CN114544340A - Metal material strain fatigue testing device and method based on corrosion environment - Google Patents
Metal material strain fatigue testing device and method based on corrosion environment Download PDFInfo
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- CN114544340A CN114544340A CN202210123544.1A CN202210123544A CN114544340A CN 114544340 A CN114544340 A CN 114544340A CN 202210123544 A CN202210123544 A CN 202210123544A CN 114544340 A CN114544340 A CN 114544340A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
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- G01N2203/0075—Strain-stress relations or elastic constants
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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Abstract
The invention discloses a metal material strain fatigue testing device and method based on a corrosive environment. This metal material fatigue test device that meets an emergency under based on corrosive environment includes load application system, the corrosion container case, fixture and extensometer, load application system is including the last anchor clamps that are located the fixture top and the lower anchor clamps that are located corrosion container case below, the extensometer passes through the cantilever beam and fixes on the stand and for stand free rotation, the extension rod of extensometer is corrosion-resistant ceramic pole, the through-hole has been seted up on the lateral wall of corrosion container case, the inside and outside both sides of through-hole all are pasted and have the rubber piece in order to seal, the gap has been seted up on the rubber piece, the extension rod of extensometer stretches into corrosion container incasement portion and fatigue sample contact through the gap on the rubber piece, the other end and the controller of extensometer are connected. The metal material strain fatigue testing device based on the corrosion environment solves the problems of strain control and liquid leakage in the prior art.
Description
Technical Field
The invention relates to the technical field of mechanical property testing of metal materials, in particular to a device and a method for testing strain fatigue of a metal material based on a corrosion environment.
Background
Since the structural member is used in a corrosive environment for a long time, the structural member is subjected to dynamic impact force in addition to corrosion of liquid during use, and the impact force causes local damage and deformation of the structural member. The deformation fatigue damage of the structural part can be accelerated under the combined action of the external impact force and the corrosive solution. Therefore, the strain-fatigue performance of the materials used for structural members in corrosive environments is critical to the safety assessment of the structural members.
The material strain fatigue test at room temperature mainly has two modes, one mode adopts extensometer control with higher precision, the extensometer contacts the surface of a sample, and the strain in control software is converted into the real deformation of the sample, so that the fatigue sample is subjected to a cycle test under the given strain, and the cycle life of the fatigue sample when cracks or fractures appear is finally obtained; and secondly, a non-contact optical extensometer is adopted, the method adopts a displacement control mode, two marking points are made on the parallel section of the sample, and the change of the distance between the two marking points in the test process is photographed and tracked by a digital computer digital acquisition (DIC) system, so that the dependent variable is calculated. However, there are great difficulties in implementing both of these control methods in an etching solution. The contact extensometer is used for ensuring that an extensometer main body is not corroded and realizing accurate control; by using a non-contact optical method, due to the corrosive liquid, the result obtained by photographing by using the DIC digital acquisition system is distorted, and the significance of the test is completely lost.
Disclosure of Invention
The invention mainly aims to provide a metal material strain fatigue testing device and method based on a corrosion environment, and aims to ensure that a main body of an extensometer cannot contact a corrosion liquid while the extensometer is in contact with the surface of a fatigue sample in the corrosion liquid, so that a control system of the extensometer is prevented from being corroded and damaged.
In order to achieve the purpose, the invention provides a metal material strain fatigue testing device based on a corrosion environment, which comprises a load applying system, a corrosion container box, a clamping mechanism and an extensometer, wherein the clamping mechanism is used for clamping two ends of a fatigue sample, the load applying system comprises an upper clamp positioned above the clamping mechanism and a lower clamp positioned below the corrosion container box, the extensometer is fixed on an upright post through a cantilever beam and can freely rotate relative to the upright post, an extension rod of the extensometer is a corrosion-resistant ceramic rod, a through hole is formed in the side wall of the corrosion container box, rubber sheets are adhered to the inner side and the outer side of the through hole for sealing, a gap is formed in each rubber sheet, the extension rod of the extensometer extends into the corrosion container box through the gap in the rubber sheets to be contacted with the fatigue sample, and the other end of the extensometer is connected with a controller.
