CN103543212A - Test block for carrying out ultrasonic inspection on residual stress of aluminium alloy pre-stretching board by water immersion - Google Patents
Test block for carrying out ultrasonic inspection on residual stress of aluminium alloy pre-stretching board by water immersion Download PDFInfo
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- CN103543212A CN103543212A CN201310534554.5A CN201310534554A CN103543212A CN 103543212 A CN103543212 A CN 103543212A CN 201310534554 A CN201310534554 A CN 201310534554A CN 103543212 A CN103543212 A CN 103543212A
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Abstract
The invention provides a test block for carrying out ultrasonic inspection on residual stress of an aluminium alloy pre-stretching board by water immersion, belonging to the field of non-destructive inspection. A method for preparing the test block comprises the following steps of cutting a sample, processing the sample and installing the sample. In the method, the water immersion method is adopted for inspection, and the temperatures in stress calibration and stress measurement processes can be ensured to be consistent by controlling the water temperature not to be changed, thus eliminating the effects of temperature difference on the ultrasonic wave speed and eliminating temperature errors; besides, an automatic scanning frame is adopted instead of manual scanning, so that the distance between a probe and the surface of a material to be measured in the measurement process can be ensured not to be changed, thus eliminating the effects of coupling condition difference on sound propagation time and eliminating the coupling errors. The method is beneficial to non-destructive evaluation of the near surface residual stress of the aluminium alloy pre-stretching board.
Description
Technical field
The present invention is a kind of test block for aluminum alloy pretensioning plate unrelieved stress immersed ultrasonic test, belongs to field of non destructive testing.
Background technology
In the materials processing operation processes such as forging, welding, thermal treatment, because distortion or the unevenness of thermal cycle usually produce unrelieved stress in material.The existence meeting of unrelieved stress exerts an influence to aspects such as the machining property of material, corrosion stability, fatigabilities, can cause distortion, the cracking of workpiece when serious, affects the normal use of workpiece.Utilizing hyperacoustic " acoustoelectric effect " to measure unrelieved stress is a kind of new method of residual stress measurement.It has the advantages such as measuring speed is fast, easy to use, measurement range flexible, good economy performance, the more important thing is, this method can't harm, and can under the prerequisite of not destroying material residual stress state, measure unrelieved stress, and this is that current most of residual stress measuring method is not available.Although x-ray method also can nondestructive testing of residual stress, its penetration depth is more shallow, cannot measure the stress on nearly surface.Therefore, ultrasonic measurement unrelieved stress is a kind of method that has very much market future.But, due to the mainly measurement based on to ultrasonic propagation velocity of ultrasonic measurement unrelieved stress, and the velocity variations that in different materials, the difference of ultrasonic propagation velocity causes much larger than unrelieved stress in material.Therefore, before the stress in measuring a certain material, need to utilize corresponding test block to measure demarcation, make current ultrasonic residual stress measuring method exist the problem that calibrating procedure complexity and stress can not two aspects of long preservation.On the one hand, existing ultrasonic measurement stress is demarcated and need to be utilized cupping machine to apply certain load to sample, need to prepare special-purpose tensile sample, and the temperature while guaranteeing to load tensile load is identical with measurement temperature, thereby make drawing process comparatively complicated, and rely on cupping machine, equipment needed thereby is complicated.On the other hand, the stress loading during stretching resilience because of sample after unloading disappears, and the stress in sample can not be preserved for a long time, and this brings very large inconvenience also to the surveying work of unrelieved stress.Therefore, need to develop a kind of easy to use and test block that contains known unrelieved stress that can preserve for a long time.
Summary of the invention
The present invention designs a kind of test block for aluminum alloy pretensioning plate unrelieved stress immersed ultrasonic test is provided for above-mentioned problems of the prior art just, its objective is the accuracy of detection and the degree of depth that improve the nearly surface residual stress of aluminum alloy pretensioning plate, can reach ± 40MPa of precision, the degree of depth can reach 8mm.
