STRAIN-RATE AND INERTIA EFFECTS IN THE COLLAPSE OF 2 TYPES OF ENERGY-ABSORBING STRUCTURE
STRAIN-RATE AND INERTIA EFFECTS IN THE COLLAPSE OF 2 TYPES OF ENERGY-ABSORBING STRUCTURE
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DOI：
10.1016/0020-7403(84)90021-3
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发表时间：
1984-01-01
影响因子：
7.3
通讯作者：
ENGLISH, RW
中科院分区：
文献类型：
--
作者：
CALLADINE, CR;ENGLISH, RW
吸能结构的动态塑性倒塌比相应的准静态倒塌更难理解，这是由于两种效应，它们分别可以被描述为“应变率因子”和“惯性因子”。第一个是材料特性，由此屈服应力升高，而第二个可以影响倒塌模式等。最近发现[6，7]，在初始“峰值”后荷载-挠度曲线福尔斯急剧下降的结构比荷载-挠度曲线“平顶”的结构更“速度敏感”。（图1a）;也就是说，当移动质量传递给一定量的能量时，最终偏转更强烈地取决于撞击速度。在本文中，我们调查的应变率和惯性效应在这两种类型的结构通过一些简单的实验进行的“落锤”试验机，连同一些简单的分析，使我们能够给一个满意的帐户的实验观察。这项工作的动机部分是由于在能量吸收结构的小尺度模型测试中出现的困难，因为“应变率”和“惯性”因素不仅在一般情况下比例不同，而且对两种不同类型的结构的影响也不同。
The dynamic plastic collapse of energy-absorbing structures is more difficult to understand than the corresponding quasi-static collapse, on account of two effects which may be described as the “strain-rate factor” and the “inertia factor” respectively. The first of these is a material property whereby the yield stress is raised, while the second can affect the collapse mode, etc. It has recently been discovered [6,7]that structures whose load-deflection curve falls sharply after an initial “peak” are much more “velocity sensitive” than structures whose load-deflection curve is “flat-topped” (Fig. 1a); that is, when a given amount of energy is delivered by a moving mass, the final deflection depends more strongly on the impact velocity. In this paper we investigate strain-rate and inertia effects in these two types of structure by means of some simple experiments performed in a “drop hammer” testing machine, together with some simple analysis which enables us to give a satisfactory account of the experimental observations. The work is motivated partly by difficulties which occur in small-scale model testing of energy-absorbing structures, on account of the fact that the “strain-rate” and “inertia” factors not only scale differently in general, but also affect the two distinct types of structure differently.