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Influence of post-buckling behaviour of composite stiffened panels on the damage criticality

机译：复合材料加劲板屈曲后行为对损伤临界点的影响

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摘要

In stiffened panels with defects, such as skin delaminations or stringer debonding, buckling may occur prior to the designed critical buckling load. Depending on the damage parameters, such defects may also affect the post-buckling behaviour and consequently the structural performance. An automated finite element (FE) modelling tool has been developed to predict the post-buckling behaviour of panels. It was coupled with a linear elastic fracture mechanics approach to determine damage criticality, based on the "no-growth" principle. The structural behaviour in the post-buckling range and its interaction with the damage parameters were analysed. Local buckling occurred as a result of localised stiffness reduction in the damage region. Global buckling occurred when sufficient in-plane strain was reached. The onset of local buckling was an important factor on stringer debonding criticality as the local buckling mode had an effect on the corresponding global buckling. In comparison, the onset of local buckling for the skin delamination was lower due to the thin sub-laminate separation. However, it was less influential on the damage criticality because the local buckling slowly dissipated in the far post-buckling range. It was found that the initiation of local buckling, and the interaction between the local and global buckling mode, would determine the damage criticality.
机译：在具有缺陷（例如皮肤分层或桁条剥离）的刚性面板中，可能会在设计的临界屈曲载荷之前发生屈曲。根据损坏参数，此类缺陷也可能会影响屈曲后的行为，进而影响结构性能。已经开发出一种自动有限元（FE）建模工具来预测面板的屈曲后行为。它基于“无增长”原理，结合线性弹性断裂力学方法来确定损伤临界值。分析了屈曲后范围内的结构行为及其与损伤参数的相互作用。局部屈曲是由于损伤区域中局部刚度降低而导致的。当达到足够的平面应变时，就会发生整体屈曲。局部屈曲的发生是纵梁脱胶临界度的重要因素，因为局部屈曲模式会影响相应的整体屈曲。相比之下，由于亚层板分离薄，导致皮肤分层的局部屈曲发生率较低。但是，它对损伤临界值的影响较小，因为局部屈曲在屈曲后的较远范围内逐渐消失。研究发现，局部屈曲的开始以及局部屈曲和整体屈曲模式之间的相互作用将决定损伤的临界程度。

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