The object of the invention is to be achieved through the following technical solutions:
This kind, for the test block of aluminum alloy pretensioning plate unrelieved stress immersed ultrasonic test, is characterized in that: the making step of this test block is:
(1) cut sample
On the product with pre-stretching plate to be measured (13) same batch, cut a block length 100mm, wide 90mm, the rectangular specimen of thick 20mm, a rolling surface that maximized surface is pretensioning plate of rectangular specimen, this maximized surface claims sample rolling surface (5), the length side of rectangular specimen is identical with the rolling direction of pretensioning plate, utilize boring method to measure the unrelieved stress of sample rolling surface (1), the quantity of measurement point is four, its position is apart from the long limit 10mm of sample rolling surface (5), broadside 15mm, by being followed successively by clockwise measurement point I (1), measurement point II (2), measurement point III (3), measurement point IV (4), the maximum residual stress value of each measurement point should be less than 50MPa,
(2) sample processing
Rectangular specimen is cut into large and small two samples, bulk sample is of a size of: long 100mm, wide 60mm, thick 20mm, pat is of a size of: long 40.01～40.10mm, wide 19.95～19.99mm, thick 20mm, at the center of bulk sample, process a long 40mm, the square through hole of wide 20mm (6), the length direction of this square through hole (6) is identical with the length direction of bulk sample, and pat length direction is consistent with the length direction of rectangular specimen before processing, and pat and square through hole form interference fit between (6);
(3) sample is installed
Bulk sample and pat is fully cooling in liquid nitrogen, after taking out, rapidly pat is arranged in the square through hole (6) of bulk sample, temperature after being elevated to room temperature polishes each face of the assembly of bulk sample and pat, assembly after polishing is called test block (9), utilize boring method to measure in test block (9) not the unrelieved stress with the maximized surface center of sample rolling surface (5), measurement result is identified in test block (9);
(4) repeat above step and (1), (2), (3) make 3 test blocks (9) for checking the unrelieved stress of the pretensioning plate of same batch.
Principle of work of the present invention is:
The present invention is utilizing cupping machine to demarcate on the basis of ultrasonic measurement of stress method, has proposed to utilize the method for cooling installation interference fit to make the method for making for the test block of material residual stress ultrasonic measurement.
Due to ultrasonic measurement unrelieved stress, must utilize corresponding test block and measure demarcation, make current ultrasonic residual stress measuring method exist the problem that the complicated and stress of calibrating procedure can not two aspects of long preservation.On the one hand, existing ultrasonic measurement stress is demarcated and need to be utilized cupping machine to apply certain load to sample, need to prepare special-purpose tensile sample, and the temperature while guaranteeing to load tensile load is identical with measurement temperature, thereby make drawing process comparatively complicated, and rely on cupping machine, equipment needed thereby is complicated.On the other hand, the stress loading during stretching resilience because of sample after unloading disappears, and the stress in sample can not be preserved for a long time, and this brings very large inconvenience also to the surveying work of unrelieved stress.
For first problem, adopt cooling installation interference sample to manufacture unrelieved stress, by controlling the size of the magnitude of interference, make to produce in test block the unrelieved stress of different sizes, thereby break away from the dependence to cupping machine, utilize this test block can complete fast stress staking-out work.
For Second Problem, adopt cooling installation interference test block to manufacture unrelieved stress, test block is permanent in the situation that not being subject to larger external force or higher temperature keeps certain stress state, thus it is more quick to make to measure staking-out work.
Advantage of the present invention is: propose a kind of test block for aluminum alloy pretensioning plate unrelieved stress immersed ultrasonic test, be conducive to the nearly surface residual stress of aluminum alloy pretensioning plate to carry out Nondestructive Evaluation.Make to detect and have that detection speed is fast, the advantages such as large good economy performance fathom.
