spraying material and a white spraying material to obtain a test sample; collecting sample deformation data when the test sample deforms in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment under different temperatures and humidity; and processing the sample deformation data through an image analysis algorithm to obtain a temperature and humidity-deformation relation curve so as to determine the influence of temperature and humidity on material deformation. According to the method, the accurate rule of the material deformation and the environmental factors is obtained by measuring the influence of the temperature and the humidity on the material deformation under different degrees of change, and accurate data support is provided for the preparation size of the material.

Description

Technical Field

[0001] The present application belongs to the field of material deformation measurement, and specifically relates to a material deformation measurement method and system in a temperature and humidity coupled environment. Background Art

[0002] Shrinkage, expansion, and warping are common quality issues in polymer products during manufacturing and service life due to environmental factors such as temperature and humidity. These issues can cause dimensional changes in the product, negatively impacting assembly accuracy, functional performance, and even product lifespan. Knowing in advance how environmental factors can affect shrinkage, expansion, and warping in materials or product structures is crucial. This helps R&D personnel make appropriate adjustments during the design phase, reducing defect rates and improving product quality.

[0003] Existing technologies for detecting material surface deformation include digital image correlation (DIC), an advanced optical method for contactless detection of specimen surface deformation. Its basic principle is to continuously capture the deformation process of the target area using a camera system, then use a correlation algorithm to track a subset of characteristic pixels on the specimen surface. Ultimately, the specimen deformation is calculated by identifying the displacement of these characteristic pixel subsets in the image at different times. However, existing testing methods only consider the effect of temperature on specimen deformation and fail to account for other factors, such as humidity, during the testing process. Therefore, accurately measuring material deformation while coupling multiple environmental factors is a major challenge. Summary of the Invention

[0004] This application proposes a material deformation measurement method and system in a temperature and humidity coupled environment. By measuring the impact of temperature and humidity on material deformation under different degrees of change, the accurate law of material deformation and environmental factors is obtained, providing accurate data support for the preparation size of the material.

[0005] A first aspect of the present application provides a method for measuring material deformation in a temperature-humidity coupling environment, the method comprising:

[0006] Set the measurement parameters of the image acquisition system according to the sample information;

[0007] Use black spray material and white spray material to prepare random grayscale distribution images on the surface of the sample to obtain the test sample;

[0008] Collecting deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment at different temperatures and humidities;

[0009] The sample deformation data is processed by image analysis algorithm to obtain the temperature-humidity-deformation relationship curve to determine the influence of temperature and humidity on material deformation.

[0010] The above scheme first prepares a high-contrast random grayscale distribution image by spraying black and white spray materials on the surface of the sample, which can more clearly show the deformation of the sample through pixels in different areas in subsequent experiments; then the sample is fixed in a sealed temperature chamber, and the effects of changes in temperature and humidity on the sample deformation are measured by adjusting the humidity while keeping the temperature constant, adjusting the temperature while keeping the humidity constant, and adjusting both the temperature and humidity. The deformation of the test sample is recorded through an image acquisition system to obtain clear sample deformation data related to both temperature and humidity; finally, the relationship curve between temperature, humidity and sample deformation is constructed through the sample deformation data to obtain the corresponding sample deformation amounts under different temperature and humidity environments, providing accurate data support for material research and development.

[0011] In a possible implementation method of the first aspect, measurement parameters of the image acquisition system are set according to the sample information, specifically:

[0012] According to the size of the sample, adjust the relative positions of the cameras in the image acquisition system and the shooting parameters.

[0013] The above solution adjusts the relative positions of the cameras according to the size of the sample, ensuring that each camera can accurately and simultaneously capture the sample, thereby improving the accuracy of the collected data.

[0014] In a possible implementation method of the first aspect, a random grayscale distribution image is prepared on the surface of a sample using black spray material and white spray material to obtain a test sample, specifically as follows:

[0015] Clean the sample surface and determine the spraying order according to actual needs;

[0016] When the spraying order is black first and then white, a black paint film is first sprayed on the surface of the sample using black spray material, and then white spray material is randomly sprayed on the black paint film to obtain a test sample with black background and white random speckles;

[0017] When the spraying order is white first and then black, a layer of white paint film is sprayed on the sample using white spray material, and then black spray material is randomly sprayed on the white paint film to obtain a test sample with random black speckles on a white background.

[0018] The above scheme prepares random grayscale distribution images of spray materials with high black and white color contrast. Because the pixels in different areas of the image are different, the deformation of different areas of the sample surface can be more clearly observed through different pixel displacements during subsequent image analysis.

[0019] In a possible implementation method of the first aspect, before collecting deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment, the method further includes:

[0020] Determine the fixing method of the test specimen according to actual needs and fix the test specimen;

[0021] Wherein, the fixing methods include vertical clamping and horizontal placement.

