Stress corrosion testing device

Abstract

The invention relates to a stress corrosion testing device which is characterized in that a tensile sample is soaked in a corrosion medium of a glass container, so that a stress corrosion simulation test of the tensile sample under the condition of the corrosion medium is realized; the tensile force value acting on the tensile sample is obtained through the control instrument, when the tensile force value is lower than a set value, the tensile force value is detected by the control instrument, an electric signal is sent to enable the tensile loading unit to act, and the tensile force load acting on the tensile sample tends to be constant through the stretching action of the tensile loading unit and automatic supplementation of the tensile force. Compared with the situation that large errors exist in supplementing time and a supplementing force value due to manual tension supplementing, the tension is automatically supplemented through the tension loading unit, constant tension load is guaranteed, the accuracy of a tension sample stress corrosion test is guaranteed, the accuracy of parameters obtained through the test such as fracture time is improved, and the test efficiency is improved. And more accurate data is provided for researching the stress corrosion process of the tensile sample, so that accurate quantitative guarantee is provided for the service safety of the tensile sample.

Description

Technical Field

[0001] The present application relates to the technical field of stress corrosion, and in particular to a stress corrosion testing device. Background Art

[0002] Aluminum alloys are often used in the fields of ships, warships, submarines and other hulls. Stress corrosion cracking of aluminum alloys often occurs in marine environments. Stress corrosion cracking is a form of metal corrosion damage under the combined action of tensile stress and corrosive media. It will produce intergranular or transgranular cracks inside the metal. This type of corrosion usually occurs in high-speed flowing liquids. Due to irregular flow, cavitation is generated, forming a "water hammer effect", which destroys the protective film on the metal surface and accelerates corrosion. In addition, seawater is rich in salt, the main component of which is sodium chloride. The salt in seawater will react chemically with the metal surface to form oxides and chlorides, which also accelerates the corrosion rate of the metal. Ships and warships made of aluminum alloy materials that have been in service for a long time in the marine environment are often shut down or even scrapped due to stress corrosion cracking.

[0003] Therefore, simulating marine working conditions to conduct stress corrosion test research is of great significance to ensure the safe use of materials. Existing technology usually uses a constant load test to test stress corrosion cracking performance. Specifically, a stress ring is used to fix one end of the tensile sample, and a constant tensile load is applied to the other end. The tensile sample is immersed in the test solution until it is completely broken, and the crack morphology is checked with a metallographic microscope.

[0004] Due to the initial elastic deformation cycle of the sample, the tensile load will decrease with high frequency and short term. The unstable tensile load will lead to errors in the parameters obtained from the stress corrosion test. Summary of the invention

[0005] Based on this, it is necessary to provide a stress corrosion testing device to address the problem of experimental errors in existing stress corrosion testing devices.

[0006] A stress corrosion testing device, comprising:

[0007] A stress ring, one end of the tensile sample is connected to the stress ring;

[0008] A glass container is arranged in the stress ring, wherein the glass container contains a corrosive medium for corroding the tensile sample;

[0009] A stretching loading unit, wherein the stretching sample is inserted into the glass container, and the other end of the stretching sample is connected to the output end of the stretching loading unit, and the stretching loading unit is used to apply tension to the stretching sample;

[0010] A controller is used to obtain the tensile force value applied by the tensile loading unit to the tensile sample. When the tensile force value is lower than a set value, the controller controls the tensile loading unit to perform a telescopic action so that the tensile force value reaches the set value.

[0011] In one embodiment, the tensile loading unit includes an electric hydraulic pump and a hydraulic cylinder connected to the electric hydraulic pump pipeline, and the other end of the tensile loading unit is connected to the output end of the hydraulic cylinder.

[0012] In one of the embodiments, the stress corrosion testing device further comprises a force detection component electrically connected to the controller, wherein the force detection component is disposed at an output end of the hydraulic cylinder, and the force detection component is used to feed back the detected force value to the controller.

