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Effect of Damage on the Energy Absorption of Prismatic Thin-Wailed Polymer Composite Structures

机译：损伤对棱柱型薄壁聚合物复合结构能量吸收的影响

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摘要

This paper investigates the effect of three types of simulated damage on the specific energy absorption (SEA) under axial crushing of square section E-glass/polyester composite tubes. Damage was simulated by through-drilled holes of various sizes, by delaminations of different sizes and by zones of out-of-plane impact damage created using a hemispherical tup driven at different energy levels. Also, in order to increase tolerance to out-of-plane impact damage, a thermoplastic interleaf was moulded into a number of samples. Tube samples were crushed axially at quasi-static (5mm/min) and impact (5ms~(-1)) rates. SEA was seen to be strongly influenced by loading rate and significant reductions in SEA were seen as rate increased. Below a certain threshold damage level (or size) there was no effect on the SEA. Above this threshold, the damage triggered unstable failure - leading to greatly reduced energy absorption capability. The threshold level was seen to be dependent on damage type, damage level and test rate and a significant improvement in damage tolerance was seen as the loading rate increased. The SEA for thermoplastic interleaf samples was reduced, but became independent of rate.
机译：本文研究了三种模拟损伤对方形截面E-玻璃/聚酯复合管轴向破碎下比能量吸收（SEA）的影响。通过使用各种尺寸的通孔，不同尺寸的分层以及使用以不同能级驱动的半球形轮胎产生的平面外冲击损坏区域来模拟损坏。另外，为了增加对面外冲击损伤的耐受性，将热塑性内衬模制成许多样品。将试管样品以准静态（5mm / min）和冲击（5ms〜（-1））速率轴向压碎。 SEA被认为受加载速率的强烈影响，并且随着速率的增加，SEA的显着减少被认为是。低于特定阈值损害水平（或大小），对SEA没有影响。超过此阈值，损坏会引发不稳定故障-导致能量吸收能力大大降低。阈值水平被认为取决于损伤类型，损伤水平和测试速率，并且随着载荷速率的增加，损伤耐受性得到了显着改善。热塑性插页样品的SEA减少了，但与速率无关。

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