Preferably, the clamping mechanism comprises an upper sleeve and a lower sleeve, the upper sleeve and the lower sleeve are respectively sleeved at the upper end and the lower end of the clamping fatigue sample and are in threaded connection with the upper sleeve and the lower sleeve, the lower sleeve is located inside the corrosion container box and is fixedly connected with the corrosion container box, and the upper clamp is connected with the upper sleeve to apply load to the upper sleeve.
Preferably, the corrosion container box comprises a container body with a round hole formed in the bottom and a base which is located at the bottom of the container body and seals the round hole of the container body, the base comprises a supporting chassis with a threaded hole formed in the middle and a lower connecting rod located below the threaded hole of the supporting chassis, the threaded hole is formed in the lower connecting rod and is concentrically arranged with the threaded hole of the supporting chassis, the lower clamp is in threaded connection with the lower connecting rod, and the base is detachably connected with the lower sleeve through the threaded connecting rod.
Preferably, the top of the threaded connecting rod is inserted into the lower sleeve and is in threaded connection with the lower sleeve, and the bottom of the threaded connecting rod is inserted into threaded holes of the support chassis and the lower connecting rod so as to detachably connect the base with the lower sleeve.
Preferably, the connection part of the threaded connecting rod and the threaded hole in the base is locked by a fastening bolt so as to prevent the threaded connecting rod from rotating.
Preferably, the supporting chassis and the container body are connected in a sealing mode through glass cement to prevent liquid leakage.
Preferably, the upper clamp and the lower clamp both comprise a chuck provided with a wedge-shaped opening and a clamp block accommodated in the wedge-shaped opening, and the clamp block is in threaded connection with the upper sleeve or the lower connecting rod.
Preferably, the outer diameter of the upper sleeve is the same as the outer diameter of the lower connecting rod.
Preferably, the outer diameter of the lower sleeve is larger than the diameter of the threaded connecting rod, the diameter of the internal thread at the lower end of the lower sleeve is matched with the outer diameter of the threaded connecting rod, and the size of the internal thread hole at the upper end of the lower sleeve is matched with that of the thread of the upper clamp; the corrosion container box is made of organic glass.
The invention further provides a testing method based on the metal material strain fatigue testing device under the corrosion environment, which comprises the following steps:
external threads are arranged at two ends of a fatigue sample to be tested, after the two ends of the fatigue sample to be tested are held by an upper sleeve and a lower sleeve, the lower sleeve is fixed with a corrosion container box, the upper sleeve is fixed with an upper clamp of a load applying system, a lower clamp of the load applying system is fixed with a base of the corrosion container box, an extension rod of an extensometer penetrates through a gap on a rubber sheet on the side wall of the corrosion container box to be contacted with the fatigue sample, and the other end of the extensometer is connected with a controller;
and adding a corrosion liquid into the corrosion container box, soaking the whole fatigue sample in the corrosion liquid, simultaneously controlling the upper clamp not to be contacted with the corrosion liquid, adding a load to the fatigue sample through the load applying system, performing a cycle test on the fatigue sample under a given strain magnitude, and simultaneously measuring the deformation of the fatigue sample in real time by using an extension rod of the extensometer.