[0013] In one embodiment, the stress corrosion testing device further comprises an upper loading plate, the upper loading plate being connected to the output end of the tensile loading unit; the force detection member being fixedly connected to the upper loading plate;

[0014] The stress corrosion testing device further comprises a lower loading plate arranged along the gravity direction with the upper loading plate, and the lower loading plate is connected to the upper loading plate, and the other end of the tensile sample is fixedly connected to the lower loading plate.

[0015] In one of the embodiments, the stress corrosion testing device further comprises an upper fixture for fixing the tensile sample, wherein the upper fixture is fixedly connected to the lower loading plate;

[0016] The stress corrosion testing device further comprises a lower fixture for fixing the tensile sample, wherein the lower fixture is fixedly connected to the stress ring.

[0017] In one embodiment, the stress corrosion testing device further comprises a base, and the stress ring and the lower fixture are both fixedly connected to the base;

[0018] A first sealing ring is arranged between the base and the stress ring; and / or a second sealing ring is arranged between the stress ring and the lower clamp.

[0019] In one of the embodiments, the stress corrosion testing device further comprises an upper sealing cover for sealing the glass container;

[0020] The stress corrosion testing device further comprises a lower sealing cover for sealing the glass container.

[0021] In one embodiment, the upper sealing cover is configured with an injection hole for injecting a corrosive medium; and / or,

[0022] A third sealing ring is provided between at least one of the upper sealing cover and the lower sealing cover and the glass container.

[0023] In one of the embodiments, a heating element for heating the glass container is connected to the outer wall of the glass container;

[0024] The heating element is electrically connected to a temperature detection element.

[0025] In one embodiment, the heating element comprises a silicone heating belt sleeved on the outer wall of the glass container;

[0026] The temperature detection component includes a temperature sensor, and the temperature sensor is electrically connected to the silicone heating belt.

[0027] The above-mentioned stress corrosion testing device can realize a stress corrosion simulation test of the tensile sample under corrosive medium conditions by inserting the tensile sample into a glass container and placing a corrosive medium in the glass container; the tensile force value acting on the tensile sample is obtained by a controller. When the tensile force value is lower than the set value, it will be detected by the controller and an electrical signal will be sent to activate the tensile loading unit. Through the extension and retraction action of the tensile loading unit, the tensile force is automatically supplemented, so that the tensile load acting on the tensile sample tends to be constant. Compared with the situation where there are large errors in the supplementary time and the supplementary force value caused by manual supplementation of the tensile force, the present application automatically supplements the tensile force through the tensile loading unit to ensure the constancy of the tensile load, thereby ensuring the accuracy of the stress corrosion test of the tensile sample, thereby improving the accuracy of the test acquisition parameters such as the fracture time, providing more accurate data for studying the stress corrosion process of the tensile sample, and providing accurate quantitative guarantee for the safety of the tensile sample in service. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a three-dimensional schematic diagram of a stress corrosion testing device provided in one embodiment of the present application.

[0029] FIG. 2 is a front view of the stress corrosion testing device shown in FIG. 1 .

[0030] FIG. 3 is a cross-sectional view of the stress corrosion testing device shown in FIG. 1 at a first cross section.

[0031] FIG. 4 is a partial enlarged view of point A in the stress corrosion testing device shown in FIG. 3 .

[0032] FIG. 5 is a partial cross-sectional view of the stress corrosion testing device shown in FIG. 1 at a second cross section.

