The fatigue damage of composite sandwich panels is divided into two parts: the face sheet damage and the core damage. Both the two kinds of damage cause the performance degradation of panels, however only the core damage results in the ultimate failure. In this paper, a fatigue damage model of the face sheet and the core is proposed and three-point bending tests are carried out to obtain the deflection evolution curves. With the proposed model, the fatigue damage can be predicted accurately, which proves the validity of the fatigue damage model proposed in this paper.

中文翻译：

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三点弯曲载荷作用下复合蜂窝夹芯板的多区域疲劳损伤模型

复合夹芯板的疲劳损伤分为两部分：面板损伤和芯部损伤。两种损坏都会导致面板性能下降，但是只有核心损坏会导致最终故障。提出了面板和型芯的疲劳损伤模型，并进行了三点弯曲试验，获得了挠度演化曲线。利用该模型可以对疲劳损伤模型进行准确预测，证明了本文提出的疲劳损伤模型的有效性。