[0022] In a possible implementation method of the first aspect, collecting deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment is specifically as follows:

[0023] Set the initial temperature and humidity in the temperature chamber, and record the current size information of the test specimen through the image acquisition system;

[0024] Only the temperature in the temperature box is adjusted and the deformation of the test specimen is recorded through the image acquisition system to obtain the temperature deformation data;

[0025] Only the humidity in the temperature chamber is adjusted and the deformation of the test specimen is recorded through the image acquisition system to obtain humidity deformation data;

[0026] At the same time, the temperature and humidity in the temperature chamber are adjusted and the deformation of the test specimen is recorded through the image acquisition system to obtain temperature-humidity coupled deformation data;

[0027] The sample deformation data is obtained according to the current size information, the temperature deformation data, the humidity deformation data and the temperature-humidity coupled deformation data.

[0028] The above scheme measures the influence of temperature on material deformation, the influence of humidity on material deformation, and the influence of temperature and humidity coupling on material deformation by adjusting only temperature, only humidity, and both temperature and humidity, respectively. It takes into account the effects of multiple environmental factors and obtains a more accurate relationship between material deformation and the actual environment.

[0029] In a possible implementation method of the first aspect, only the temperature in the temperature chamber is adjusted, and the deformation of the test specimen is recorded by an image acquisition system to obtain temperature deformation data, specifically:

[0030] Starting from the initial temperature, the temperature in the temperature box is cooled or heated at a preset adjustment rate until the temperature reaches a preset first threshold value, and the deformation of the test specimen is recorded by an image acquisition system during the entire cooling or heating process to obtain temperature deformation data at different temperature points;

[0031] The temperature deformation data will be associated with the corresponding temperature points; and the humidity in the temperature box will be kept constant during the entire process of cooling or heating.

[0032] In a possible implementation method of the first aspect, only the humidity in the temperature chamber is adjusted and the deformation of the test sample is recorded by an image acquisition system to obtain humidity deformation data, specifically:

[0033] Starting from the initial humidity, the humidity in the temperature chamber is increased or decreased at a preset adjustment rate until the humidity reaches a preset second threshold value, and the deformation of the test specimen is recorded by an image acquisition system during the entire process of increasing or decreasing the humidity to obtain humidity deformation data at different humidity points;

[0034] The humidity deformation data will be associated with the corresponding humidity points; and the temperature in the temperature box will be kept constant during the entire process of increasing or decreasing the humidity.

[0035] In a possible implementation method of the first aspect, the temperature and humidity in the temperature chamber are simultaneously adjusted, and the deformation of the test specimen is recorded by an image acquisition system to obtain temperature-humidity coupled deformation data, specifically:

[0036] According to actual needs, the preset humidity range is divided into several humidity points;

[0037] For each of the humidity points, the humidity in the temperature box is controlled to remain unchanged at one of the humidity points, the temperature in the temperature box is adjusted within a preset temperature range, and the deformation of the test specimen is recorded through an image acquisition system during the entire process of adjusting the temperature until the temperature-humidity coupled deformation data corresponding to all of the humidity points are obtained; wherein, when the entire process of adjusting the temperature is completed at one of the humidity points, the humidity is adjusted to another humidity point.

[0038] The above scheme first fixes the humidity, then adjusts the temperature change within the fixed humidity to record the relationship between the sample deformation and temperature at the humidity point, and then switches to different humidity points to record the temperature-humidity coupled deformation data at each humidity point. It can record the deformation of the sample under the joint action of humidity and temperature, and provide accurate data support for the subsequent construction of the relationship curve between temperature, humidity and sample deformation.

[0039] In a possible implementation method of the first aspect, the sample deformation data is processed by an image analysis algorithm to obtain a temperature-humidity-deformation relationship curve, specifically:

[0040] The sample deformation data is processed by an image analysis algorithm to determine the first relationship between temperature and test sample deformation, the second relationship between humidity and test sample deformation, and the third relationship between temperature change and test sample deformation at different humidity levels.

[0041] A second aspect of the present application provides a material deformation measurement system in a temperature and humidity coupled environment, the system comprising: a measurement preparation module, a sample preparation module, a deformation data acquisition module, and a deformation influence curve generation module;

[0042] Among them, the measurement preparation module is used to set the measurement parameters of the image acquisition system according to the sample information;

[0043] The sample preparation module is used to prepare a random grayscale distribution image on the sample surface using black spray material and white spray material to obtain a test sample;

[0044] The deformation data acquisition module is used to acquire deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment at different temperatures and humidities;

[0045] The deformation influence curve generation module is used to process the sample deformation data through image analysis algorithm to obtain the temperature and humidity-deformation relationship curve to determine the influence of temperature and humidity on material deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0047] Figure 1 This is a schematic diagram of a specific process of a material deformation measurement method under a temperature and humidity coupling environment provided by a certain embodiment of the present application;

[0048] Figure 2 This is a schematic diagram of sample fixing in a method for measuring material deformation under a temperature-humidity coupling environment provided by one embodiment of the present application;

[0049] Figure 3 This is a simplified diagram of a measurement system for a material deformation measurement method in a temperature-humidity coupling environment provided by one embodiment of the present application;

[0050] Figure 4 This is a sample deformation cloud diagram of a material deformation measurement method under a temperature and humidity coupling environment provided in a certain embodiment of the present application;

[0051] Figure 5 This is a temperature-humidity fitting curve of a material deformation measurement method under a temperature-humidity coupling environment provided in a certain embodiment of the present application;

[0052] Figure 6 This is a structural diagram of a material deformation measurement system in a temperature and humidity coupling environment provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] It should be understood that the step numbers used herein are only for convenience of description and are not intended to limit the order in which the steps are to be executed.