[0033] Reference numerals: 110, stress ring; 121, glass container; 122, upper sealing cover; 1221, injection hole; 123, lower sealing cover; 130, tensile loading unit; 131, electric hydraulic pump; 132, hydraulic cylinder; 141, controller; 142, force detection member; 143, display screen; 151, upper loading plate; 152, lower loading plate; 161, upper fixture; 1611, upper mounting groove; 162, lower fixture; 1621, sealing member; 171, heating member; 172. Temperature detection part; 181. Base; 182. First sealing ring; 183. Second sealing ring; 184. Third sealing ring; 185. Fourth sealing ring; 186. First fixing gasket; 187. Second fixing gasket; 191. First fastener; 192. Fastener at the lower end of the sample; 193. Sealing cover fastener; 194. Fastener at the upper end of the sample; 195. Loading fixture; 196. Force detection fastener; 197. Second fastener; 200. Tensile sample. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0040] Stress corrosion cracking is a form of metal corrosion damage under the combined action of tensile stress and corrosive media, which will produce intergranular or transgranular cracks inside the metal. This type of corrosion usually occurs in high-speed flowing liquids. Due to irregular flow, cavitation is generated, forming a "water hammer effect", which destroys the protective film on the metal surface and accelerates corrosion. In addition, seawater is rich in salt, the main component of which is sodium chloride. The salt in seawater will react chemically with the metal surface to form oxides and chlorides, which also accelerates the corrosion rate of the metal. There are many cases where ships and warships made of aluminum alloy materials that have been in service for a long time in the marine environment have been shut down or even scrapped due to stress corrosion cracking. Therefore, it is of great significance to simulate marine conditions to conduct stress corrosion test research to ensure the safe use of materials.

[0041] The prior art usually uses a constant load test to test stress corrosion cracking performance. Specifically, a stress ring is used to fix one end of the tensile sample, and a constant tensile load is applied to the other end, such as loading the tensile sample with bolts, or loading the sample with a spring group, etc. The tensile sample is immersed in a test solution until it is completely broken, and the crack morphology is checked with a metallographic microscope.

[0042] For the method of loading the load with bolts, due to the elastic deformation cycle of the sample in the early stage, the tensile load will be reduced with high frequency and short term, and the bolts will become loose and reduce the tensile stress as the service time increases. The reduction of tensile stress will also reduce the constant load; and for the method of loading the load with disc spring groups, the deformation degree of disc spring groups is different, and the force value applied is also different. If the applied force value needs to be changed, the disc spring group needs to be replaced. The above methods all have the problem of unstable tensile load, which will cause errors in the parameters obtained by stress corrosion test.

[0043] Based on this, an embodiment of the present application provides a stress corrosion testing device that can solve the above-mentioned technical problems. The stress corrosion testing device provided in an embodiment of the present application will be introduced in detail below in conjunction with the accompanying drawings.

[0044] 1 and 3 , a stress corrosion testing device provided in an embodiment of the present application includes a stress ring 110, a glass container 121, a tensile loading unit 130 and a controller 141; one end of a tensile sample 200 is connected to the stress ring 110; the glass container 121 is arranged in the stress ring 110, and the glass container 121 is configured with a corrosion cavity, and the corrosion cavity contains a corrosive medium for corroding the tensile sample 200; the tensile sample 200 is passed through the glass container 121, and the other end of the tensile sample 200 is connected to the output end of the tensile loading unit 130, and the tensile loading unit 130 is used to apply tension to the tensile sample 200; the controller 141 is used to obtain the tension value applied to the tensile sample 200 by the tensile loading unit 130, and when the tension value is lower than a set value, the controller 141 controls the tensile loading unit 130 to perform a telescopic action so that the tension value reaches the set value.

[0045] The above-mentioned stress corrosion testing device can realize a stress corrosion simulation test of the tensile sample 200 under the condition of a corrosive medium by inserting the tensile sample 200 into the glass container 121 and placing a corrosive medium in the glass container 121; the tensile force value acting on the tensile sample 200 is obtained by the controller 141. When the tensile force value is lower than the set value, it will be detected by the controller 141, and an electrical signal will be sent to the tensile loading unit 130 to operate. Through the telescopic action of the tensile loading unit 130, the tensile force is automatically supplemented, so that the tensile load acting on the tensile sample 200 tends to be constant. Compared with the situation where there is a large error in the supplementary time and the supplementary force value caused by manual supplementation of the tensile force, the present application automatically supplements the tensile force through the tensile loading unit 130 to ensure the constancy of the tensile load, thereby ensuring the accuracy of the stress corrosion test of the tensile sample 200, thereby improving the accuracy of the test acquisition parameters such as the fracture time, providing more accurate data for studying the stress corrosion process of the tensile sample 200, and thereby providing accurate quantitative guarantee for the safety of the tensile sample 200 in service.

