Al/SiC-SiC互锁结构钎焊接头有限元弯曲应力模拟  

Finite element simulation of bending stress in Al/SiC-SiC interlocking structure brazed joints

作　　者：汪小明 张天雷 张子龙[3] 王耿 刘杰 党耀石 王明伟 WANG Xiaoming;ZHANG Tianlei;ZHANG Zilong;WANG Geng;LIU Jie;DANG Yaoshi;WANG Mingwei(School of Materials Science and Engineering,Central South University,Changsha,410083,China;Beijing Institute of Remote Sensing Equipment,Beijing,100854,China;State Key Laboratory of Precision Welding&Joining of Materials and Structures,Harbin Institute of Technology,Harbin,150001,China)

机构地区：[1]中南大学,材料科学与工程学院,长沙410083 [2]北京遥感设备研究所,北京100854 [3]哈尔滨工业大学,材料结构精密焊接与连接国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2025年第2期120-126,共7页Transactions of The China Welding Institution

摘　　要：为了提高空间反射镜结构中Al/SiC镜架与SiC主镜体之间的Al/SiC-SiC异质材料连接的可靠性、缓解残余应力、避免裂纹扩展,采用小尺寸接头互锁结构设计并结合ABAQUS有限元模拟软件,对不同结构、数量和载荷方式下接头的弯曲应力分布及应力峰值进行了模拟计算.结果表明,深宽比为1的钝角型坡口式互锁结构接头的模拟弯曲应力峰值最低,为508 MPa,且该接头中无明显应力集中区域,对接头可靠性优化效果最好.通过钎焊试验进一步验证了该结论,钝角型坡口插接的接头显微形貌无明显缺陷,且其抗弯强度高达198 MPa.To enhance the reliability of Al/SiC-SiC heterogeneous material connections between the Al/SiC mirror frame and the SiC main mirror body in space reflector structures,mitigate residual stress,and prevent crack propagation,a small-scale interlocking joint design was employed.This design was analyzed using the ABAQUS finite element simulation software to simulate and calculate the bending stress distribution and stress peaks under different joint structures,quantities,and loading conditions.The results demonstrate that the trapezoidal groove interlocking joint with an aspect ratio of 1 exhibits the lowest simulated bending stress peak of 508 MPa,with no significant stress concentration areas observed in the joint,indicating optimal reliability optimization.This conclusion was further validated through brazing experiments,which revealed that the trapezoidal groove interlocking joint exhibited no apparent defects in its microstructural morphology and achieved a high bending strength of 198 MPa.

关 键 词：数值模拟 残余应力 异质材料钎焊 结构设计 

分 类 号：TG404[金属学及工艺—焊接]