Accompanying drawing explanation
Fig. 1 is rectangular specimen sampling mode and residual stress measurement point position view
Fig. 2 is bulk sample structure and form schematic diagram
Fig. 3 is the schematic diagram of pat
Fig. 4 is test block structural representation
Fig. 5 is checkout equipment one-piece construction schematic diagram
Fig. 6 is the scan mode schematic diagram of ultrasonic water immersion probe
Embodiment
Below with reference to drawings and Examples, technical solution of the present invention is further described:
Embodiment 1
The trade mark is the aluminum alloy pretensioning plate of 7050-T7451, and longitudinal wave velocity is wherein 3200m/s, length 500mm, and width 450mm, thickness 160mm, requires to detect the unrelieved stress in nearly surperficial 2mm.Its detecting step is as follows:
(1) make reference block
1.1 cut sample
On the product with pre-stretching plate 13 same batch to be measured, cut a block length 100mm, wide 90mm, the rectangular specimen of thick 20mm, a rolling surface that maximized surface is pretensioning plate of rectangular specimen, this maximized surface claims sample rolling surface 5, the length side of rectangular specimen is identical with the rolling direction of pretensioning plate, utilize boring method to measure the unrelieved stress of sample rolling surface 1, the quantity of measurement point is four, its position is apart from the long limit 10mm of sample rolling surface 1, broadside 15mm, by being followed successively by clockwise measurement point I 1, measurement point II 2, measurement point III 3, measurement point IV 4, as the maximum residual stress value recording is not more than 50MPa and retains this sample, as be greater than 50MPa and resample, until obtain the sample that maximum stress value is less than 50MPa,
1.2 sample processing
Rectangular specimen is cut into large and small two samples, bulk sample is of a size of: long 100mm, wide 60mm, thick 20mm, pat is of a size of: long 40.01～40.10mm, wide 19.95～19.99mm, thick 20mm, at the center of bulk sample, process a long 40mm, the square through hole 6 of wide 20mm, the length direction of this square through hole 6 is identical with the length direction of bulk sample, and pat length direction is consistent with the length direction of rectangular specimen before processing, between pat and square through hole 6, forms interference fit;
1.3 samples are installed
Bulk sample and pat is fully cooling in liquid nitrogen, after taking out, rapidly pat is arranged in the square through hole 6 of bulk sample, temperature after being elevated to room temperature polishes each face of the assembly of bulk sample and pat, assembly after polishing is called test block 9, utilize boring method to measure in test block 9 not the unrelieved stress with the maximized surface center of sample rolling surface 1, measurement result is identified in test block 9;
1.4 repeat above step 1.1,1.2,1.3, make 3 test blocks 9 for checking the unrelieved stress of the pretensioning plate of same batch;
(2) measure and demarcate
2.1 equipment are installed
Select two frequencies to be all the ultrasonic water immersion probe 7 of 5MHz, ultrasonic water immersion probe 7 is arranged on scanning frame 8, two ultrasonic water immersion probes 7 are on same surface level, two ultrasonic water immersions probe 7 center line 8 in same vertical plane, intersect, the center line 8 of two ultrasonic water immersion probes 7 is 28 ° with the angle of vertical direction, opposite direction, a ultrasonic water immersion probe 7 is connected to the interface that excites of electric pulse signal generator 10, another ultrasonic water immersion probe 7 connects the input interface of dual channel oscilloscope 11, the output interface of electric pulse signal generator 10, the input interface of sync cap and dual channel oscilloscope 11, sync cap is corresponding to be connected, test block 9 levels are placed on the sample bench 12 in tank 14, two ultrasonic water immersions probe 7 be placed in test block 9 directly over both sides,
2.2 determine measurement parameter