[0046] Referring to FIGS. 1 to 3 , in one embodiment, the tensile loading unit 130 includes an electric hydraulic pump 131 and a hydraulic cylinder 132 connected to the electric hydraulic pump 131 by a pipeline, and the other end of the tensile loading unit 130 is connected to the output end of the hydraulic cylinder 132, that is, connected to the piston rod of the hydraulic cylinder 132. The hydraulic pump is used to provide hydraulic oil to the hydraulic cylinder 132, and the hydraulic oil enters the hydraulic cylinder 132 to push the piston rod of the hydraulic cylinder 132 to move.

[0047] Among them, the hydraulic cylinder 132 and the electric hydraulic pump 131 are both electrically connected to the controller 141. Through the coordinated work of the controller 141, the electric hydraulic pump 131 and the hydraulic cylinder 132, the controller 141 can control the actions of the electric hydraulic pump 131 and the hydraulic cylinder 132 to realize the automatic replenishment of the tensile load. It has a fast response speed, can realize the precise control of the tensile load, and can reduce the test error caused by the reduction of the tensile load during the test. The effective stroke of the hydraulic cylinder 132 is 100mm, which is much larger than the deformation of the sample. The minimum load applied by the hydraulic cylinder 132 is about 2kg, and the maximum can be 700kg. The models of the hydraulic cylinder 132 and the electric hydraulic pump 131 can be replaced according to the required stroke and tension value.

[0048] Referring to FIGS. 1 to 3 , in one embodiment, the stress corrosion testing device further includes a force detection member 142 electrically connected to the controller 141, the force detection member 142 is disposed at the output end of the hydraulic cylinder 132, and the force detection member 142 is used to feed back the detected force value to the controller 141. The force detection member 142 can specifically be a force sensor, which can detect the tension value. Furthermore, the stress corrosion testing device further includes a display screen 143 electrically connected to the controller 141, and the display screen 143 is used to display the tension value detected by the force sensor.

[0049] Referring to FIGS. 1 to 3 , in one embodiment, the stress corrosion testing device further includes an upper loading plate 151, which is connected to the output end of the tensile loading unit 130; and the force detection member 142 is fixedly connected to the upper loading plate 151. Specifically, the tensile loading unit 130 includes a hydraulic cylinder 132, the upper loading plate 151 is connected to the output end of the hydraulic cylinder 132, and the force detection member 142 is a force sensor. The force sensor and the upper loading plate 151 can be fixedly connected by a force detection fastener 196, and are installed on the top of the stress ring 110 together with the hydraulic cylinder 132. The force detection fastener 196 can be a bolt.

[0050] Referring to FIGS. 1 to 3 , the stress corrosion test device further includes a lower loading plate 152 arranged along the gravity direction with the upper loading plate 151, and the lower loading plate 152 is connected to the upper loading plate 151, and the other end of the tensile sample 200 is fixedly connected to the lower loading plate 152. When the tensile loading unit 130 extends upward, that is, when the tension is supplemented, the upper loading plate 151 and the lower loading plate 152 are both moved upward, and the tensile load supplemented by the tensile loading unit 130 is transmitted to the tensile sample 200 through the cooperation of the upper loading plate 151 and the lower loading plate 152. Among them, the upper loading plate 151 and the lower loading plate 152 are fixedly connected by a loading fixture 195, and the loading fixture 195 can be specifically a bolt, the rod of the bolt passes through the upper loading plate 151 and the lower loading plate 152 in sequence, and the bolt rod and the lower loading plate 152 are locked by a nut.

