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针对复合材料层合结构的热和力学分析提出了一种多层相对自由度壳元。整个分析过程可以在同一套有限元网格下实现。该单元基于三维有限元提出,易于与三维实体单元连接。采用了一种应力后处理方法以准确计算复合材料旋转壳体中的横向应力。两个数值算例说明了程序的可靠性。分析了受热载荷作用的带开孔和补强的复合材料圆柱壳,结果显示当补强层与面板的热膨胀系数相差过大时,孔边会存在较大的层间应力,可能会导致分层破坏。
A multi-layer shell with relative degrees of freedom is proposed for the thermal and mechanical analysis of composite laminates. The whole analysis process can be realized under the same finite element grid. The unit is based on three-dimensional finite element proposed, easy to connect with the three-dimensional solid unit. A post-stressing method is used to accurately calculate the transverse stresses in the composite rotating shell. Two numerical examples illustrate the reliability of the program. The results show that when the thermal expansion coefficient between the reinforcement and the panel is different by a large margin, there will be large interlaminar stress on the edge of the hole, which may result in delamination damage.