A failure criterion for predicting the damage of honeycomb structures under combined compression and transverse shearing is put forward in this paper. An analytical method using the Bloch wave function and von Kármán plate theory is employed to predict the onset of damage based on the fact that failure of honeycomb structures is closely related to the buckling behavior of its core. After obtaining a bunch of data points of different stress conditions where damage occurs, a failure envelop for honeycomb cores under out-of-plane loads is formed and fitted by a nonlinear function. In order to validate the proposed failure criterion, experimental studies are performed on honeycomb sandwich structures consisting of Nomex honeycomb core and CFRP (carbon-fiber reinforced plastics) facesheets including in-plane compression, three-point bending and combined-compression-shearing. The accuracy of the proposed criterion is evaluated by comparing experiments with results predicted by progressive damage model incorporating the failure envelope of honeycomb core.

提出了一种预测组合压缩和横向剪切作用下蜂窝结构破坏的失效准则。基于蜂窝结构的破坏与其核心的屈曲行为密切相关的事实，采用了一种利用Bloch波函数和vonKármán板理论的分析方法来预测破坏的开始。在获得一堆在不同应力条件下会发生损坏的数据点后，就形成了蜂窝芯在平面外载荷下的失效包络，并通过非线性函数进行拟合。为了验证所提出的失效准则，对包括Nomex蜂窝芯和CFRP（碳纤维增强塑料）面板的蜂窝夹层结构进行了实验研究，包括面内压缩，三点弯曲和组合压缩剪切。通过将实验与结合蜂窝芯破坏包络的渐进损伤模型预测的结果进行比较，来评估所提出标准的准确性。