Abstract

In crash event, aerospace structures are designed to collapse progressively, dissipating high kinetic energy and protecting the passengers against abrupt decelerations. To achieve this goal, a better comprehension of crash failure mechanisms is necessary to improve traditional crash structures by designing and optimizing new energy absorbers. In this paper, the elementary failure mechanisms involved in crushing of open section coupons are investigated; damage initiation and evolution, and absorbed energy of plain weave fabric CFRP Hat-Shape cross section specimens have been studied under quasi-static crushing load. Numerical simulations have been performed by using twelve layers of stacked-shell models with two heights (100-150mm) and two triggers (steeple, chamfer45°), Abq_Ply_Fabric material model embedded in Abaqus/Explicit results was used and compared against experimental data. and good agreement has been found. As results, Coupons with 100mm height and chamfer45° trigger dissipates more energy than coupons with 150mm height and steeple trigger.

摘要

在碰撞事件中，航空航天结构被设计成逐渐倒塌，消散高动能并保护乘客免受突然减速。为了实现这一目标，有必要更好地理解碰撞失效机制，通过设计和优化新的能量吸收器来改进传统的碰撞结构。本文研究了开口截面试样破碎的基本失效机制；研究了准静态压碎载荷下平纹织物CFRP帽形截面试样的损伤萌生演化和吸收能量。通过使用具有两个高度（100-150mm）和两个触发器（尖顶，倒角45°）的十二层堆叠壳模型进行了数值模拟，使用嵌入在 Abaqus/Explicit 结果中的 Abq_Ply_Fabric 材料模型并与实验数据进行比较。并找到了很好的协议。因此，100mm 高和 45° 倒角扳机的试片比 150 毫米高和尖顶扳机的试片消耗更多的能量。