Finite Element Analysis of Stress Field of C/C Composite Brazed Joint
LI Shengnan1,2,3, LU Quanbin3, DU Dong1, SUN Huawei4, ZHOU Xusheng3, LONG Weimin1,3,4,*
1 Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China 2 State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, China 3 State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou 450001, China 4 China Academy of Machinery Ningbo Academy of Intelligent Machine Tool Co., Ltd., Ningbo 315700, Zhejiang, China
Abstract: Residual stress in brazed joint of dissimilar materials is one of the main reasons which result in low joint quality. The magnitude and distribution of residual stress in brazed joints of C/C composite and C/C composite, C/C composite and TiAl alloy were studied by numerical simulation method based on thermal-elastic-plastic theory and finite element software Abaqus as a platform. Furthermore, the influence of stress distribution on joint performance was revealed. Different Von Mises stress distribution and state appeared in different brazed joints. In C/C-C/C brazed joint, Von Mises stress was concentrated at the brazing seam, the edges and corners of C/C composite’s brazed surface, and gradually decreased from the outside to the inside. In C/C-TiAl brazed joint, the stress was concentrated on C/C composite where adjacent the brazing seam, and gradually decreased from inside to outside. The joint strength of brazed joint was mainly affected by the axial normal stress and the shear stress perpendicular to the axial direction. The residua stress of C/C-C/C brazed joint was lower, its axial tensile stress was almost zero, therefore the join strength of brazed joint was mainly affected by the shear stress. The residual stress of C/C-TiAl brazed joint was much higher, in C/C composite the maximum axial tensile stress was distributed at the edges, and the maximum shear stress was distributed inside of the brazed surface.
李胜男, 路全彬, 都东, 孙华为, 周许升, 龙伟民. C/C复合材料钎焊接头应力场的有限元分析[J]. 材料导报, 2023, 37(1): 21120062-5.
LI Shengnan, LU Quanbin, DU Dong, SUN Huawei, ZHOU Xusheng, LONG Weimin. Finite Element Analysis of Stress Field of C/C Composite Brazed Joint. Materials Reports, 2023, 37(1): 21120062-5.
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2023, Vol. 37 