The metal material strain fatigue testing device based on the corrosive environment has the following beneficial effects:
1) the testing device realizes the strain control fatigue test of the extensometer of the sample in the corrosive solution on one hand, and can prevent a liquid corrosion testing machine system on the other hand;
2) the testing device realizes that the extensometer accurately contacts the sample, and can feed the deformation back to the control software to control the test, thereby realizing the strain closed-loop control and improving the testing precision;
3) the corrosion container box is supported by the supporting chassis, so that the stability of the box body is ensured, and the box body is easy to seal;
4) the upper sleeve and the lower sleeve are matched for clamping, so that the fatigue sample can be clamped and centered conveniently;
5) rubber sheets are respectively reinforced outside the through holes in the side walls of the corrosion container box, so that the sealing effect is achieved, and the extensometer extension rod can freely move up and down.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of a metal material strain fatigue testing device based on a corrosive environment according to the present invention;
FIG. 2 is a schematic structural diagram of a corrosion container box in the metal material strain fatigue testing apparatus according to the present invention based on a corrosion environment;
FIG. 3 is a schematic structural diagram of a threaded connecting rod in a metal material strain fatigue testing device based on a corrosive environment according to the present invention;
FIG. 4 is a schematic structural diagram of a lower sleeve of the metal material strain fatigue testing apparatus according to the present invention, based on a corrosive environment;
FIG. 5 is a schematic structural diagram of an upper sleeve of the metal material strain fatigue testing apparatus according to the present invention under a corrosive environment;
FIG. 6 is a schematic structural diagram of a rubber gasket in the metal material strain fatigue testing apparatus according to the present invention under a corrosive environment;
FIG. 7 is a schematic structural diagram of a fatigue test specimen in a metal material strain fatigue testing device based on a corrosive environment.
In the figure, 1-lower clamp block; 2-etching the container box; 3-fastening bolts; 4-extensometer; 5-mounting a clamping block; 6-upper sleeve; 7-fatigue test specimen; 8-lower sleeve; 9-lower connecting rod; 10-an internal threaded hole; 11-a support chassis; 12-rubber skin; 13-a through hole; 14-a gap; 15-threaded connecting rod.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a metal material strain fatigue testing device based on a corrosive environment.
Referring to fig. 1 to 7, in the preferred embodiment, a metal material strain fatigue testing device based on a corrosion environment comprises a load applying system, a corrosion container box 2, a clamping mechanism and an extensometer 4, wherein the clamping mechanism is used for clamping two ends of a fatigue sample 7, the load applying system comprises an upper clamp positioned above the clamping mechanism and a lower clamp positioned below the corrosion container box 2, the extensometer 4 is fixed on an upright post through a cantilever beam and can freely rotate relative to the upright post, an extension rod of the extensometer 4 is a corrosion-resistant ceramic rod, a through hole 13 (in the embodiment, two elliptical holes are formed in the side wall of the corrosion container box 2) is formed in the side wall of the corrosion container box 2, rubber sheets (in the embodiment, rectangular rubber sheets are used, the rubber sheets have good elasticity and meet sealing performance) are adhered to the inner side and the outer side of the through hole 13 for sealing, the rubber sheets are provided with gaps 14 (each rubber sheet is provided with two gaps 14, the length of each gap 14 enables the extension rod of the extensometer 4 to pass through the gap), the extension rod of the extensometer 4 extends into the corrosion container 2 through the gap 14 on the rubber sheet to be contacted with the fatigue sample 7, and the other end of the extensometer 4 is connected with the controller.
Referring to fig. 7, fatigue test piece 7 is a dumbbell-shaped round bar test piece with external threads at both ends. In order to prevent the fatigue test sample 7 from bending in the tension and compression process, the parallel part of the fatigue test sample 7 is as short as possible, the total length is preferably not more than 15mm, and the surface smoothness of the fatigue test sample 7 meets the requirements of the national standard GB/T26076-2010.
Specifically, with reference to fig. 1, 4 and 5, the clamping mechanism includes an upper sleeve 6 and a lower sleeve 8, the upper sleeve 6 and the lower sleeve 8 are respectively sleeved on the upper end and the lower end of the clamping fatigue sample 7 and are in threaded connection with the same, the lower sleeve 8 is located inside the corrosion container box 2 and is fixedly connected with the same, and the upper clamp is connected with the upper sleeve 6 to apply a load to the same.
