CFRP车身T型接头静态失效性能与机制

《复合材料学报》优先在线发表论文。

摘  要：通过解析预测、有限元分析和试验手段对热塑性碳纤维增强聚合物基复合材料(CFRP) T型接头的面外弯曲和弯扭耦合力学性能进行研究，分析了T型接头的结构失效形式与力-位移曲线的关系，并将解析模型、有限元仿真与试验结果进行对比。在弯曲刚度方面，解析模型、有限元分析结果相对试验结果的刚度误差分别为4.7%和0.5%。在弯扭耦合刚度方面，解析模型及有限元仿真的结果相对试验结果的弯扭耦合刚度误差分别为6.9%和9.6%。试验结果表明，碳纤维层合板的渐进失效引起T型接头弯曲刚度的衰减，当力达到2047N时接头开始发生失效，失效形式包括纤维的断裂、缠绕，树脂的压碎以及纤维和树脂的分层等。

关键词：热塑碳纤维增强聚合物基复合材料；单冒型T型接头；力学性能；理论预测；有限元分析；弯扭......耦合

Abstract: This paper presents an analytical, FE and experimental study on mechanical behavior of thermoplastic (carbon fiber reinforced plastics) CFRP T-joint subjected to out-of-plane bending and bending-torsion coupling. The relationship between failure mode and load-displacement curve was analyzed. The analytical, FE and experimental results were compared. In bending test, the stiffness discrepancies in analytical and FE model compared to that in the experiment are 4.7% and 0.5%, respectively. In bending-torsion test, the stiffness discrepancies in analytical and FE model compared to that in the experiment are 6.9% and 9.6%, respectively. The results in the experiment show that the progressive damage of laminate causes the damping of transverse bending stiffness of the T-joint. The T-joint begins to fail when the force reaches 2047 N. The failure results include matrix cracking, matrix/fiber deboning of transverse fibers, delimitation and fiber breakage leading to transverse rupture.

Keywords: thermoplastic CFRP; single hat-shaped T-joint; mechanical behavior; analytical model; finite element analysis; bending-torsion coupling

作者：许现哲等，大连理工大学，工业装备结构分析国家重点试验室运载工程与力学学部，汽车工程学院，大连

通讯作者：侯文彬，大连理工大学，工业装备结构分析国家重点试验室运载工程与力学学部，汽车工程学院，大连

全文详见中国知网学术期刊优先数字出版。