CN216051110U - Constant load stress testing device for bar and rod test sample applied to corrosive environment - Google Patents
Constant load stress testing device for bar and rod test sample applied to corrosive environment Download PDFInfo
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- CN216051110U CN216051110U CN202121721046.4U CN202121721046U CN216051110U CN 216051110 U CN216051110 U CN 216051110U CN 202121721046 U CN202121721046 U CN 202121721046U CN 216051110 U CN216051110 U CN 216051110U
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Abstract
The utility model discloses a constant load stress testing device for a bar and rod test sample applied to a corrosive environment, which comprises a rectangular frame (1) and a plurality of loading screws (2); one end of the loading screw rod (2) is provided with a plurality of openings at equal intervals, the other end of the loading screw rod is connected with the top end of the rectangular frame (1), the loading screw rod (2) is connected with the test sample (5), and the test sample (5) penetrates through the bottom end of the rectangular frame (1). The test method comprises the following steps: determining a corrosive environment medium and a loading load of a test sample; connecting a test sample with a test device, and loading a load on the test sample; placing the testing device in a corrosive environment medium for 1-6 months; and after the test is finished, taking down the test sample, observing whether the test sample is broken, and carrying out crack detection, surface corrosion morphology detection, corrosion product analysis and mechanical property test on the test sample. The utility model has simple structure, safety and reliability, is convenient for carrying out actual working condition tests and can conveniently carry out a plurality of groups of tests.
Description
Technical Field
The utility model belongs to the technical field of constant load stress corrosion tests of metal materials, and particularly relates to a constant load stress testing device for a wire and bar test sample applied to a corrosion environment.
Background
The corrosion problem is one of the important threats faced by metal materials in the ocean development process, and a great number of cases of catastrophic accidents caused by ocean corrosion cause great loss. According to statistics, only 30% of steel materials are corroded every year around the world, the corrosion economic loss reaches hundreds of billions, the loss of marine corrosion accounts for 1/3 of the total corrosion loss, and the economic loss caused by corrosion is larger than the sum of the losses caused by natural disasters such as fire, flood, wind, earthquake and the like every year. Therefore, it is necessary to test the corrosion resistance of the material before the actual application of the marine engineering, and to evaluate the practicability of the material of the member. The authenticity and the instructive performance of the corrosion resistance data of the ocean engineering material are ensured, the premise of material selection for marine engineering construction is provided, and the rationality and the scientificity of the stress corrosion evaluation of the real sea environment are benefited. The constant load stress corrosion test in the current standard GBT 2454-2009 is a common stress corrosion method, and a test sample needs to be processed into a specific shape and then placed in a test device to complete the stress corrosion resistance evaluation. In order to rapidly analyze the test result, the test under the simulated corrosion environment is often performed on the sample, but the method cannot completely reproduce the complex marine corrosion environment. Meanwhile, a wire rod with the diameter of 2mm-8mm or a thin rod is difficult to process into a specified sample, and the mechanical property of the sample is easy to damage in the processing process, so that the evaluation of a stress corrosion test is difficult to complete.
Patent CN103926146A utilizes stress ring loading mode to provide one kind and can test the constant load stress corrosion unit of thin wall pipe, the anti stress corrosion cracking characteristic of small-size component, and this utility model device need carry out the round hole processing in order to fix the sample through the pin to the sample. The patent CN104749029A can be applied to the actual or laboratory simulated marine environment by the testing device which is spring-loaded and is loaded by Hooke's law to carry out stress corrosion, but the device is complex and only can be used for sheet-shaped samples. Although the device that current patent relates to can make things convenient for the high efficiency to the sample carry out the constant load stress corrosion test, but only be limited to slice sample or the great bar-shaped sample of diameter and need process the sample, can't carry out fine anti stress corrosion capability test to the line rod sample. Because no stress corrosion test method aiming at 2mm-8mm wire rods exists, the material selection is difficult and the risk of stress corrosion is faced.
At present, the conventional constant load stress corrosion test method has the following defects: (1) the sample needs to be processed, and is not suitable for a wire or thin rod sample; (2) the test device needs to be additionally provided with a stress detection device, and the detection device cannot contact with a corrosion environment, so that the device is not suitable for an actual corrosion environment; (3) most of the testing devices are lever type loading devices and spring or stress ring loading devices, and the lever type loading mode testing devices are large in size and only suitable for atmospheric environments; although the device adopting the spring or stress ring loading mode has a reduced volume, a sample needs to be processed, and a load loading error is larger for a non-standard sample.