[0051] Referring to Figures 3 to 5, in one embodiment, the stress corrosion testing device also includes an upper clamp 161 for fixing the upper end of the tensile sample 200 and a lower clamp 162 for fixing the lower end of the tensile sample 200, the upper clamp 161 is fixedly connected to the lower loading plate 152, and the lower clamp 162 is fixedly connected to the stress ring 110.

[0052] Among them, both the upper clamp 161 and the lower clamp 162 are provided with a fixing groove for the tensile sample 200 to pass through. After the upper end of the tensile sample 200 is passed through the fixing groove of the lower clamp 162, it is fixed to the upper clamp 161 through the sample upper end fastener 194; after the lower end of the tensile sample 200 is passed through the fixing groove of the lower clamp 162, it is fixed to the lower clamp 162 through the sample lower end fastener 192. The upper clamp 161 and the lower loading plate 152 can be fixedly connected by a second fastener 197. A second fixing gasket 187 is also provided between the second fastener 197 and the lower loading plate 152. The second fixing gasket 187 can fill the unevenness and gap between the connection surfaces, ensure the sealing of the connection between the second fastener 197 and the lower loading plate 152, and also has multiple functions such as corrosion protection, shock absorption and sound insulation. The sample upper end fastener 194, the sample lower end fastener 192 and the second fastener 197 can be bolts.

[0053] Referring to FIGS. 2 to 4 , in one embodiment, the stress corrosion testing device further includes a base 181, and the stress ring 110 and the lower fixture 162 are both fixedly connected to the base 181. Specifically, the stress ring 110 and the lower fixture 162 can be fixed to the base 181 by a first fastener 191, and the first fastener 191 is sequentially arranged on the base 181, the stress ring 110 and the lower fixture 162 to achieve the connection of the three. Further, a first fixed gasket 186 is also arranged between the first fastener 191 and the base 181 to ensure the sealing of the connection between the first fastener 191 and the base 181, and also has multiple functions such as corrosion protection, shock absorption and sound insulation. Further, a fourth sealing ring 185 is arranged at the connection between the base 181 and the first fixed gasket 186 to improve the connection sealing effect between the two, wherein the lower end surface of the base 181 is provided with a receiving groove for accommodating the fourth sealing ring 185 to improve the connection sealing effect between the two. The first fastener 191 may specifically be a bolt.

[0054] Referring to FIG. 4 , in one embodiment, a first sealing ring 182 is provided between the base 181 and the stress ring 110. Specifically, a receiving groove is provided on the upper end surface of the base 181 for receiving the first sealing ring 182. The first sealing ring 182 can fill the unevenness and gap between the connection surfaces of the base 181 and the stress ring 110, thereby ensuring the sealing of the connection, and can also play a variety of roles such as shock absorption and sound insulation. Furthermore, a second sealing ring 183 is provided between the connection of the stress ring 110 and the lower clamp 162 to enhance the connection sealing effect between the two.

[0055] Referring to FIG. 4 , in one embodiment, the stress corrosion testing device further includes an upper sealing cover 122 and a lower sealing cover 123 for sealing the glass container 121. The upper sealing cover 122 and the lower sealing cover 123 can be fixedly connected by a sealing cover fastener 193, and the sealing cover fastener 193 can be a bolt. Further, a third sealing ring 184 is provided between at least one of the upper sealing cover 122 and the lower sealing cover 123 and the glass container 121. For example, in this embodiment, a third sealing ring 184 is provided between the upper sealing cover 122 and the lower sealing cover 123 and the glass container 121 to improve the sealing effect.

[0056] As shown in FIG4 , the upper sealing cover 122 may be provided with an upper mounting groove 1611, and the upper clamp 161 is clamped in the upper mounting groove 1611. The lower sealing cover 123 is provided with a lower mounting groove, and the lower clamp 162 is clamped in the lower mounting groove. This arrangement can improve the connection effect between the components. Furthermore, a sealing member 1621 may be provided between the lower clamp 162 and the lower sealing cover 123 to improve the connection and sealing effect between the two.