[0055] First embodiment

[0056] Based on the natural principles of thermal expansion and contraction, polymer products often experience common quality issues during production, such as expansion, contraction, or warping, due to factors like temperature and humidity. This can negatively impact product assembly precision, functionality, and even product lifespan. Therefore, how to adjust polymer products based on the impact of these various natural factors on polymer materials, thereby reducing product defect rates and improving product quality, remains a pressing challenge.

[0057] like Figure 1 As shown, Figure 1 A specific flow chart of a method for measuring material deformation under a temperature-humidity coupling environment is provided for one embodiment of the present application. The method for measuring material deformation under a temperature-humidity coupling environment of this embodiment includes steps S1 to S4, which are described in detail as follows:

[0058] Step S1: setting measurement parameters of the image acquisition system according to sample information.

[0059] In the embodiment of the present application, the measurement parameters of the image acquisition system are first calibrated through a calibration component.

[0060] The image acquisition system is composed of two or more CCD cameras. The measurement module of the image acquisition system is calibrated according to preset measurement parameters using a standard calibration plate. Generally, the relative position between the cameras, the focal length and aperture of the cameras, etc. are calibrated.

[0061] For example, in the embodiment of the present application, a DIC test device is used as the image acquisition system to measure the sample. The DIC device is composed of two cameras. Before measurement, the relative positions of the two cameras need to be adjusted according to the size information of the sample, including the relative distance and relative angle between the two cameras, to ensure that the sample can be photographed by the two cameras at the same time. Then adjust the focal length and aperture of the two cameras so that the speckle in the random grayscale distribution image on the surface of the sample is clear and bright, and the collected image is convenient for subsequent observation and calculation analysis. After adjusting the position and parameters of the camera, the image acquisition system composed of the two cameras is calibrated. Generally, a standard calibration plate is used for calibration. By taking images of the calibration plate at different angles, the relative distance, relative angle and pitch angle of the two cameras are calculated by calculation software to complete the preparation work before measurement.

[0062] Step S2: using black spray material and white spray material to prepare a random grayscale distribution image on the surface of the sample to obtain a test sample.

[0063] In an embodiment of the present application, the sample surface is first cleaned, and then the sample surface is sprayed with a spray material to prepare a high-contrast random grayscale distribution image.

[0064] Generally, black and white spray materials are used to spray the surface of the sample because the contrast between these two colors is high. Similarly, in other embodiments, other colors with high contrast can also be used to prepare random grayscale distribution images, as long as the speckle and the bottom surface can be clearly distinguished.

[0065] After cleaning the sample surface, evenly spray black matte paint onto it, forming a uniform black film. Next, randomly spray white matte paint onto the black film using white paint. This creates a high-contrast random grayscale distribution pattern with white speckles on a black background. Allow the sample to air dry and set aside. This will yield a test sample with a random grayscale distribution pattern.

[0066] Alternatively, in other implementations, the spraying order can be reversed. First, a white matte spray material is evenly sprayed on the sample surface to form a uniform white paint film. Then, a black spray material is randomly sprayed on the white paint film to form a high-contrast random grayscale distribution image of random black speckles on a white background.

[0067] The purpose of spraying speckles on the sample surface is to ensure that the pixel features of each area in the random grayscale distribution image are unique when the sample deformation image is subsequently analyzed, which is more conducive to the calculation of the sample deformation.

[0068] Step S3, collecting deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment at different temperatures and humidities.

[0069] In the embodiment of the present application, the test sample is first fixed in a sealed temperature chamber. There are two main fixing methods: vertical clamping and horizontal placement. Figure 2 A schematic diagram of sample fixation in an embodiment of the present application is provided. The left side shows vertical clamping, in which the test sample is clamped vertically relative to the bottom surface of the temperature chamber by a fixture clamp and placed in the center of the bottom surface of the temperature chamber; the right side shows horizontal placement, in which the test sample is directly placed horizontally in the center of the bottom surface of the temperature chamber without using a fixture clamp, as long as the test sample does not easily move during the subsequent measurement process.