SUMMERY OF THE UTILITY MODEL
The utility model provides a constant load stress testing device applied to a wire and a thin bar in a corrosion environment, which is simple in structure, easy to operate, safe and reliable, convenient for actual working condition tests and capable of conveniently performing multiple groups of tests and aims to solve the problems that a wire or thin bar sample stress corrosion test cannot be performed in a constant load stress corrosion test in the prior art and a testing device is difficult to perform tests in a marine or marine atmospheric corrosion environment.
The utility model adopts the following technical scheme:
the constant-load stress testing device for the wire and rod test sample applied to the corrosive environment is characterized by comprising a rectangular frame (1), a plurality of loading screws (2), a plurality of groups of first fastening U-shaped chucks (4) and a plurality of groups of second fastening U-shaped chucks (7), wherein a plurality of openings are formed in one ends of the loading screws (2) at equal intervals, the other ends of the loading screws (2) are connected with the top end of the rectangular frame (1), one ends of the loading screws (2) at which a plurality of openings are formed at equal intervals are connected with one end of a test sample (5) through the group of first fastening U-shaped chucks (4), the other ends of the test sample (5) penetrate through the bottom end of the rectangular frame (1), and the test sample (5) and the bottom end of the rectangular frame (1) are fixed through the group of second fastening U-shaped chucks (7).
The bar and bar test sample constant load stress testing device applied to the corrosive environment is characterized in that a plurality of through holes with the same number as that of the loading screws (2) are processed at the top end of the rectangular frame (1), a plurality of through holes with the same number as that of the loading screws (2) are processed at the bottom end of the rectangular frame (1), threads are processed at one end, away from the end where a plurality of openings are processed, of the loading screws (2), one end, processed with the threads, of the loading screws (2) penetrates through the through holes processed at the top end of the rectangular frame (1), and one end, processed with the threads, of the loading screws (2) is fixed with the top end of the rectangular frame (1) through a loading nut (3); one end, far away from the loading screw rod (2), of the test sample (5) penetrates through a through hole machined in the bottom end of the rectangular frame (1).
The bar and bar material sample constant load stress testing device applied to the corrosion environment is characterized in that an insulating gasket (6) is arranged between one end, provided with threads, of the loading screw rod (2) and the loading nut (3); an insulating gasket (6) is arranged between the test sample (5) and the first fastening U-shaped chuck (4); an insulating gasket (6) is arranged between the bottom end of the rectangular frame (1) and the second fastening U-shaped chuck (7); an insulating gasket (6) is arranged between the second fastening U-shaped clamping head (7) and the test sample (5).
The constant-load stress testing device for the bar and rod test sample applied to the corrosive environment is characterized in that the rectangular frame (1) is made of 316 stainless steel; the width of the rectangular frame (1) is 120-200 mm, the length of the rectangular frame (1) is 200-250 mm, and the beam width of the rectangular frame (1) is 10-30 mm; the diameter of the through hole processed at the top end of the rectangular frame (1) is 4-12 mm, the diameter of the through hole processed at the bottom end of the rectangular frame (1) is 4-12 mm, and the diameter of the through hole processed at the top end of the rectangular frame (1) is the same as that of the through hole processed at the bottom end of the rectangular frame (1).
The bar and bar material sample constant load stress testing device applied to the corrosive environment is characterized in that the material of the loading screw rod (2) is 316 stainless steel, the specification of the loading screw rod (2) is M4-M10, and the length of the loading screw rod is 80mm-120 mm; an anti-rotation fastening platform is processed in the middle of the loading screw rod (2); the loading nut (3) is an anti-loosening flange nut matched with the loading screw rod (2), and the loading nut (3) is made of 316 stainless steel.
The constant load stress testing device for the bar and rod test sample applied to the corrosive environment is characterized in that the insulating gasket (6) is made of polytetrafluoroethylene or silicon rubber.
The constant load stress testing device for the wire and rod test sample applied to the corrosive environment is characterized in that the test sample (5) is a wire or rod test sample, and the diameter of the test sample (5) is 2mm-8 mm.
