Aluminum alloy pre-stretched plate residual stress ultrasonic testing test block group and its application method

Abstract

The invention belongs to the nondestructive testing field and provides an ultrasonic testing block group for residual stress of aluminum alloy prestretching plate and an application method thereof. The testing block is selected from the aluminum alloy prestretching plate in the same batch, and the length direction of the testing block and the plate rolling direction are the same, the testing block is 50-2000mm in width and 200-8000mm in length; the testing block group is at least composed of two testing blocks, namely a testing block combination and parallel testing blocks B; the number of the testing blocks is not less than 2 and each testing block group comprises the testing blocks corresponding to different residual stress of the groups, the different residual stress is distributed in a gradient mode; the parallel testing blocks B are the marking testing block group of the residual stress value and the testing block combination is the standardization testing block group of a residual stress ruler. The complex machining and assembling are not required for the sample, so that the cost is saved and the test block preparation success rate is increased, the method is useful for having nondestructive evaluation on the near surface residual stress of the aluminum alloy prestretching plate.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and relates to a test block set for ultrasonic testing of residual stress of an aluminum alloy pre-stretched plate and a use method thereof. Background technique [0002] In the process of rolling, solution quenching, etc., the pre-stretched aluminum alloy sheet often produces residual stress. The existence of residual stress directly leads to the deformation of the workpiece due to the release of residual stress in the subsequent use process. Pre-stretched aluminum alloy The residual stress in the plate may be caused by the rolling process, but the main reason is the solution quenching process of the aluminum alloy. [0003] Manufacturers of flat-rolled aluminum alloy products often use large-tonnage pre-stretching machines to treat the aluminum alloy sheets after solution quenching to reduce the residual stress in the sheets. The modern aviation manufacturing industry puts forward low re...

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Problems solved by technology

This method requires complex machining of the sample; and the combined test block needs to be cooled to an assembleable size with liquid nitrogen before installation, and the assembly process needs to be fast and accurate, which has high requirements for the operating ability of the operator; After the test block is installed, the operator needs to grind the plane of the combined test block until the two surfaces are parallel and smooth, which is technically difficult and may introduce new residual stress

[0006] The method introduced in the 201410073705.6 patent is mainly applicable to steel. In the process of making the test block of this invention, the outer ring should be heated under the premise of ensuring that the material does not change, and then the outer ring should be compressed by the effect of thermal expansion and contraction. Inner disc; but the heat-treatable aluminum alloy is sensitive to temperature, and the effect of artificial aging treatment will be produced at about 120°C, which makes it difficult to apply the invention to the detection of aluminum alloy materials

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