Open electric pulse signal generator 10 and dual channel oscilloscope 11, by adjust two ultrasonic water immersions probe 7 angle of inclination and and test block 9 between horizontal range, the critical refraction longitudinal wave signal that dual channel oscilloscope 11 is gathered is maximum, read and record the transmitted wave showing on dual channel oscilloscope 11 and receive the time interval between ripple, change test block 9, the angle of inclination that keeps two ultrasonic water immersions probe 7 is constant with the relative position of itself and test block 9, all test blocks 9 are read and recorded the transmitted wave showing on dual channel oscilloscope 11 and receive the time interval between ripple, the unrelieved stress at maximized surface center of the test block 9 of measuring in step 1.3 of take is ordinate, take the time interval as horizontal ordinate, at rectangular coordinate, fasten and draw unrelieved stress and time interval relation curve, curve is carried out to linear fit, after matching, the slope of straight line is called sonoelastic coefficient K, the intercept of this straight line on horizontal ordinate is called zero stress time t
0,
2.3 residual stress measurement
From sample bench 12, take off test block 9, aluminum alloy pretensioning plate 13 to be measured is placed on sample bench 12, the angle of inclination that keeps two ultrasonic water immersions probe 7 is consistent during with measurement test block 9, and the horizontal range that makes two ultrasonic water immersions probe 7 and aluminum alloy pretensioning plate 13 to be measured is consistent during with measurement test block 9, make scanning frame 8 drive 7 pairs of aluminum alloy pretensioning plates 13 to be measured of two ultrasonic water immersion probes to line by line scan, in every line scanning process, the probe 30mm that often advances reads and records on a dual channel oscilloscope 11 time interval between the transmitted wave that shows and reception ripple, distance between every row is 15mm, until whole pretensioning plate been scanned,
2.4 calculate unrelieved stress
The unrelieved stress of aluminum alloy pretensioning plate 13 each measurement points of surface to be measured is calculated with following formula:
σ
ri＝K(t
i-t
0)
In formula: σ
rithe unrelieved stress that represents every bit place, K represents sonoelastic coefficient, t
irepresent the transmitted wave that every bit place records and receive the time interval between ripple, t
0represent the zero stress time.
2.5 mark unrelieved stresss
The region that the residual-stress value recording is greater than to 100MPa marks on sample, completes the measurement of unrelieved stress.
The trade mark is the aluminum alloy pretensioning plate of 7050-T7451, and longitudinal wave velocity is wherein 3200m/s, length 600mm, and width 400mm, thickness 140mm, requires to detect the unrelieved stress in nearly surperficial 4mm.Its detecting step is as follows:
(1) make reference block
1.1 cut sample
On the product with pre-stretching plate 13 same batch to be measured, cut a block length 100mm, wide 90mm, the rectangular specimen of thick 20mm, a rolling surface that maximized surface is pretensioning plate of rectangular specimen, this maximized surface claims sample rolling surface 5, the length side of rectangular specimen is identical with the rolling direction of pretensioning plate, utilize boring method to measure the unrelieved stress of sample rolling surface 1, the quantity of measurement point is four, its position is apart from the long limit 10mm of sample rolling surface 1, broadside 15mm, by being followed successively by clockwise measurement point I 1, measurement point II 2, measurement point III 3, measurement point IV 4, as the maximum residual stress value recording is not more than 50MPa and retains this sample, as be greater than 50MPa and resample, until obtain the sample that maximum stress value is less than 50MPa,
1.2 sample processing
Rectangular specimen is cut into large and small two samples, bulk sample is of a size of: long 100mm, wide 60mm, thick 20mm, pat is of a size of: long 40.01～40.10mm, wide 19.95～19.99mm, thick 20mm, at the center of bulk sample, process a long 40mm, the square through hole 6 of wide 20mm, the length direction of this square through hole 6 is identical with the length direction of bulk sample, and pat length direction is consistent with the length direction of rectangular specimen before processing, between pat and square through hole 6, forms interference fit;
1.3 samples are installed
