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By K.J. Hume

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The discrete average stress is introduced into FEM by APDL language. 3 show the uniform mesh used in the FEM. 4 is residual stress and deformation after the fifth layer removal. In the simulation, the part material is removed layer by layer. Each layer is 4mm in thickness. 4 that after shelling, the stresses in the plate are still distributing in layers, which is consistent with the theoretical conclusions. 5, the deflection simulation results as shown in Table 2. 27 Conclusions In this paper, the theory of elastic mechanics are used to analyze the mechanism of the milling deformation due to residual stress, some conclusions have been drawn.

626-632. C. B. M. L. Zhuang: Key Engineering Materials Vols. 197-201. M. D of University of Shanghai for Science and Technology, Shanghai 2009). C. Howland, B. 1508-1518. cn Keywords: residual stress; strain; finite element method Abstract. The key problems in 2D FEM simulation such as the establishment of finite element model, the initial stress loading, the distortion appraisal are solved and 2D FEM simulation model is built to analyze the milling distortion caused by the residual stress. The FEM model is verified by the elasticity theory.

Zhou and J. 172 (2008), p. 372. J. Wang and H. 52. K. R. Rao: Material Science and Engineering A Vol. 1. [15] S. K. Xie, G. Q. Gui, J. H. Huang and H. L. 368. F. H. Huang and M. 40. 5Cu solder; Rare earth element Abstract. 1) solder and Cu substrate during soldering and aging were studied. The results show that Cu6Sn5 IMC is observed at the interface between solder and Cu substrate in all conditions. After aging for 120 h, the Cu3Sn IMC is then obtained. With increasing aging time, the scalloped Cu6Sn5 structure changes to a plate structure.

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