剪滞效应对复合材料固化变形影响的数值分析

通过分析固化过程中热、化学收缩及材料性能之间的多场耦合，建立了复合材料固化变形的三维数值仿真模型。预测结果与试验结果的对比，证明了所建模型具有较高的计算精度。基于所建模型，研究了剪滞效应的机理及影响，结果表明：剪滞效应随着构件厚度的增大而增强，但构件转角半径对剪滞效应的影响很小；剪滞效应是影响构件固化变形的一个重要因素，构件固化变形随着剪滞效应的增强而减小。

Numerical Analysis of Shear-lag Effect on Curing Deformation of Composites

 By analyzing the multi-field coupling of thermal, chemical shrinkage and material properties during curing, a three-dimensional numerical simulation model for curing deformation of composites was established. By comparing the predicted results with the experimental ones, it is proved that the simulation model has high computational accuracy. Based on the established simulation model, the physical mechanism and influences of the shear-lag effect were analyzed. Results show that the shear-lag effect increases with the increase of the part thickness, while the influences of the part corner radius on the shear-lag effect are insignificant. The shear-lag effect is an important factor affecting the curing deformation of parts, and the curing deformation decreases with the enhancement of shear-lag effect.