The utility model has the beneficial technical effects that: compared with the prior art, the test device can test the constant load stress corrosion resistance of a wire or thin rod metal sample in an actual working condition service environment or a laboratory simulation environment, the sample does not need to be processed, the tensile stress level loaded on the test sample is accurately controlled by using the loading screw and the loading nut, and the stress corrosion performance and the corrosion mechanism of the wire or thin rod sample of 2-8mm can be evaluated and researched in an ocean or ocean atmosphere service environment or the laboratory simulation environment. The device and the test method can be used for testing the stress corrosion resistance of the wire and thin rod test samples which cannot be processed into the standard test samples. The utility model has the characteristics of simple structure, easy operation, safety, reliability, convenient actual working condition test and convenient multi-group test. The device is applied to the aspects of the constant load stress corrosion test of the bar and rod test sample exposed for a long time in the marine environment, the marine atmospheric environment and other corrosion environments or the laboratory simulated marine environment. The utility model utilizes the combination of the fastening stud and the fastening nut, is suitable for wire and thinner bar samples, and the samples do not need to be processed; the test sample is loaded by a commercially available torque wrench, so that the test operation is simple; the device is suitable for the actual service working condition environment of the material, and can truly reflect the stress corrosion condition of the sample under the service working condition; the rectangular frame can realize that a plurality of groups of stress corrosion tests are carried out in one frame by increasing the through holes, thereby saving tools and materials.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic perspective view of the apparatus of the present invention;
FIG. 3 is a schematic structural view of a loading screw according to the present invention;
FIG. 4 is a schematic view of a multi-sample testing apparatus according to the present invention.
Detailed Description
Referring to fig. 1-4, the constant load stress testing device for the bar and bar material test sample applied to the corrosive environment comprises a rectangular frame 1, a plurality of loading screws 2, a plurality of groups of first fastening U-shaped clamps 4 and a plurality of groups of second fastening U-shaped clamps 7; a plurality of openings are processed at equal intervals at one end of each loading screw rod 2, the other end of each loading screw rod 2 is connected with the top end of the rectangular frame 1, and the end of each loading screw rod 2, at which a plurality of openings are processed at equal intervals, is a sample holding part. One end of each loading screw rod 2, which is provided with a plurality of openings at equal intervals, is connected with one end of one test sample 5 through a group of first fastening U-shaped clamping heads 4, the other end of the test sample 5 penetrates through the bottom end of the rectangular frame 1, the test sample 5 and the bottom end of the rectangular frame 1 are fixed through a group of second fastening U-shaped clamping heads 7, and the second fastening U-shaped clamping heads 7 are located at the bottom of the rectangular frame 1. The loading screw rod is matched with the loading nut and then penetrates through the through hole at the top end of the frame to be connected with the upper part of the test sample, and the upper part of the test sample extends into the opening of the loading screw rod for 20mm and is fastened through the first fastening U-shaped clamp. The top end of the rectangular frame 1 is provided with through holes, the bottom end of the rectangular frame 1 is provided with through holes, the number of the through holes processed at the top end of the rectangular frame 1, the number of the through holes processed at the bottom end of the rectangular frame 1 and the number of the loading screws 2 are the same, one end, away from the end provided with a plurality of openings, of each loading screw 2 is provided with threads, one end, provided with threads, of each loading screw 2 penetrates through one through hole processed at the top end of the rectangular frame 1, one end, provided with threads, of each loading screw 2 is fixed with the top end of the rectangular frame 1 through a loading nut 3, the loading nut 3 is installed at the top of the rectangular frame 1, and one end, provided with threads, of each loading screw 2 is connected with the loading nut 3; the end of the test specimen 5 far from the loading screw 2 passes through a through hole machined in the bottom end of the rectangular frame 1.
