A method and device for non-destructive testing of aluminum alloy residual stress
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A technology of residual stress and non-destructive testing, applied in the direction of force/torque/work measuring instruments, measuring devices, instruments, etc., can solve problems such as difficult to meet high standards, impact, etc., to improve accuracy and repeatability, detection High sensitivity, excellent accuracy and reproducible results
Active Publication Date: 2021-09-07
广西南南铝加工有限公司
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[0008] The ultrasonic attenuation measurement correction (compensation) technology used in the prior art is not only affected by the microstructure, but also by the quality of the surface to be tested, the pressure of the probe and other factors, resulting in the effect of correction (compensation) being affected, which is difficult to meet the increasing demands of people. high standard requirements
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Embodiment 1
[0044]This preferred embodiment provides a method for non-destructive detection of aluminum alloy residual stress, comprising the following steps:
[0045] S1. Prepare nearly zero residual stress samples parallel to the main deformation direction A of the aluminum alloy, a total of 20 groups, named A 0 , A 1 , A 2 , A 3 ,...,A 18 , A 19 ; The number of samples in each group is 5 parallel samples, and the final result is the arithmetic mean of the test results of parallel samples. The shape of the sample is dumbbell-shaped, the thickness of the sample is 20mm, the total length is 240mm, and the radius of the transition arc is 40mm; the near-zero residual stress sample is first subjected to vibration aging method, and then the method of stress relief annealing is used to reduce the residual stress.
[0046] S2, preparing samples in different annealing states, the near-zero residual stress sample A prepared in step S1 0 , A 1 , A 2 , A 3 ,...,A 18 , A 19 Annealing acco...
Embodiment 2
[0065] This preferred embodiment provides a method for non-destructive detection of aluminum alloy residual stress, comprising the following steps:
[0066] S1. Preparation of near-zero residual stress samples parallel to the main deformation direction A of the aluminum alloy, a total of 16 groups, named A 0 , A 1 , A 2 , A 3 ,...,A 14 , A 15 ; The number of samples in each group is 5 parallel samples, and the final result is the arithmetic mean of the test results of parallel samples. The shape of the sample is dumbbell-shaped, the thickness of the sample is 25mm, the total length is 250mm, and the radius of the transition arc is 45mm; the near-zero residual stress sample is first mechanically stretched to reduce the residual stress, and then the high-energy ultrasonic beam is used to reduce the residual stress.
[0067] S2, preparing samples in different annealing states, the near-zero residual stress sample A prepared in step S1 0 , A 1 , A 2 , A 3 ,...,A 14 , A ...
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Abstract
The invention discloses a non-destructive detection method for aluminum alloy residual stress, which relates to the technical field of non-destructive detection. By preparing samples with near-zero residual stress parallel to and perpendicular to the main deformation direction of aluminum alloy respectively, the samples are subjected to different annealing treatments, and the return status of the samples is established. The electrical conductivity database and the establishment of the first stress-acoustic time difference database and the second stress-acoustic time difference database, and then conduct conductivity testing on the aluminum alloys that are actually to be tested for residual stress non-destructively, and obtain the corresponding values in the annealing state-conductivity database. Annealing state, input the annealing state into the first stress-acoustic time-difference database and the second stress-acoustic time-difference database to obtain the corresponding stress-acoustic time-difference curve, collect the acoustic time-difference data of the detected position of the aluminum alloy parallel and perpendicular to the main deformation direction of the aluminum alloy, Finally, the collected acoustic time difference data are brought into the stress-acoustic time difference curve to obtain the corresponding residual stress. The invention can realize high-precision and repeatable non-destructive testing.
Description
technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to a method and equipment for nondestructive testing of aluminum alloy residual stress. Background technique [0002] Due to the advantages of low density, high specific strength, high fracture toughness, good corrosion resistance, and high damage tolerance, aluminum alloys are widely used in aviation and aerospace fields. In the process of billet production, parts processing and service, aluminum alloy materials may produce different types and degrees of residual stress due to external factors such as temperature field and force field. Residual stress is the main cause of shape and position tolerance, machining deformation and brittle fracture of materials during service, which has attracted extensive attention in engineering circles. Using non-destructive testing methods to quickly and conveniently measure the residual stress of aluminum alloy materials is the basi...
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