Simulation and Verification of Machining Deformation for Composite Materials

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 29; no. 5; pp. 917 - 922
• Main Authors: Liu, Kai, Ye, Jinrui, Tang, Zhanwen, Liu, Weiping, Zhang, Boming
• Format: Journal Article
• Language: English
• Published: Heidelberg Wuhan University of Technology 01.10.2014; Springer Nature B.V
• Subjects: Advanced Materials; Chemistry and Materials Science; Composite materials; Cures; Deformation; Finite element method; Laminates; Machining; Materials Science; Panels; Simulation; Thermal expansion; 仿真结果; 加工变形; 固化动力学; 复合材料加筋板; 复合材料层压板; 模拟方法; 残余应力; 验证; machining deformation; residual stress; finite element analysis (FEA); composite
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-014-1020-6

Prepreg properties including cure kinetics, cure shrinkage, and coefficient of thermal expansion were analyzed. A simulation method based on ＂element birth and death＂ method of Finite element analysis （FEA） was presented to simulate the cutting process and predict the machining deformation for composite laminates and stiffened panels. The comparisons between the simulation results and experimental data showed good agreement. It is found that residual stresses are the main source of machining deformation for composites and machining deformation is expected to happen only if there are stress gradients along the machining direction. There is no machining deformation for composite laminates due to its uniform stresses distribution in plane, while machining deformation can be observed obviously for T-shape stiffened composite panels. Attention should be paid to machining deformation to avoid the mismatch during assembly.