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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (2): 574-581.doi: 10.7527/S1000-6893.2013.0469

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

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

YANG Yinfei, ZHANG Zheng, LI Liang, HE Ning, ZHAO Wei   

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2013-09-05 Revised:2013-11-16 Online:2014-02-25 Published:2013-11-20
  • Supported by:

    Defense Industrial Technology Development Program (C1520120002, J1520130001); Research Fund for the Doctoral Program of Higher Education of China (20123218120025); The Fundamental Research Funds for the Central Universities (NS2012011)

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: