To better induce progressive collapse modes of composite corrugated plate, a novel multi-stage stacked structure is proposed. The multi-stage stacked triggering consists of stepped structures and sawtooth cutout that guides the progressive crushing load and failure mode. The different triggering configurations including non-sawtooth, partial sawtooth, overall evenly sawtooth and overall uneven sawtooth are discussed and compared. To better predict the progressive failure process, the material failure is initiated by the maximum-stress failure criterion and a stiffness degradation method. The traction-separation model is adopted to simulate inter-layer delamination failure. Under the validated model, the influences of geometrical parameters on the crushing responses are performed. Numerical simulation results show that a good agreement is exhibited between simulated and experimental results. The progressive failure behavior could be obtained by the stepped structures and sawtooth cutout. The initial loading responses highly depend on the gradient stacking methods. The initial peak load of proposed novel multi-stage stacked concepts is about 30% lower than that of traditional structure.

Research route for the multi-stage stcked trigger of composite corrugated plate

为了更好地诱导复合瓦楞板的渐进塌陷模式，提出了一种新颖的多级堆叠结构。多级堆叠触发由阶梯状结构和锯齿状切口组成，可引导逐步破碎载荷和破坏模式。讨论并比较了不同的触发配置，包括非锯齿，部分锯齿，整体均匀锯齿和整体不平坦锯齿。为了更好地预测渐进破坏过程，材料破坏是通过最大应力破坏准则和刚度降低方法来引发的。采用牵引分离模型模拟层间分层破坏。在验证的模型下，执行了几何参数对破碎响应的影响。数值模拟结果表明，模拟结果与实验结果吻合良好。渐进式破坏行为可以通过阶梯状结构和锯齿形切口获得。初始加载响应高度依赖于梯度叠加方法。所提出的新颖多级堆叠概念的初始峰值载荷比传统结构的初始峰值载荷低约30％。

复合瓦楞纸板多阶段触发的研究途径