Validity of the Reduced Bending Stiffness Method for Stacked Laminates
Validity of the Reduced Bending Stiffness Method for Stacked Laminates
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DOI：
10.1007/978-3-030-47491-1_21
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发表时间：
2020
期刊：
影响因子：
2.7
通讯作者：
J. Schilling;C. Mittelstedt
中科院分区：
文献类型：
--
作者：
J. Schilling;C. Mittelstedt
在复合材料的实际应用中，不对称层合板是不可避免的。机身外部需要光滑的表面，通常只能通过在内部安装加强件来加固。此处，纵梁脚通常堆叠在蒙皮表面的顶部。在这些情况下，应用降低弯曲刚度 (RBS) 方法来避免使用更复杂的计算方法来近似临界屈曲载荷。然而，RBS 方法的有效性尚未针对堆叠层压板进行评估，而仅针对单个不对称层压板进行评估。在本工作中，通过研究在单轴压缩下由两个对称的交叉层压板组成的堆叠层压板来解决该主题。该面板仅受支撑。忽略预屈曲变形的影响。结果与所调查的特殊情况完全一致；因此，建议使用折减弯曲刚度方法。
Unsymmetrical laminates are unavoidable in practical applications of composite materials. Fuselages require a smooth surface on the outside and can be typically only stiffened by attaching reinforcements on the inside. Here, the stringer feet are often stacked on top of the skin surface. In those cases, the reduced bending stiffness (RBS) method has been applied to avoid more complex computational methods for the approximation of critical buckling loads. However, the validity of the RBS method has not been evaluated for stacked laminates but for single unsymmetrical laminates only. This topic is addressed in the present work by investigating a stacked laminate consisting of two by itself symmetrical cross-ply laminates under uniaxial compression. The panel is simply supported. The effects of prebuckling deformation are neglected. The results show perfect agreement for the special case investigated; thus, the utilisation of the reduced bending stiffness method can be recommended.