[0070] Then set the initial temperature and initial humidity in the temperature box. In the embodiment of the present application, the initial temperature is set to 145°C and the initial humidity is set to 45%. Generally, the selection of the initial temperature and initial humidity is in line with the room temperature and normal humidity of the current environment. Then, the temperature is raised, lowered, and the humidity is adjusted according to the measurement requirements to simulate extreme conditions that may occur during the production process, so as to observe the degree of deformation of the sample under extreme conditions. In addition, when the temperature box is at the initial temperature and initial humidity, the current size information of the test sample is also recorded by the image acquisition system to obtain the initial sample data.

[0071] There are three main types of control for temperature and humidity in the temperature chamber: adjusting only the temperature without adjusting the humidity, adjusting only the humidity without adjusting the temperature, and adjusting both the temperature and humidity. In this way, we can obtain temperature deformation data that only considers the influence of temperature, humidity deformation data that only considers the influence of humidity, and temperature and humidity coupled deformation data that considers the influence of both humidity and temperature.

[0072] Among them, the sample deformation data is a general term for the above-mentioned temperature deformation data, humidity deformation data and temperature and humidity coupled deformation data. It is the deformation of the sample compared with its initial shape during the entire process of adjusting the temperature or humidity from the initial temperature or initial humidity to the set threshold under a preset temperature and humidity coupled environment. In this process, the deformation of the sample compared with its initial shape at each temperature point or humidity point is recorded to obtain the sample deformation data at different temperature points or humidity points.

[0073] When considering only temperature effects, the humidity level within the temperature chamber is maintained constant, and the test specimen is subjected to temperature changes by either increasing or decreasing the temperature, depending on the measurement requirements. This temperature increase or decrease can be programmed to decrease or increase the temperature from an initial temperature at a predetermined rate. Temperature adjustment ceases when the chamber temperature reaches a predetermined first threshold. Throughout the entire temperature adjustment process, the deformation of the test specimen is recorded using an image acquisition system, generating temperature-deformation data at different temperature points.

[0074] Specifically, during the entire process of adjusting the temperature, the temperature box can also output a temperature-time relationship curve. Combined with the photo shooting time output by the camera during the shooting process, the temperature can be associated with the deformation photos of the test specimen at different times to obtain the temperature deformation data at different temperature points.

[0075] When considering only the effect of humidity, the temperature within the temperature chamber is maintained stable, and the humidity is applied to the test specimen by increasing or decreasing the chamber's humidity according to test requirements. This increase or decrease in humidity can be programmed, starting from an initial humidity level and increasing or decreasing it at a predetermined rate. Humidity adjustment ceases when the chamber's humidity reaches a predetermined second threshold. Throughout the adjustment process, the deformation of the test specimen is recorded using an image acquisition system to obtain humidity-induced deformation data at different humidity points.

[0076] Specifically, during the entire process of adjusting the humidity, the temperature box can also output a curve of the relationship between humidity and time. Combined with the photo shooting time output by the camera during the shooting process, the humidity can be associated with the deformation photos of the test sample at different times to obtain the humidity deformation data at different humidity points.

[0077] When considering temperature and humidity together, one environmental factor is stabilized first, and then the other is adjusted to study the coupling effect of multiple environmental factors on material deformation. In this embodiment, the humidity is stabilized first, and then the temperature is adjusted. In other embodiments, the temperature can also be stabilized first and then the humidity can be adjusted while the temperature remains constant.

[0078] Specifically, the preset humidity range is divided into several humidity points, and then the humidity in the temperature box is stabilized at a certain humidity point and the temperature is adjusted until the temperature change meets the preset temperature range. Then, it is switched to another humidity point, the temperature is adjusted again and measured, so as to obtain the corresponding temperature-humidity coupled deformation data under all combinations of humidity points and temperature points.

[0079] For example, if the humidity range is set to 20% to 80%, then 7 humidity points can be obtained, including 20%, 30%, 40%, 50%, 60%, 70% and 80%. The temperature range is set to 25℃ to 100℃. First, the humidity in the temperature box is controlled to be stable at 20%, and then the temperature is increased from 25℃ to 100℃ according to the predetermined adjustment rate. During the whole process of heating, the deformation of the test sample is recorded by the image acquisition system to obtain the sample deformation data at different temperature points under 20% humidity. Then, the humidity is increased to 30%, and the above heating process is repeated to obtain the temperature-humidity coupled deformation data at all humidity points.

[0080] In order to better demonstrate the measurement process of specimen deformation, Figure 3 A simplified diagram of the measurement system is provided. It shows the environment inside the temperature chamber. The image acquisition system at the top records the specimen deformation image. The shaded area below is the temperature and humidity control system, which regulates the temperature and humidity inside the temperature chamber. The unshaded area below is the test specimen.

[0081] Figure 4 This is a deformation cloud diagram of the test sample during the measurement process, showing the deformation of a test sample under the coupling of temperature 140°C and humidity 45%.

[0082] Step S4: Processing the sample deformation data by an image analysis algorithm to obtain a temperature-humidity-deformation relationship curve to determine the effects of temperature and humidity on material deformation.

