双金属复合板的拉伸回弹特性研究

Study on springback property of bimetal composite plate under tensile loading

以弹塑性力学理论为基础,对双金属复合板在平面应力状态下的拉伸回弹过程进行解析,得出回弹残余曲率及残余应变中性轴偏移量的解析方程,继而结合有限元仿真和试验分析钢-铝复合板的拉伸回弹变形行为。研究表明,复合板拉伸回弹后呈现纯弯曲状态,残余曲率随着载荷的增大而增大,对于任意材料的双金属复合板均存在一个复合配比值,在该值下拉伸回弹产生的残余曲率最大。

Based on the elastic-plastic mechanics,the springback characteristics of bimetal composite plate were analyzed under the plane stress condition,and the analytical equations of residual curvature and neutral axis offset of residual strain were obtained. By combining the FEM method and experiments,the steel-aluminum bimetal composite was analyzed specifically. The results show that the bimetal composite plate after springback exhibits a pure bending state and the residual curvature will increase with the increase of load. There exists a stable mixture ratio value,which results in the maximal residual curvature for any materials of layers.