In this embodiment, referring to fig. 2, corrosion container case 2 includes that the bottom offers the vessel body that has the round hole and is located the vessel body bottom and with the base that its round hole is sealed, this base includes support chassis 11 (for the disc structure) that the middle part offered the screw hole (be internal thread hole 10 promptly), and be located the lower connecting rod 9 that supports chassis 11 screw hole below, the inside offered the screw hole of lower connecting rod 9 is in order to set up with the screw hole that supports chassis 11 is concentric, lower anchor clamps and lower connecting rod 9 threaded connection, the base passes through threaded connection pole 15 and can dismantle with lower sleeve 8 and be connected. The container body can be a cuboid. The size of the round hole on the container body is equal to that of the threaded hole in the base.
In this embodiment, the supporting base plate 11 and the container body are hermetically connected by glass cement to prevent liquid leakage. The supporting chassis 11 and the lower connecting rod 9 can also be connected in a sealing way through glass cement.
Specifically, referring to fig. 1 to 3, the top of the threaded connecting rod 15 is inserted inside the lower sleeve 8 and is threadedly connected thereto, and the bottom of the threaded connecting rod 15 is inserted into the threaded holes of the support chassis 11 and the lower connecting rod 9 to detachably connect the base with the lower sleeve 8.
Referring to fig. 1, further, the connection between the threaded connection rod 15 and the threaded hole in the base is locked by the fastening bolt 3 to prevent the rotation. The axis of the fastening bolt 3 is arranged perpendicular to the axis of the threaded connecting rod 15.
Referring to fig. 1, the upper clamp and the lower clamp both comprise a chuck with a wedge-shaped opening and a clamp block accommodated in the wedge-shaped opening (the clamp block is wedge-shaped, is just matched with the wedge-shaped opening of the chuck, is located above the upper clamp block 5, and is located below the lower clamp block 1), and the clamp block is in threaded connection with the upper sleeve 6 or the lower connecting rod 9 (the upper clamp block 5 is in threaded connection with the upper sleeve 6, and the lower clamp block 1 is in threaded connection with the lower connecting rod 9).
In this embodiment, the wedge-shaped opening is provided, so that the clamp block can be effectively limited to prevent the clamp block from loosening, and the structure is convenient for mounting the clamp block (the clamp block is inserted from two sides of the wedge-shaped opening instead of the bottom surface shown in fig. 1).
Further, the outer diameter of the upper sleeve 6 is the same as that of the lower connecting rod 9, so that centering of the fatigue test piece 7 is guaranteed, and accuracy of load addition to the fatigue test piece 7 is guaranteed.
In the embodiment, the outer diameter of the lower sleeve 8 is larger than the diameter of the threaded connecting rod 15, the diameter of the internal thread at the lower end of the lower sleeve 8 is matched with the outer diameter of the threaded connecting rod 15, and the size of the internal thread hole at the upper end of the lower sleeve 8 is matched with that of the thread of the upper clamp; the corrosion container box 2 is made of organic glass, and a cover plate is not needed above the corrosion container box 2. The internal thread of the upper sleeve 6 has the same dimensions as the upper thread of the fatigue test specimen 7, so that its upper part can be screwed into the upper sleeve 6.
The working principle of the metal material strain fatigue testing device based on the corrosion environment is as follows:
external threads are arranged at two ends of a fatigue sample 7 to be tested, after the two ends of the fatigue sample 7 to be tested are clamped by an upper sleeve 6 and a lower sleeve 8, the lower sleeve 8 is fixed with the corrosion container box 2, the upper sleeve 6 is fixed with an upper clamp of a load applying system, the lower clamp of the load applying system is fixed with a base of the corrosion container box 2, an extension rod of an extensometer 4 penetrates through a gap 14 in a rubber sheet on the side wall of the corrosion container box 2 to be in contact with the fatigue sample 7, and the other end of the extensometer 4 is connected with a controller;
and adding a corrosion solution into the corrosion container box 2, soaking the whole fatigue sample 7 in the corrosion solution, simultaneously controlling the upper clamp not to be in contact with the corrosion solution, increasing a load to the fatigue sample 7 through a load applying system, performing a cyclic test on the fatigue sample 7 under a given strain magnitude, and simultaneously measuring the deformation of the fatigue sample 7 in real time through an extension rod of the extensometer 4.