[0057] Referring to FIG. 1 , in one embodiment, the upper sealing cover 122 is configured with an injection hole 1221 for injecting a corrosive medium, and the corrosive medium is conveniently replenished through the injection hole 1221. The corrosive medium may specifically be a sodium chloride solution with a concentration of 3.5% to simulate an actual seawater environment. Of course, other liquids with other concentrations may also be set according to actual simulated working conditions.

[0058] The stress corrosion test device in the prior art does not have the ability to simulate stress corrosion in a high temperature environment, and has low adaptability. Based on this, referring to FIG. 2 and FIG. 4 , in one embodiment, the outer wall of the glass container 121 is connected to a heating element 171 for heating the glass container 121, and the corrosive medium is heated by the heating element 171, so that stress corrosion testing in a high temperature environment can be achieved. Among them, the heating element 171 can heat the range of 0°C-180°C, which is sufficient to simulate the high temperature environment of the ocean.

[0059] Specifically, the heating element 171 includes a silicone heating belt sleeved on the outer wall of the glass container 121; the silicone heating belt can be completely wrapped around the outer surface of the glass container 121 to increase the heating area, so that the temperature distribution of the glass container 121 is more uniform, which is more conducive to improving the accuracy of the test. The axial length of the silicone heating belt can be adapted to the axial length of the glass container 121, that is, it completely wraps the glass container 121. Of course, the axial length of the silicone heating belt can also be less than the axial length of the glass container 121, so that the temperature distribution of each area is balanced through heat radiation, and it can be set according to actual needs.

[0060] Further, referring to FIG. 2 and FIG. 4 , the heating element 171 is electrically connected to a temperature detection element 172, and the temperature of the corrosive medium can be detected by the temperature detection element 172. When the temperature is less than a preset value, the heating element 171 is started again, so that the temperature of the corrosive medium remains constant, thereby improving the accuracy of the test. Specifically, the temperature detection element 172 can be a temperature sensor, and the temperature sensor is electrically connected to the silicone heating belt. After the silicone heating belt is powered on, it can be heated to a set value and keep the temperature stable.

[0061] In an actual application scenario, the tensile sample 200 may be a flat rectangular sample with a thickness of 5 mm to 6 mm and a width of 14 mm to 16 mm. Of course, the shape of the tensile sample is not limited thereto, and other shapes may be selected according to test requirements.

[0062] The following is an explanation of the working process of the stress corrosion testing device:

[0063] Firstly, the experimental corrosion medium is designed and configured according to the field working conditions to be simulated. The tensile parameters can be calculated according to the product of the yield strength and the tensile cross-sectional area of ​​the sample, thereby obtaining the tensile load to be applied to the tensile sample 200.

[0064] Next, remove the sample upper end fastener 194 of the upper fixture 161 and the sample lower end fastener 192 of the lower fixture 162, pull up the upper fixture 161, and insert the tensile sample 200 through the upper sealing cover 122 and into the fixing groove of the lower fixture 162. Then lower the upper fixture 161 so that the upper end of the tensile sample 200 is inserted into the fixing groove of the upper fixture 161, and then fix the two ends of the tensile sample 200 to the upper fixture 161 and the lower fixture 162 respectively by the sample upper end fastener 194 and the sample lower end fastener 192.

[0065] Next, the control device 141 and the electric hydraulic pump 131 are powered on, and the previously calculated tension parameters are set on the control device 141 .

[0066] Then, the syringe injects the corrosive medium into the corrosion cavity of the glass container 121 through the injection hole 1221 of the upper sealing cover 122. The silicone heating belt and the temperature sensor are powered on, and the silicone heating belt heats the glass container 121 to the temperature of the desired simulated field conditions. The hydraulic pump is started to start the stress corrosion test until the tensile sample 200 breaks. During the test, the corrosive medium needs to be properly supplemented.