[0083] In the embodiment of the present application, the sample deformation data is processed by an image analysis algorithm. Based on the initial sample data, the deformation variables of the test sample at different temperature points and the deformation variables of the test sample at different humidity points are first obtained. Then, based on the above relationship and combined with the temperature and humidity coupled deformation data, the relationship between temperature, humidity and deformation is deduced, and the relationship is fitted by a quadratic surface function to obtain a three-dimensional surface function. In the three-dimensional surface function, the deformation variable corresponding to any [temperature, humidity] point within the preset temperature and humidity range can be obtained by interpolation, such as Figure 5 As shown in the figure, the horizontal axis represents humidity, the vertical axis represents deformation, and the depth axis represents temperature. Figure 5 By determining the humidity as RH2 and the temperature as T2, the corresponding deformation amount can be determined.

[0084] By constructing a quadratic surface function that represents the temperature, humidity, and deformation relationship, we can estimate the possible deformation of industrial products corresponding to the sample material under extreme working environments and whether the deformation will cause adverse effects on the industrial products, providing accurate data support for improving the stability and service life of polymer material products during service.

[0085] The implementation of the embodiments of the present application has the following beneficial effects:

[0086] In the embodiment of the present application, a high-contrast random grayscale distribution image is first prepared by spraying black and white spray materials on the surface of the sample, which can more clearly show the deformation of the sample through pixels in different areas in subsequent experiments; then the sample is fixed in a sealed temperature box, and the effects of changes in temperature and humidity on the deformation of the sample are measured by adjusting the humidity while keeping the temperature constant, adjusting the temperature while keeping the humidity constant, and adjusting both the temperature and humidity. The deformation of the test sample is recorded through an image acquisition system to obtain clear sample deformation data related to both temperature and humidity; finally, a relationship curve between temperature, humidity and sample deformation is constructed through the sample deformation data to obtain the corresponding sample deformation amounts under different temperature and humidity environments, providing accurate data support for material research and development.

[0087] Second embodiment

[0088] Furthermore, in order to implement the material deformation measurement system in the temperature and humidity coupling environment corresponding to the above method embodiment to achieve the corresponding functions and technical effects, Figure 6 A structural diagram of a material deformation measurement system under a temperature and humidity coupling environment is provided. For ease of illustration, only the parts relevant to this embodiment are shown. The material deformation measurement system under a temperature and humidity coupling environment provided in this embodiment of the application includes:

[0089] The measurement preparation module 201 is used to set measurement parameters of the image acquisition system according to the sample information.

[0090] In the embodiment of the present application, the measurement parameters of the image acquisition system are first calibrated through a calibration component.

[0091] The image acquisition system is composed of two or more CCD cameras. The measurement module of the image acquisition system is calibrated according to preset measurement parameters using a standard calibration plate. Generally, the relative position between the cameras, the focal length and aperture of the cameras, etc. are calibrated.

[0092] For example, in the embodiment of the present application, a DIC test device is used as the image acquisition system to measure the sample. The DIC device is composed of two cameras. Before measurement, the relative positions of the two cameras need to be adjusted according to the size information of the sample, including the relative distance and relative angle between the two cameras, to ensure that the sample can be photographed by the two cameras at the same time. Then adjust the focal length and aperture of the two cameras so that the speckle in the random grayscale distribution image on the surface of the sample is clear and bright, and the collected image is convenient for subsequent observation and calculation analysis. After adjusting the position and parameters of the camera, the image acquisition system composed of the two cameras is calibrated. Generally, a standard calibration plate is used for calibration. By taking images of the calibration plate at different angles, the relative distance, relative angle and pitch angle of the two cameras are calculated by calculation software to complete the preparation work before measurement.

[0093] The sample preparation module 202 is used to prepare a random grayscale distribution image on the sample surface using black spray material and white spray material to obtain a test sample.

[0094] In the embodiment of the present application, the sample surface is cleaned and the spraying order is determined according to actual needs.

[0095] When the spraying order is black first and then white, a black paint film is first sprayed on the surface of the sample using black spray material, and then white spray material is randomly sprayed on the black paint film to obtain a test sample with black background and white random speckles.

[0096] When the spraying order is white first and then black, a layer of white paint film is sprayed on the sample using white spray material, and then black spray material is randomly sprayed on the white paint film to obtain a test sample with random black speckles on a white background.

[0097] The deformation data acquisition module 203 is used to acquire deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment at different temperatures and humidities.

[0098] In an embodiment of the present application, a fixing method of the test sample is determined according to actual needs and the test sample is fixed; wherein, the fixing method includes vertical clamping and horizontal placement.

[0099] Set the initial temperature and humidity in the temperature chamber, and record the current size information of the test specimen through the image acquisition system.

[0100] Only the temperature in the temperature box is adjusted and the deformation of the test sample is recorded through the image acquisition system to obtain the temperature deformation data.

[0101] Only the humidity in the temperature chamber is adjusted and the deformation of the test sample is recorded through the image acquisition system to obtain humidity deformation data.