Bulk sample and pat is fully cooling in liquid nitrogen, after taking out, rapidly pat is arranged in the square through hole 6 of bulk sample, temperature after being elevated to room temperature polishes each face of the assembly of bulk sample and pat, assembly after polishing is called test block 9, utilize boring method to measure in test block 9 not the unrelieved stress with the maximized surface center of sample rolling surface 1, measurement result is identified in test block 9;
1.4 repeat above step 1.1,1.2,1.3, make 3 test blocks 9 for checking the unrelieved stress of the pretensioning plate of same batch;
(2) measure and demarcate
2.1 equipment are installed
Select two frequencies to be all the ultrasonic water immersion probe 7 of 2.25MHz, ultrasonic water immersion probe 7 is arranged on scanning frame 8, two ultrasonic water immersion probes 7 are on same surface level, two ultrasonic water immersions probe 7 center line 8 in same vertical plane, intersect, the center line 8 of two ultrasonic water immersion probes 7 is 28 ° with the angle of vertical direction, opposite direction, a ultrasonic water immersion probe 7 is connected to the interface that excites of electric pulse signal generator 10, another ultrasonic water immersion probe 7 connects the input interface of dual channel oscilloscope 11, the output interface of electric pulse signal generator 10, the input interface of sync cap and dual channel oscilloscope 11, sync cap is corresponding to be connected, test block 9 levels are placed on the sample bench 12 in tank 14, two ultrasonic water immersions probe 7 be placed in test block 9 directly over both sides,
2.2 determine measurement parameter
Open electric pulse signal generator 10 and dual channel oscilloscope 11, by adjust two ultrasonic water immersions probe 7 angle of inclination and and test block 9 between horizontal range, the critical refraction longitudinal wave signal that dual channel oscilloscope 11 is gathered is maximum, read and record the transmitted wave showing on dual channel oscilloscope 11 and receive the time interval between ripple, change test block 9, the angle of inclination that keeps two ultrasonic water immersions probe 7 is constant with the relative position of itself and test block 9, all test blocks 9 are read and recorded the transmitted wave showing on dual channel oscilloscope 11 and receive the time interval between ripple, the unrelieved stress at maximized surface center of the test block 9 of measuring in step 1.3 of take is ordinate, take the time interval as horizontal ordinate, at rectangular coordinate, fasten and draw unrelieved stress and time interval relation curve, curve is carried out to linear fit, after matching, the slope of straight line is called sonoelastic coefficient K, the intercept of this straight line on horizontal ordinate is called zero stress time t
0,
2.3 residual stress measurement
From sample bench 12, take off test block 9, aluminum alloy pretensioning plate 13 to be measured is placed on sample bench 12, the angle of inclination that keeps two ultrasonic water immersions probe 7 is consistent during with measurement test block 9, and the horizontal range that makes two ultrasonic water immersions probe 7 and aluminum alloy pretensioning plate 13 to be measured is consistent during with measurement test block 9, make scanning frame 8 drive 7 pairs of aluminum alloy pretensioning plates 13 to be measured of two ultrasonic water immersion probes to line by line scan, in every line scanning process, the probe 20mm that often advances reads and records on a dual channel oscilloscope 11 time interval between the transmitted wave that shows and reception ripple, distance between every row is 20mm, until whole pretensioning plate been scanned,
2.4 calculate unrelieved stress
The unrelieved stress of aluminum alloy pretensioning plate 13 each measurement points of surface to be measured is calculated with following formula:
σ
ri＝K(t
i-t
0)
In formula: σ
rithe unrelieved stress that represents every bit place, K represents sonoelastic coefficient, t
irepresent the transmitted wave that every bit place records and receive the time interval between ripple, t
0represent the zero stress time.
2.5 mark unrelieved stresss
The region that the residual-stress value recording is greater than to 100MPa marks on sample, completes the measurement of unrelieved stress.