An insulating gasket 6 is arranged between one end of the loading screw rod 2 with threads and the loading nut 3; an insulating gasket 6 is arranged between the test sample 5 and the first fastening U-shaped clamp 4; an insulating gasket 6 is arranged between the bottom end of the rectangular frame 1 and the second fastening U-shaped clamp 7; an insulating gasket 6 is arranged between the second fastening U-shaped clamp 7 and the test sample 5; insulating gasket 6 is used for preventing the metalwork from taking place galvanic corrosion, and insulating gasket 6's material is non-metallic material, and preferred, insulating gasket 6's material is polytetrafluoroethylene or silicon rubber. The rectangular frame 1 is made of corrosion-resistant 316 stainless steel or a corrosion-resistant material corresponding to the actual environment; the width of the rectangular frame 1 is 120mm-200mm, the length of the rectangular frame 1 is 200mm-250mm, and the beam width of the rectangular frame 1 is 10mm-30 mm; the diameter of the through hole processed at the top end of the rectangular frame 1 is 4mm-12mm, the diameter of the through hole processed at the bottom end of the rectangular frame 1 is 4mm-12mm, and the diameter of the through hole processed at the top end of the rectangular frame 1 is the same as that of the through hole processed at the bottom end of the rectangular frame 1. The material of the loading screw rod 2 is 316 stainless steel or a corrosion-resistant material corresponding to the actual environment, the specification of the loading screw rod 2 is M4-M10, and the length of the loading screw rod 2 is 80mm-120 mm; an anti-rotation fastening platform is processed in the middle of the loading screw 2; the loading nut 3 is a looseness-preventing flange nut matched with the loading screw rod 2, looseness of the loading nut in an experimental process is prevented, and the loading nut 3 is made of 316 stainless steel or a corrosion-resistant material corresponding to an actual environment. The test sample 5 is a wire or bar sample, the diameter of the test sample 5 is 2mm-8mm, and the test sample does not need to be processed. And the loading screw rod 2 is matched with the loading nut 3 and then passes through a through hole at the top end of the rectangular frame 1 to be connected with the upper part of the test sample 5. The upper part of the test specimen 5 protrudes into the opening of the loading screw 2 and is fastened by means of a first fastening clevis 4. The lower end of the test specimen 5 passes through the bottom end through hole of the rectangular frame 1 and is fixed by a second fastening U-shaped clamp 7. A plurality of pairs of through holes are formed in the rectangular frame simultaneously, and a plurality of test samples are fastened to realize simultaneous experiments of the same load or different loads of the plurality of test samples.
The testing method of the constant load stress testing device of the bar material sample applied to the corrosion environment comprises the following steps:
step (I): determining a corrosive environment medium and a loading load of the test sample 5 according to the actual working condition of the test sample to be tested; the formula for determining the loading load of the test specimen 5 is: t ═ k · F · d, where T is the torque measured by the torque wrench in Nm; k is a torque coefficient and is related to a nut material; d is the nominal diameter of the thread of the loading screw 2, and the unit is m; and F is axial pre-tightening force, namely the loading load of the test sample 5, and the unit is N.
Step (II): the test specimen 5 is connected to the test apparatus, and a load is applied to the test specimen 5. After the test sample 5 is fastened, the loading nut is rotated through the high-precision torque wrench to load a load, and a wrench is required to be replaced during loading to clamp the loading screw platform to prevent the test sample from rotating.
Step (three): and (3) placing the testing device in a corrosive environment medium, and recording the starting time of the test, wherein the testing time is 1-6 months.
Step (IV): and after the test is finished, taking down the test sample 5, observing whether the test sample 5 is broken, and carrying out crack detection, surface corrosion morphology detection, corrosion product analysis and mechanical property test on the test sample 5.
Example 1
In order to test the stress corrosion performance of a copper alloy metal wire rod having a diameter of 6mm and a length of 250mm, a through hole having a diameter of 9mm was formed in a rectangular frame having a size of 160mm × 240 mm. The diameter of the loading screw is 8mm (M8), the length of the loading screw is 80mm, the material is 316 stainless steel, the internal opening design of the test sample clamping part is carried out, and the anti-rotation fastening platform is processed at the middle part; the loading nut is an anti-loosening flange nut matched with the M8 loading screw and is made of 316 stainless steel. The insulating gasket is made of polytetrafluoroethylene material or silicon rubber material, so that contact corrosion between metal parts is prevented. And the loading screw rod penetrates through a through hole at the upper end of the frame through a loading nut and is connected with the upper part of a copper alloy wire sample with the diameter of 6 mm. The upper portion of the coupon extended into the loading screw opening and was secured by a 316-securing U-clamp of commercially available M8. And insulating gaskets are arranged between the loading screw rod and the loading nut, between the loading screw rod and the test sample, and between the fastening chuck and the loading screw rod. The lower end of a 6mm copper alloy wire sample is fixed by a fastening U-shaped clamp of M6 through a through hole at the bottom of the rectangular frame. And insulating gaskets are arranged between the fastening U-shaped chuck and the test sample and between the fastening U-shaped chuck and the rectangular frame.
After a test sample is fastened, a commercially available high-precision torque wrench is used for rotating the loading nut to load a load, and a wrench is additionally selected to clamp the loading screw platform to prevent the sample from rotating. The loading load is determined according to the formula T ═ k · F · d. Wherein T is the torque measured by the torque wrench in Nm; k is a torque coefficient and is related to a nut material; d is the nominal diameter of the thread in m; f is axial pretightening force, namely the loading load of the test sample in unit N. The loading loads in the test respectively correspond to the loads under 40% yield strength, 60% yield strength and 80% yield strength of the wire rod, and are 4520N, 6790N and 9050N respectively. 4 parallel specimens were set up under each load.
