7085铝合金残余应力及加工变形的数值仿真与试验

doi:10.7527/S1000-6893.2013.0469

Abstract

Abstract:

Bulk residual stress and machining distortion of aluminum parts are major concerns in the manufacturing of aerospace monolithic components. The quenching and cold compression residual stresses of main support device for landing gear made from aluminum alloy 7085 are simulated using MSC.Marc software. The surface residual stress of specimen is measured using both X-ray diffraction and hole drilling method. By comprising residual stress between simulation and measurement, residual stress simulation is corrected using least squares method (LSM). Then the machining distortion simulation and experiment are carried out on scaled part based on the coefficient corrected residual stress. The results indicate that the stress distribution tendencies in specimen are quite similar between simulation and measurement; X-ray diffraction and hole drilling method results are found in a good agreement with each other; the analytical accuracy based on the corrected residual stress using LSM is enhanced by about 50% on predicting machining distortion. Machining distortion can be mainly attributed to bulk residual stress within material.

Key words: residual stresses, machining distortion, X-ray diffraction, hole drilling method, coefficient modification

CLC Number:

YANG Yinfei, ZHANG Zheng, LI Liang, HE Ning, ZHAO Wei. Numerical Simulation and Test of Bulk Residual Stress and Machining Distortion in Aluminum Alloy 7085[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(2): 574-581.

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Numerical Simulation and Test of Bulk Residual Stress and Machining Distortion in Aluminum Alloy 7085

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