The trade mark is the aluminum alloy pretensioning plate of 7050-T7451, and longitudinal wave velocity is wherein 3200m/s, length 600mm, and width 500mm, thickness 80mm, requires to detect the unrelieved stress in nearly surperficial 8mm.Its detecting step is as follows:
(1) make reference block
1.1 cut sample
On the product with pre-stretching plate 13 same batch to be measured, cut a block length 100mm, wide 90mm, the rectangular specimen of thick 20mm, a rolling surface that maximized surface is pretensioning plate of rectangular specimen, this maximized surface claims sample rolling surface 5, the length side of rectangular specimen is identical with the rolling direction of pretensioning plate, utilize boring method to measure the unrelieved stress of sample rolling surface 1, the quantity of measurement point is four, its position is apart from the long limit 10mm of sample rolling surface 1, broadside 15mm, by being followed successively by clockwise measurement point I 1, measurement point II 2, measurement point III 3, measurement point IV 4, as the maximum residual stress value recording is not more than 50MPa and retains this sample, as be greater than 50MPa and resample, until obtain the sample that maximum stress value is less than 50MPa,
1.2 sample processing
Rectangular specimen is cut into large and small two samples, bulk sample is of a size of: long 100mm, wide 60mm, thick 20mm, pat is of a size of: long 40.01～40.10mm, wide 19.95～19.99mm, thick 20mm, at the center of bulk sample, process a long 40mm, the square through hole 6 of wide 20mm, the length direction of this square through hole 6 is identical with the length direction of bulk sample, and pat length direction is consistent with the length direction of rectangular specimen before processing, between pat and square through hole 6, forms interference fit;
1.3 samples are installed
Bulk sample and pat is fully cooling in liquid nitrogen, after taking out, rapidly pat is arranged in the square through hole 6 of bulk sample, temperature after being elevated to room temperature polishes each face of the assembly of bulk sample and pat, assembly after polishing is called test block 9, utilize boring method to measure in test block 9 not the unrelieved stress with the maximized surface center of sample rolling surface 1, measurement result is identified in test block 9;
1.4 repeat above step 1.1,1.2,1.3, make 3 test blocks 9 for checking the unrelieved stress of the pretensioning plate of same batch;
(2) measure and demarcate
2.1 equipment are installed
Select two frequencies to be all the ultrasonic water immersion probe 7 of 1MHz, ultrasonic water immersion probe 7 is arranged on scanning frame 8, two ultrasonic water immersion probes 7 are on same surface level, two ultrasonic water immersions probe 7 center line 8 in same vertical plane, intersect, the center line 8 of two ultrasonic water immersion probes 7 is 28 ° with the angle of vertical direction, opposite direction, a ultrasonic water immersion probe 7 is connected to the interface that excites of electric pulse signal generator 10, another ultrasonic water immersion probe 7 connects the input interface of dual channel oscilloscope 11, the output interface of electric pulse signal generator 10, the input interface of sync cap and dual channel oscilloscope 11, sync cap is corresponding to be connected, test block 9 levels are placed on the sample bench 12 in tank 14, two ultrasonic water immersions probe 7 be placed in test block 9 directly over both sides,
2.2 determine measurement parameter
Open electric pulse signal generator 10 and dual channel oscilloscope 11, by adjust two ultrasonic water immersions probe 7 angle of inclination and and test block 9 between horizontal range, the critical refraction longitudinal wave signal that dual channel oscilloscope 11 is gathered is maximum, read and record the transmitted wave showing on dual channel oscilloscope 11 and receive the time interval between ripple, change test block 9, the angle of inclination that keeps two ultrasonic water immersions probe 7 is constant with the relative position of itself and test block 9, all test blocks 9 are read and recorded the transmitted wave showing on dual channel oscilloscope 11 and receive the time interval between ripple, the unrelieved stress at maximized surface center of the test block 9 of measuring in step 1.3 of take is ordinate, take the time interval as horizontal ordinate, at rectangular coordinate, fasten and draw unrelieved stress and time interval relation curve, curve is carried out to linear fit, after matching, the slope of straight line is called sonoelastic coefficient K, the intercept of this straight line on horizontal ordinate is called zero stress time t
0,
2.3 residual stress measurement
From sample bench 12, take off test block 9, aluminum alloy pretensioning plate 13 to be measured is placed on sample bench 12, the angle of inclination that keeps two ultrasonic water immersions probe 7 is consistent during with measurement test block 9, and the horizontal range that makes two ultrasonic water immersions probe 7 and aluminum alloy pretensioning plate 13 to be measured is consistent during with measurement test block 9, make scanning frame 8 drive 7 pairs of aluminum alloy pretensioning plates 13 to be measured of two ultrasonic water immersion probes to line by line scan, in every line scanning process, the probe 30mm that often advances reads and records on a dual channel oscilloscope 11 time interval between the transmitted wave that shows and reception ripple, distance between every row is 20mm, until whole pretensioning plate been scanned,
2.4 calculate unrelieved stress
The unrelieved stress of aluminum alloy pretensioning plate 13 each measurement points of surface to be measured is calculated with following formula:
σ
ri＝K(t
i-t
0)
In formula: σ
rithe unrelieved stress that represents every bit place, K represents sonoelastic coefficient, t
irepresent the transmitted wave that every bit place records and receive the time interval between ripple, t
0represent the zero stress time.
