ABSTRACT

This paper aims to evaluate the dynamic response and failure mechanism of corrugated core composite metal sandwich structures under the complicated fluid-structure interaction. Firstly, a reliable numerical model is established in ABAQUS/Explicit using Coupled Eulerian-Lagrangian (CEL) method. Subsequently, the influence of slamming velocity and aluminum core direction on dynamic response is studied in virtue of hydrodynamic force, deflection, transient pressure and microstrain. Finally, the damage modes and failure mechanism are studied by the ultimate damage modes exploration and progressive damage analysis. Results illustrate that hydrodynamic force experiences a sudden ascending stage before reaching the peak value, which is sensitive to the variation of local deadrise angle near the chine. Severe core skin debonding and aluminum core buckling near the chine are both alleviated under 10 m/s compared with that under 8 m/s for transverse core sandwich structures, accompanied with dominating matrix tension damage face sheet.

摘要

本文旨在评估波纹芯材复合金属夹层结构在复杂流固耦合作用下的动力响应及失效机理。首先，在ABAQUS/Explicit中使用耦合欧拉-拉格朗日（CEL）方法建立了一个可靠的数值模型。随后，利用流体动力、挠度、瞬态压力和微应变研究了撞击速度和铝芯方向对动力响应的影响。最后，通过极限损伤模式探索和渐进式损伤分析，对损伤模式和失效机理进行了研究。结果表明，水动力在达到峰值之前经历了一个突然上升的阶段，该阶段对脊附近局部斜升角的变化很敏感。