[0102] At the same time, the temperature and humidity in the temperature box are adjusted and the deformation of the test sample is recorded through the image acquisition system to obtain temperature and humidity coupled deformation data.

[0103] The sample deformation data is obtained according to the current size information, the temperature deformation data, the humidity deformation data and the temperature-humidity coupled deformation data.

[0104] The deformation influence curve generation module 204 is used to process the sample deformation data through an image analysis algorithm to obtain a temperature-humidity-deformation relationship curve to determine the influence of temperature and humidity on material deformation.

[0105] In an embodiment of the present application, the deformation data of the sample is processed by an image analysis algorithm. Based on the initial sample data, the deformation variables of the test sample at different temperature points and the deformation variables of the test sample at different humidity points are first obtained. Then, based on the above relationship and combined with the temperature and humidity coupled deformation data, the relationship between temperature, humidity and deformation is deduced, and the relationship is fitted by a quadratic surface function to obtain a three-dimensional surface function. In the three-dimensional surface function, the deformation variable corresponding to any [temperature, humidity] point within the preset temperature and humidity range can be obtained by interpolation. By constructing a quadratic surface function representing the temperature, humidity and deformation relationship, it is possible to estimate the deformation that may occur in the industrial product corresponding to the sample material under extreme working conditions and whether the deformation will cause adverse effects on the industrial product, thereby providing accurate data support for improving the stability and service life of polymer material products during service.

[0106] In some embodiments, the sample preparation module 202 is specifically:

[0107] First, the sample surface is cleaned, and then the sample surface is sprayed with a spray material to prepare a high-contrast random grayscale distribution image.

[0108] Generally, black and white spray materials are used to spray the surface of the sample because the contrast between these two colors is high. Similarly, in other embodiments, other colors with high contrast can also be used to prepare random grayscale distribution images, as long as the speckle and the bottom surface can be clearly distinguished.

[0109] After cleaning the sample surface, evenly spray black matte paint onto it, forming a uniform black film. Next, randomly spray white matte paint onto the black film using white paint. This creates a high-contrast random grayscale distribution pattern with white speckles on a black background. Allow the sample to air dry and set aside. This will yield a test sample with a random grayscale distribution pattern.

[0110] Alternatively, in other implementations, the spraying order can be reversed. First, a white matte spray material is evenly sprayed on the sample surface to form a uniform white paint film. Then, a black spray material is randomly sprayed on the white paint film to form a high-contrast random grayscale distribution image of random black speckles on a white background.

[0111] The purpose of spraying speckles on the sample surface is to ensure that the pixel features of each area in the random grayscale distribution image are unique when the sample deformation image is subsequently analyzed, which is more conducive to the calculation of the sample deformation.

[0112] In some embodiments, the deformation data acquisition module 203 further includes:

[0113] First, secure the test specimen in a sealed temperature chamber. There are two main securing methods: vertical clamping and horizontal placement. Vertical clamping uses fixtures to clamp the test specimen vertically relative to the chamber's bottom surface and place it in the center of the chamber's bottom surface. Horizontal placement directly places the test specimen horizontally in the center of the chamber's bottom surface without fixtures. This is acceptable as long as the test specimen does not easily shift during subsequent measurements.

[0114] Then set the initial temperature and initial humidity in the temperature box. In the embodiment of the present application, the initial temperature is set to 145°C and the initial humidity is set to 45%. Generally, the selection of the initial temperature and initial humidity is in line with the room temperature and normal humidity of the current environment. Then, the temperature is raised, lowered, and the humidity is adjusted according to the measurement requirements to simulate extreme conditions that may occur during the production process, so as to observe the degree of deformation of the sample under extreme conditions. In addition, when the temperature box is at the initial temperature and initial humidity, the current size information of the test sample is also recorded by the image acquisition system to obtain the initial sample data.

[0115] There are three main types of control for temperature and humidity in the temperature chamber: adjusting only the temperature without adjusting the humidity, adjusting only the humidity without adjusting the temperature, and adjusting both the temperature and humidity. In this way, we can obtain temperature deformation data that only considers the influence of temperature, humidity deformation data that only considers the influence of humidity, and temperature and humidity coupled deformation data that considers the influence of both humidity and temperature.

[0116] When considering only temperature effects, the humidity level within the temperature chamber is maintained constant, and the test specimen is subjected to temperature changes by either increasing or decreasing the temperature, depending on the measurement requirements. This temperature increase or decrease can be programmed to decrease or increase the temperature from an initial temperature at a predetermined rate. Temperature adjustment ceases when the chamber temperature reaches a predetermined first threshold. Throughout the entire temperature adjustment process, the deformation of the test specimen is recorded using an image acquisition system, generating temperature-deformation data at different temperature points.

