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首页> 外文期刊>Journal of thermal stresses >THERMOMECHANICAL RESPONSE OF VARIABLE STIFFNESS COMPOSITE PANELS
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THERMOMECHANICAL RESPONSE OF VARIABLE STIFFNESS COMPOSITE PANELS

机译：可变刚度复合板的热力学响应

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Analysis of non-traditional Variable Stiffness (VS) laminates, obtained by steering the fiber orientation as a spatial function of location, have shown to improve buckling load carrying capacity of flat rectangular panels under axial compressive loads. In some cases the buckling load of simply supported panels doubled compared to the best conventional laminate with straight fibers. Two distinct cases of stiffness variation, one due to fiber orientation variation in the direction of the loading, and the other one perpendicular to the loading direction, were identified as possible contributors to the buckling load improvements. In the first case, the increase was attributed to the favorable distribution of the transverse in-plane stresses over the panel platform. In the second case, a higher degree of improvement was obtained due to the re-distribution of the applied in-plane loads. Experimental results, however, showed substantially higher levels of buckling load improvements compared with theoretical predictions. The additional improvement was determined to be due to residual stresses introduced during curing of the laminates. The present paper provides a simplified thermomechanical analysis of residual stress state of variable stiffness laminates. Systematic parametric analyses of both cases of fiber orientation variations show that, indeed much higher buckling loads could result from the residual stresses present in such laminates.
机译：通过将纤维取向作为位置的空间函数进行控制而获得的非传统可变刚度（VS）层压板的分析显示，可以提高轴向压力下平板矩形面板的屈曲承载能力。在某些情况下，与最佳的传统直纤维层压板相比，简单支撑的面板的屈曲载荷增加了一倍。确定了两种不同的刚度变化情况，一种是由于纤维在加载方向上的方向变化而引起的，另一种是垂直于加载方向的，这可能是导致屈曲载荷改善的原因。在第一种情况下，这种增加归因于面板平台上横向平面内应力的有利分布。在第二种情况下，由于所施加的面内载荷的重新分布，获得了更高的改进程度。但是，实验结果表明，与理论预测相比，屈曲载荷的改善程度要高得多。确定额外的改进是由于在层压板固化期间引入的残余应力。本文提供了可变刚度层压板残余应力状态的简化热力学分析。对两种纤维取向变化情况的系统参数分析表明，这种层压材料中存在的残余应力确实会导致更高的屈曲载荷。

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