关键词: 残余应力, 加工变形, 模拟, 有限元

Abstract: Based on theoretical calculation and finite element simulation, the influence of original residual stress on the machining distortion of large unitization airframe is studied. The deformation deflection of the rectangular section beam, which is acted by one direction residual stress, is calculated while the material is removed. The theoretical solution agreed well with the finite element result. Cater to the engineering application, the effect of residual stress on machining distortion of frame unitization part is simulated by employing ABAQUS software. An experiment is conducted to validate the FEM result. Good agreement is found between the finite element result and the experiment values. Finally, upon the simulation result of the machining distortion, manufacturing process is put forward to improve machining precision of unitization airframe.

Key words: Finite element, Machining distortion, Residual stress, Simulation