[0117] Among them, the sample deformation data is a general term for the above-mentioned temperature deformation data, humidity deformation data and temperature and humidity coupled deformation data. It is the deformation of the sample compared with its initial shape during the entire process of adjusting the temperature or humidity from the initial temperature or initial humidity to the set threshold under a preset temperature and humidity coupled environment. In this process, the deformation of the sample compared with its initial shape at each temperature point or humidity point is recorded to obtain the sample deformation data at different temperature points or humidity points.

[0118] Specifically, during the entire process of adjusting the temperature, the temperature box can also output a temperature-time relationship curve. Combined with the photo shooting time output by the camera during the shooting process, the temperature can be associated with the deformation photos of the test specimen at different times to obtain the temperature deformation data at different temperature points.

[0119] When considering only the effect of humidity, the temperature within the temperature chamber is maintained stable, and the humidity is applied to the test specimen by increasing or decreasing the chamber's humidity according to test requirements. This increase or decrease in humidity can be programmed, starting from an initial humidity level and increasing or decreasing it at a predetermined rate. Humidity adjustment ceases when the chamber's humidity reaches a predetermined second threshold. Throughout the adjustment process, the deformation of the test specimen is recorded using an image acquisition system to obtain humidity-induced deformation data at different humidity points.

[0120] Specifically, during the entire process of adjusting the humidity, the temperature box can also output a curve of the relationship between humidity and time. Combined with the photo shooting time output by the camera during the shooting process, the humidity can be associated with the deformation photos of the test sample at different times to obtain the humidity deformation data at different humidity points.

[0121] When considering temperature and humidity together, one environmental factor is stabilized first, and then another is adjusted to study the coupling effect of multiple environmental factors on material deformation. In the embodiment of the present application, the humidity is stabilized first, and then the temperature change is adjusted.

[0122] Specifically, the preset humidity range is divided into several humidity points, and then the humidity in the temperature box is stabilized at a certain humidity point and the temperature is adjusted until the temperature change meets the preset temperature range. Then, it is switched to another humidity point, the temperature is adjusted again and measured, so as to obtain the corresponding temperature-humidity coupled deformation data under all combinations of humidity points and temperature points.

[0123] For example, if the humidity range is set to 20% to 80%, then 7 humidity points can be obtained, including 20%, 30%, 40%, 50%, 60%, 70% and 80%. The temperature range is set to 25℃ to 100℃. First, the humidity in the temperature box is controlled to be stable at 20%, and then the temperature is increased from 25℃ to 100℃ according to the predetermined adjustment rate. During the whole process of heating, the deformation of the test sample is recorded by the image acquisition system to obtain the sample deformation data at different temperature points under 20% humidity. Then, the humidity is increased to 30%, and the above heating process is repeated to obtain the temperature-humidity coupled deformation data at all humidity points.

[0124] In order to better demonstrate the measurement process of specimen deformation, Figure 3 A simplified diagram of the measurement system is provided. It shows the environment inside the temperature chamber. The image acquisition system at the top records the specimen deformation image. The shaded area below is the temperature and humidity control system, which regulates the temperature and humidity inside the temperature chamber. The unshaded area below is the test specimen.

[0125] The implementation of the embodiments of the present application has the following beneficial effects:

[0126] In the embodiment of the present application, a high-contrast random grayscale distribution image is first prepared by spraying black and white spray materials on the surface of the sample, which can more clearly show the deformation of the sample through pixels in different areas in subsequent experiments; then the sample is fixed in a sealed temperature box, and the effects of changes in temperature and humidity on the deformation of the sample are measured by adjusting the humidity while keeping the temperature constant, adjusting the temperature while keeping the humidity constant, and adjusting both the temperature and humidity. The deformation of the test sample is recorded through an image acquisition system to obtain clear sample deformation data related to both temperature and humidity; finally, a relationship curve between temperature, humidity and sample deformation is constructed through the sample deformation data to obtain the corresponding sample deformation amounts under different temperature and humidity environments, providing accurate data support for material research and development.

[0127] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this application. It should be understood that the above description is merely a specific embodiment of this application and is not intended to limit the scope of protection of this application. In particular, it should be noted that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A method for measuring material deformation in a temperature and humidity coupled environment, characterized in that: include: Set the measurement parameters of the image acquisition system according to the sample information; Use black spray material and white spray material to prepare random grayscale distribution images on the surface of the sample to obtain the test sample; Collecting deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment at different temperatures and humidities; The sample deformation data is processed by an image analysis algorithm to obtain a temperature-humidity-deformation relationship curve to determine the influence of temperature and humidity on material deformation.

2. The material deformation measurement method under temperature and humidity coupling environment according to claim 1, characterized in that: The measurement parameters of the image acquisition system are set according to the sample information, specifically: According to the size of the sample, adjust the relative positions of the cameras in the image acquisition system and the shooting parameters.