2.5 mark unrelieved stresss
The region that the residual-stress value recording is greater than to 150MPa marks on sample, completes the measurement of unrelieved stress.
Claims (1)
1. for a test block for aluminum alloy pretensioning plate unrelieved stress immersed ultrasonic test, it is characterized in that: the making step of this test block is:
(1) cut sample
On the product with pre-stretching plate to be measured (13) same batch, cut a block length 100mm, wide 90mm, the rectangular specimen of thick 20mm, a rolling surface that maximized surface is pretensioning plate of rectangular specimen, this maximized surface claims sample rolling surface (5), the length side of rectangular specimen is identical with the rolling direction of pretensioning plate, utilize boring method to measure the unrelieved stress of sample rolling surface (1), the quantity of measurement point is four, its position is apart from the long limit 10mm of sample rolling surface (5), broadside 15mm, by being followed successively by clockwise measurement point I (1), measurement point II (2), measurement point III (3), measurement point IV (4), the maximum residual stress value of each measurement point should be less than 50MPa,
(2) sample processing
Rectangular specimen is cut into large and small two samples, bulk sample is of a size of: long 100mm, wide 60mm, thick 20mm, pat is of a size of: long 40.01～40.10mm, wide 19.95～19.99mm, thick 20mm, at the center of bulk sample, process a long 40mm, the square through hole of wide 20mm (6), the length direction of this square through hole (6) is identical with the length direction of bulk sample, and pat length direction is consistent with the length direction of rectangular specimen before processing, and pat and square through hole form interference fit between (6);
(3) sample is installed
Bulk sample and pat is fully cooling in liquid nitrogen, after taking out, rapidly pat is arranged in the square through hole (6) of bulk sample, temperature after being elevated to room temperature polishes each face of the assembly of bulk sample and pat, assembly after polishing is called test block (9), utilize boring method to measure in test block (9) not the unrelieved stress with the maximized surface center of sample rolling surface (5), measurement result is identified in test block (9);
(4) repeat above step and (1), (2), (3) make 3 test blocks (9) for checking the unrelieved stress of the pretensioning plate of same batch.
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| CN104597137A (en) * | 2014-12-31 | 2015-05-06 | 广西南南铝加工有限公司 | Ultrasonic testing block group for residual stress of aluminum alloy prestretching plate and application method thereof |
| CN105738017A (en) * | 2016-02-29 | 2016-07-06 | 江苏科技大学 | Method for correcting evaluation on stress on surface layer of metal material by ultrasonic wave due to element content influence |
| CN106017763A (en) * | 2016-05-20 | 2016-10-12 | 西南交通大学 | Supersonic residual stress measuring method capable of correcting influence of microscopic organization difference |
| CN108827533A (en) * | 2018-09-03 | 2018-11-16 | 杭州戬威机电科技有限公司 | A kind of explosive residual stress supersonic testing method sound bullet factor calibration device |
| CN109029840A (en) * | 2018-09-03 | 2018-12-18 | 杭州戬威机电科技有限公司 | A kind of explosive residual stress supersonic testing method sound bullet coefficient scaling method |
| CN111595498A (en) * | 2020-05-25 | 2020-08-28 | 东南大学 | Method for measuring welding residual stress |
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