The metal material strain fatigue testing device based on the corrosion environment provided by the embodiment has the following beneficial effects:
1) the testing device realizes the strain control fatigue test of the extensometer 4 of the sample in the corrosive solution on one hand, and can prevent a liquid corrosion testing machine system on the other hand;
2) the testing device realizes that the extensometer 4 accurately contacts the sample, and can feed back the deformation to the control software to control the test, thereby realizing the strain closed-loop control and improving the testing precision;
3) the corrosion container box 2 is supported by the supporting chassis 11, so that the stability of the box body is ensured, and the box body is easy to seal;
4) the upper sleeve 6 and the lower sleeve 8 are matched for clamping, so that the fatigue sample can be clamped and centered conveniently;
5) rubber 12 is respectively reinforced on the inner surface and the outer surface of a through hole 13 in the side wall of the corrosion container box 2, so that the sealing effect is achieved, and the extending rod of the extensometer 4 can freely move up and down.
The invention further provides a testing method based on the metal material strain fatigue in the corrosion environment.
In this preferred embodiment, a testing method based on the above testing apparatus for metal material strain fatigue under corrosive environment includes the following steps:
external threads are arranged at two ends of a fatigue sample 7 to be tested, after the two ends of the fatigue sample 7 to be tested are clamped by an upper sleeve 6 and a lower sleeve 8, the lower sleeve 8 is fixed with the corrosion container box 2, the upper sleeve 6 is fixed with an upper clamp of a load applying system, the lower clamp of the load applying system is fixed with a base of the corrosion container box 2, an extension rod of an extensometer 4 penetrates through a gap 14 in a rubber sheet on the side wall of the corrosion container box 2 to be in contact with the fatigue sample 7, and the other end of the extensometer 4 is connected with a controller;
and adding a corrosion liquid into the corrosion container box 2, soaking the whole fatigue sample 7 in the corrosion liquid, simultaneously controlling the upper clamp not to be in contact with the corrosion liquid, adding a load to the fatigue sample 7 through a load application system, performing a cyclic test on the fatigue sample 7 under a given strain magnitude, and simultaneously measuring the deformation of the fatigue sample 7 in real time by using an extension rod of the extensometer 4.
The test method provided by the embodiment has the advantages of clear thought, easiness in operation, high accuracy of obtained data, and scientific and reliable performance.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (10)
1. The utility model provides a metal material fatigue test device that meets an emergency based on corrosion environment, a serial communication port, apply system, corrosion container case, fixture and extensometer including the load, wherein, fixture is used for the both ends of centre gripping fatigue sample, the system is applied including the lower anchor clamps that are located the last anchor clamps of fixture top and are located corrosion container case below to the load, but the extensometer passes through the cantilever beam to be fixed on the stand and for stand free rotation, and the extension rod of extensometer is corrosion-resistant ceramic pole, has seted up the through-hole on the lateral wall of corrosion container case, and the inside and outside both sides of through-hole are all pasted and are had the rubber piece in order to seal, have seted up the gap on the rubber piece, and the extension rod of extensometer stretches into corrosion container incasement portion and fatigue sample contact through the gap on the rubber piece, and the other end and the controller of extensometer are connected.
2. The metal material strain fatigue testing device based on the corrosion environment as recited in claim 1, wherein the clamping mechanism comprises an upper sleeve and a lower sleeve, the upper sleeve and the lower sleeve are respectively sleeved on the upper end and the lower end of the clamping fatigue sample and are in threaded connection with the upper sleeve, the lower sleeve is positioned inside the corrosion container box and is fixedly connected with the corrosion container box, and the upper clamp is connected with the upper sleeve to apply load to the upper sleeve.