[0067] After the tensile sample 200 breaks, the test can be ended, the silicone heating belt can be turned off, and the tensile sample 200 can be removed. The fracture morphology of the tensile sample 200 and the corrosion morphology and corrosion product analysis on the surface of the tensile sample 200 are observed using a scanning electron microscope. Data such as the time required for fracture and the tensile force can be read out through the display screen 143.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A stress corrosion testing device, characterized in that: The stress corrosion testing device comprises: A stress ring (110), one end of the tensile sample (200) being connected to the stress ring (110); A glass container (121) is disposed in the stress ring (110), wherein the glass container (121) contains a corrosive medium for corroding the tensile sample (200); A tensile loading unit (130), wherein the tensile sample (200) is inserted into the glass container (121), and the other end of the tensile sample (200) is connected to the output end of the tensile loading unit (130), and the tensile loading unit (130) is used to apply a tensile force to the tensile sample (200); A control device (141), the control device (141) is used to obtain the tension value applied by the tensile loading unit (130) to the tensile sample (200), and when the tension value is lower than a set value, the control device (141) controls the tensile loading unit (130) to perform a telescopic action so that the tension value reaches the set value.

2. The stress corrosion testing device according to claim 1, characterized in that: The tensile loading unit (130) comprises an electric hydraulic pump (131) and a hydraulic cylinder (132) connected to the electric hydraulic pump (131) through a pipeline, and the other end of the tensile loading unit (130) is connected to an output end of the hydraulic cylinder (132).

3. The stress corrosion testing device according to claim 2, characterized in that: The stress corrosion testing device further comprises a force detection component (142) electrically connected to the controller (141); the force detection component (142) is arranged at an output end of the hydraulic cylinder (132); the force detection component (142) is used to feed back a detected force value to the controller (141).

4. The stress corrosion testing device according to claim 3, characterized in that: The stress corrosion testing device further comprises an upper loading plate (151), wherein the upper loading plate (151) is connected to the output end of the tensile loading unit (130); the force detection member (142) is fixedly connected to the upper loading plate (151); The stress corrosion testing device further comprises a lower loading plate (152) arranged along the gravity direction with the upper loading plate (151), and the lower loading plate (152) is connected to the upper loading plate (151), and the other end of the tensile sample (200) is fixedly connected to the lower loading plate (152).

5. The stress corrosion testing device according to claim 4, characterized in that: The stress corrosion testing device further comprises an upper clamp (161) for fixing the tensile sample (200), wherein the upper clamp (161) is fixedly connected to the lower loading plate (152); The stress corrosion testing device further comprises a lower clamp (162) for fixing the tensile sample (200), wherein the lower clamp (162) is fixedly connected to the stress ring (110).

6. The stress corrosion testing device according to claim 5, characterized in that: The stress corrosion testing device also includes a base (181), and the stress ring (110) and the lower clamp (162) are both fixedly connected to the base (181); A first sealing ring (182) is provided between the base (181) and the stress ring (110); and / or a second sealing ring (183) is provided between the stress ring (110) and the lower clamp (162).

7. The stress corrosion testing device according to claim 1, characterized in that: The stress corrosion testing device further comprises an upper sealing cover (122) for sealing the glass container (121); The stress corrosion testing device also includes a lower sealing cover (123) for sealing the glass container (121).

8. The stress corrosion testing device according to claim 7, characterized in that: The upper sealing cover (122) is configured with an injection hole (1221) for injecting a corrosive medium; and / or, A third sealing ring (184) is provided between at least one of the upper sealing cover (122) and the lower sealing cover (123) and the glass container (121).

9. The stress corrosion testing device according to claim 1, characterized in that: The outer wall of the glass container (121) is connected to a heating element (171) for heating the glass container (121); The heating element (171) is electrically connected to a temperature detection element (172).

10. The stress corrosion testing device according to claim 9, characterized in that: The heating element (171) comprises a silica gel heating belt sleeved on the outer wall of the glass container (121); The temperature detection component (172) comprises a temperature sensor, and the temperature sensor is electrically connected to the silica gel heating belt.

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