纤维增强复合材料螺旋弹簧刚度预测模型

A general form of stiffness prediction model was built for fiber reinforced plastic coil spring, and a finite element modeling method was presented for finite element without considering the mesh or node number. Based on the theory of composite laminates, the equivalent shear modulus of laminates was derived and used to establish a stiffness prediction model for fiber reinforced plastic coil spring, being applicable for arbitrary ply angle. In order to avoid the difficulties in coordinating the direction between the element coordinate systems and spring helix, a novel finite element modeling method was presented to design the laminating directly without considering the mesh. The comparison between stiffness prediction model and the experiment result in reference shows that the accuracy of the prediction model is better than the prediction model in the reference. Considering the various combination of composite material and ply angle, a comparative analysis between the prediction model and the finite element model was conducted. The results show that the error between the prediction results and the FEA results are small, which indicate the effectiveness of the proposed model.