Ballistic impact to access the high-rate behaviour of individual silk fibres
Ballistic impact to access the high-rate behaviour of individual silk fibres
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DOI：
10.1016/j.jmps.2012.06.007
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发表时间：
2012-10-01
影响因子：
5.3
通讯作者：
Siviour, Clive R.
中科院分区：
文献类型：
--
作者：
Drodge, Daniel R.;Mortimer, Beth;Siviour, Clive R.
本文提出了一种经典的横向纤维冲击技术的修正方法，并应用于获得商业桑蚕丝高应变率本构行为的问题。还研究了中强尼龙。提出了两种方法：首先是一个固定的预应力，改变冲击速度的方法，推导出应力-应变行为的逆拟合;其次是一个固定的冲击速度，改变预应力的方法，假设基本的弹性跳跃条件，以获得轨迹的冲击后状态。使用这两种方法获得的冲击后应力应变状态收敛丝绸，但发散尼龙。我们将此归因于丝的精细结构能够在静态和动态变形速率下均匀化能量耗散。然而，尼龙的粗糙微观结构导致不同的加载路径依赖性，从而在两种方法中产生分歧。还注意到，与尼龙相比，丝在不同的预应力下表现出相对稳定的冲击能量吸收水平。(C)2012爱思唯尔有限公司保留所有权利。
A revision of a classic transverse fibre impact technique is presented, as applied to the problem of obtaining the high strain-rate constitutive behaviour of commercial Bombyx mori silk. Medium tenacity nylon was also studied. Two approaches are presented: firstly a fixed pre-stress, varied impact velocity method that derives stress-strain behaviour by inverse fit; and secondly a fixed impact velocity, varied pre-stress approach, assuming basic elastic jump conditions to obtain a locus of post-impact states. The post-impact stress strain states obtained using the two approaches converge for silk but diverge for nylon. This we attribute to silk's fine structure being able to homogenise energy dissipation at static and dynamic deformation rates. However, the coarser microstructure of nylon results in a different loading path dependence, thus divergence in the two approaches. It was also noted that silk exhibited a comparatively stable level of impact energy absorption under varying pre-stress, when compared to nylon. (C) 2012 Elsevier Ltd. All rights reserved.