And placing the testing device in seawater of a service environment of a wire rod sample, recording the placing position and time, respectively placing for 1 month, 2 months, 4 months and 6 months, then respectively taking out a group of samples to perform surface corrosion morphology, corrosion product film and crack detection and analysis, and testing and analyzing the residual strength of a broken sample.
Claims (7)
1. A constant load stress testing device of a bar material sample applied to a corrosive environment is characterized in that, the device comprises a rectangular frame (1), a plurality of loading screws (2), a plurality of groups of first fastening U-shaped chucks (4) and a plurality of groups of second fastening U-shaped chucks (7), a plurality of openings are processed at one end of the loading screw rod (2) at equal intervals, the other end of the loading screw rod (2) is connected with the top end of the rectangular frame (1), one end of the loading screw rod (2) which is provided with a plurality of openings at equal intervals is connected with one end of the test sample (5) through a group of first fastening U-shaped chucks (4), the other end of the test sample (5) penetrates through the bottom end of the rectangular frame (1), the test sample (5) and the bottom end of the rectangular frame (1) are fixed through a group of second fastening U-shaped chucks (7).
2. The bar material sample constant load stress testing device applied to the corrosive environment according to the claim 1, characterized in that the top end of the rectangular frame (1) is processed with a plurality of through holes with the same number as the loading screws (2), the bottom end of the rectangular frame (1) is processed with a plurality of through holes with the same number as the loading screws (2), the end of the loading screw (2) far away from the end processed with a plurality of openings is processed with screw threads, the end of the loading screw (2) processed with screw threads passes through the through holes processed at the top end of the rectangular frame (1), and the end of the loading screw (2) processed with screw threads is fixed with the top end of the rectangular frame (1) through a loading nut (3); one end, far away from the loading screw rod (2), of the test sample (5) penetrates through a through hole machined in the bottom end of the rectangular frame (1).
3. The bar material sample constant load stress testing device applied to the corrosive environment according to claim 2, wherein an insulating gasket (6) is arranged between one end of the loading screw rod (2) which is provided with threads and the loading nut (3); an insulating gasket (6) is arranged between the test sample (5) and the first fastening U-shaped chuck (4); an insulating gasket (6) is arranged between the bottom end of the rectangular frame (1) and the second fastening U-shaped chuck (7); an insulating gasket (6) is arranged between the second fastening U-shaped clamping head (7) and the test sample (5).
4. The bar material sample constant load stress testing device applied to the corrosive environment according to claim 2, wherein the rectangular frame (1) is made of 316 stainless steel; the width of the rectangular frame (1) is 120-200 mm, the length of the rectangular frame (1) is 200-250 mm, and the beam width of the rectangular frame (1) is 10-30 mm; the diameter of the through hole processed at the top end of the rectangular frame (1) is 4-12 mm, the diameter of the through hole processed at the bottom end of the rectangular frame (1) is 4-12 mm, and the diameter of the through hole processed at the top end of the rectangular frame (1) is the same as that of the through hole processed at the bottom end of the rectangular frame (1).
5. The bar material sample constant load stress testing device applied to the corrosive environment according to claim 2, wherein the material of the loading screw rod (2) is 316 stainless steel, the specification of the loading screw rod (2) is M4-M10, and the length is 80mm-120 mm; an anti-rotation fastening platform is processed in the middle of the loading screw rod (2); the loading nut (3) is an anti-loosening flange nut matched with the loading screw rod (2), and the loading nut (3) is made of 316 stainless steel.
6. The bar material sample constant load stress testing device applied to the corrosive environment according to claim 3, wherein the insulating gasket (6) is made of polytetrafluoroethylene or silicon rubber.
7. A wire or rod specimen constant load stress testing device applied to corrosive environments according to claim 1, characterized in that the test specimen (5) is a wire or rod specimen, and the diameter of the test specimen (5) is 2mm-8 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121721046.4U CN216051110U (en) | 2021-07-27 | 2021-07-27 | Constant load stress testing device for bar and rod test sample applied to corrosive environment |
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| CN202121721046.4U CN216051110U (en) | 2021-07-27 | 2021-07-27 | Constant load stress testing device for bar and rod test sample applied to corrosive environment |
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