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THERMAL STRESS ANALYSIS BY REFINED MULTILAYERED COMPOSITE SHELL THEORIES

机译:精细多层复合壳理论的热应力分析

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This paper considers the thermal stress uncoupled problem of multilayered composite shells. An assumed linear distribution of temperature through the thickness is considered for thicklthin cylindrical and spherical shells including carbon fiber reinforced layers andlor a central soft core. The Can-era's Unified Formulation (CUF) and the Principle of Virtual Displacements (PVD) are extended to derive differential governing equations for the thermal analysis of shells with constant radii of curvature. Classical and refined two-dimensional models are treated in a unified form. Both Equivalent Single Layer (ESL) and Layer-Wise (LW) approaches are considered along with variable order of expansion in the thickness direction, from linear to fourth order. In the case of ESL, the typical zig-zag form of the displacement is accounted for via the Murakami's function. Classical models have also been considered for comparison purposes. The obtained results demonstrate the effectiveness of refined models for a correct evaluation of displacements and stress field in laminated shells.
机译:本文考虑了多层复合材料壳的热应力解耦问题。对于包括碳纤维增强层和/或中心软核的厚壳圆柱壳和球形壳,考虑了厚度范围内温度的线性分布。扩展了Canera时代的统一公式(CUF)和虚拟位移原理(PVD),以导出微分控制方程,用于对曲率半径恒定的壳体进行热分析。古典和精致的二维模型以统一的形式处理。等效单层(ESL)方法和层明智(LW)方法都在厚度方向上从线性扩展到第四级,并且具有可变的扩展顺序。对于ESL,位移的典型之字形是通过村上函数来解决的。出于比较目的,还考虑了古典模型。获得的结果证明了改进模型对于正确评估叠层壳中位移和应力场的有效性。

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