Slope Measurement Method for Three-dimensional Residual Stress in 7075-T651 Aluminum Alloy Plate

doi:10.3969/j.issn.1000-1093.2021.09.021

Abstract

Abstract: In order to improve the performance and reliability of airplane and reduce its weight，the aluminum alloy monolithic structure parts are increasingly used in the aviation industry. The initial residual stress (IRS) is a crucial factor influencing the machining deformation of aluminum alloy monolithic structure parts. The effective research on deformation depends on the accurate and efficient measurements of IRS. The traditional layer-removed method for the residual stress measurement is time consuming as it requires the repeated gluing and removing of strain gauge. An innovative slope method is proposed to measure the three-dimensional IRS of the pre-stretched aluminum alloy plate. The measured results must be modified in order to reduce the measurement errors. The profiles of residual stress measured by two methods are like double M type curves. The slope method raises the measurement efficiency by tenfold compared with the traditional layer-removed method. About 90% of all the absolute errors of residual stress corrected by two methods are within 6 MPa. The slope method is used to measure the residual stress across the thickness of workpiece, and also abtain the residual stress of subsurface within 20 μm.

Key words: aluminumalloyplate, residualstress, modifiedstress, slopemethod, layer-removedmethod

CLC Number:

WANG Zibiao， SUN Jianfei， LI Tian， ZHANG Liren， ZHANG Shengwei. Slope Measurement Method for Three-dimensional Residual Stress in 7075-T651 Aluminum Alloy Plate[J]. Acta Armamentarii, 2021, 42(9): 2004-2012.

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