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本文对用16层纤维增强材料对称铺设成的试样,在轴向载荷和热载下的应力分布作了计算。虽然沿轴向应力假定为常数,但在体积元素中必需包括层间剪应力和剥离应力。然而,系统矩阵的自由度数和带宽能保持比较低。计算结果表明,在铺层分界面上有十分明显的应力峰,並发现,即使沿铺层厚度使用16个二次元素,这些值仍没有达到令人满意的精度。由于这样的收敛性能,推测在这些点可能发生无限大的应力。本文应用子结构方法分析了少量具有不同铺设顺序的例子。比较这些分析结果,得到了一种产生小边缘应力的铺设顺序。
In this paper, we calculate the stress distribution under the axial load and the thermal load by symmetrically laying 16 layers of fiber reinforced materials. Although axial stress is assumed to be constant, it is necessary to include interlaminar shear stress and peel stress among the volume elements. However, the degree of freedom and the bandwidth of the system matrix can be kept relatively low. The results show that there is a very significant stress peak at the interface of the plies and it is found that these values do not reach a satisfactory accuracy even with 16 secondary elements along the ply thickness. Due to such convergence, it is assumed that infinite stress may occur at these points. In this paper, a few examples of different laying orders are analyzed using the substructure method. Comparing the results of these analyzes, we obtained a laying order that produced a small edge stress.