3. The metal material strain fatigue testing device based on the corrosion environment as recited in claim 2, wherein the corrosion container box comprises a container body with a round hole formed at the bottom, and a base which is located at the bottom of the container body and seals the round hole, the base comprises a supporting chassis with a threaded hole formed in the middle, and a lower connecting rod located below the threaded hole of the supporting chassis, the threaded hole is formed in the lower connecting rod so as to be concentric with the threaded hole of the supporting chassis, the lower clamp is in threaded connection with the lower connecting rod, and the base is detachably connected with the lower sleeve through the threaded connecting rod.
4. The metal material strain fatigue testing device based on the corrosive environment as claimed in claim 3, wherein the top of the threaded connecting rod is inserted into the lower sleeve and is in threaded connection with the lower sleeve, and the bottom of the threaded connecting rod is inserted into the threaded holes of the supporting chassis and the lower connecting rod to detachably connect the base with the lower sleeve.
5. The device for testing the strain fatigue of the metal material under the corrosive environment according to claim 4, wherein the joint of the threaded connecting rod and the threaded hole in the base is locked by a fastening bolt to prevent the threaded connecting rod from rotating.
6. The metal material strain fatigue testing device based on the corrosion environment as recited in claim 3, wherein the supporting chassis is connected with the container body through a glass cement seal to prevent liquid leakage.
7. The metal material strain fatigue testing device based on the corrosive environment of claim 3, wherein the upper clamp and the lower clamp both comprise a chuck provided with a wedge-shaped opening and a clamp block accommodated in the wedge-shaped opening, and the clamp block is in threaded connection with the upper sleeve or the lower connecting rod.
8. The metal material strain fatigue testing device based on the corrosive environment as recited in claim 3, wherein the outer diameter of the upper sleeve is the same as the outer diameter of the lower connecting rod.
9. The metal material strain fatigue testing device based on the corrosive environment as recited in any one of claims 3 to 8, wherein the outer diameter of the lower sleeve is larger than the diameter of the threaded connecting rod, the diameter of the internal thread at the lower end of the lower sleeve is matched with the outer diameter of the threaded connecting rod, and the size of the internal thread hole at the upper end of the lower sleeve is matched with the thread size of the upper clamp; the corrosion container box is made of organic glass.
10. A testing method based on the metal material strain fatigue testing device under the corrosion environment according to any one of claims 3 to 9, characterized by comprising the following steps:
external threads are arranged at two ends of a fatigue sample to be tested, after the two ends of the fatigue sample to be tested are held by an upper sleeve and a lower sleeve, the lower sleeve is fixed with a corrosion container box, the upper sleeve is fixed with an upper clamp of a load applying system, a lower clamp of the load applying system is fixed with a base of the corrosion container box, an extension rod of an extensometer penetrates through a gap on a rubber sheet on the side wall of the corrosion container box to be contacted with the fatigue sample, and the other end of the extensometer is connected with a controller;
and adding a corrosion liquid into the corrosion container box, soaking the whole fatigue sample in the corrosion liquid, simultaneously controlling the upper clamp not to be contacted with the corrosion liquid, adding a load to the fatigue sample through the load applying system, performing a cycle test on the fatigue sample under a given strain magnitude, and simultaneously measuring the deformation of the fatigue sample in real time by using an extension rod of the extensometer.
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| CN202210123544.1A CN114544340A (en) | 2022-02-10 | 2022-02-10 | Metal material strain fatigue testing device and method based on corrosion environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115683824A (en) * | 2022-11-14 | 2023-02-03 | 天津大学 | Fracture toughness testing arrangement of test piece under corrosive environment |
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| CN115683824B (en) * | 2022-11-14 | 2023-09-19 | 天津大学 | Fracture toughness testing device of test piece under corrosive environment |
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