3. The material deformation measurement method under temperature and humidity coupling environment according to claim 1, characterized in that: The black spray material and the white spray material are used to prepare a random grayscale distribution image on the surface of the sample to obtain the test sample, specifically: Clean the sample surface and determine the spraying order according to actual needs; When the spraying order is black first and then white, a black paint film is first sprayed on the surface of the sample using black spray material, and then white spray material is randomly sprayed on the black paint film to obtain a test sample with black background and white random speckles; When the spraying order is white first and then black, a layer of white paint film is sprayed on the sample using white spray material, and then black spray material is randomly sprayed on the white paint film to obtain a test sample with random black speckles on a white background.

4. The material deformation measurement method under temperature and humidity coupling environment according to claim 1, characterized in that: Before collecting the deformation data of the test sample when the test sample is deformed under the preset temperature and humidity coupling environment, the method further includes: Determine the fixing method of the test specimen according to actual needs and fix the test specimen; Wherein, the fixing methods include vertical clamping and horizontal placement.

5. The material deformation measurement method under temperature and humidity coupling environment according to claim 1, characterized in that: The collecting of the sample deformation data when the test sample is deformed in a preset temperature and humidity coupling environment is specifically: Set the initial temperature and humidity in the temperature chamber, and record the current size information of the test specimen through the image acquisition system; Only the temperature in the temperature box is adjusted and the deformation of the test specimen is recorded through the image acquisition system to obtain the temperature deformation data; Only the humidity in the temperature chamber is adjusted and the deformation of the test specimen is recorded through the image acquisition system to obtain humidity deformation data; At the same time, the temperature and humidity in the temperature chamber are adjusted and the deformation of the test specimen is recorded through the image acquisition system to obtain temperature-humidity coupled deformation data; The sample deformation data is obtained according to the current size information, the temperature deformation data, the humidity deformation data and the temperature-humidity coupled deformation data.

6. The material deformation measurement method under temperature and humidity coupling environment according to claim 5, characterized in that: The method only adjusts the temperature in the temperature box and records the deformation of the test sample through the image acquisition system to obtain temperature deformation data, specifically: Starting from the initial temperature, the temperature in the temperature box is cooled or heated at a preset adjustment rate until the temperature reaches a preset first threshold value, and the deformation of the test specimen is recorded by an image acquisition system during the entire cooling or heating process to obtain temperature deformation data at different temperature points; The temperature deformation data will be associated with the corresponding temperature points; and the humidity in the temperature box will be kept constant during the entire process of cooling or heating.

7. The material deformation measurement method under temperature and humidity coupling environment according to claim 5, characterized in that: The method only adjusts the humidity in the temperature chamber and records the deformation of the test sample through the image acquisition system to obtain humidity deformation data, specifically: Starting from the initial humidity, the humidity in the temperature chamber is increased or decreased at a preset adjustment rate until the humidity reaches a preset second threshold value, and the deformation of the test specimen is recorded by an image acquisition system during the entire process of increasing or decreasing the humidity to obtain humidity deformation data at different humidity points; The humidity deformation data will be associated with the corresponding humidity points; and the temperature in the temperature box will be kept constant during the entire process of increasing or decreasing the humidity.

8. The material deformation measurement method under temperature and humidity coupling environment according to claim 5, characterized in that: The temperature and humidity in the temperature box are adjusted simultaneously and the deformation of the test sample is recorded by the image acquisition system to obtain temperature and humidity coupled deformation data, specifically: According to actual needs, the preset humidity range is divided into several humidity points; For each of the humidity points, the humidity in the temperature box is controlled to remain unchanged at one of the humidity points, the temperature in the temperature box is adjusted within a preset temperature range, and the deformation of the test specimen is recorded through an image acquisition system during the entire process of adjusting the temperature until the temperature-humidity coupled deformation data corresponding to all of the humidity points are obtained; wherein, when the entire process of adjusting the temperature is completed at one of the humidity points, the humidity is adjusted to another humidity point.

9. The material deformation measurement method under temperature and humidity coupling environment according to claim 1, characterized in that: The sample deformation data is processed by an image analysis algorithm to obtain a temperature-humidity-deformation relationship curve, specifically: The sample deformation data is processed by an image analysis algorithm to determine the first relationship between temperature and test sample deformation, the second relationship between humidity and test sample deformation, and the third relationship between temperature change and test sample deformation at different humidity levels.

10. A material deformation measurement system in a temperature and humidity coupled environment, characterized in that: include: Measurement preparation module, sample preparation module, deformation data acquisition module and deformation influence curve generation module; Among them, the measurement preparation module is used to set the measurement parameters of the image acquisition system according to the sample information; The sample preparation module is used to prepare a random grayscale distribution image on the sample surface using black spray material and white spray material to obtain a test sample; The deformation data acquisition module is used to acquire deformation data of the test sample when the test sample is deformed in a preset temperature and humidity coupling environment; wherein the preset temperature and humidity coupling environment is a coupling environment at different temperatures and humidities; The deformation influence curve generation module is used to process the sample deformation data through image analysis algorithm to obtain the temperature and humidity-deformation relationship curve to determine the influence of temperature and humidity on material deformation.

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