Optimised design of nested circular tube energy absorbers under lateral impact loading
Optimised design of nested circular tube energy absorbers under lateral impact loading
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DOI：
10.1016/j.ijmecsci.2007.04.005
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发表时间：
2008
影响因子：
7.3
通讯作者：
A. Olabi;Edmund Morris;M. Hashmi;M. Gilchrist
中科院分区：
文献类型：
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作者：
A. Olabi;Edmund Morris;M. Hashmi;M. Gilchrist
低碳钢(DIN 2393)嵌套管的布置被动态加载横向压碎。试验是在冲击速度为3到5m/S之间进行的，使用固定质量在重力影响下撞击试件。考虑了两种嵌套式管道系统的布置；一种是标准设计，一种是优化设计。用显式程序LS-DYNA对它们的破碎行为和能量吸收能力进行了实验分析和数值模拟。将数值分析结果与实验结果进行了比较。通过数值计算，得到了力-挠度响应的超前预测值。有人试图根据考珀-西蒙兹关系中使用的应变率参数的有效性来解释这种不一致。结果表明，优化后的吸能器比标准布置表现出更理想的力-挠度响应，这是由于采用了软钢圆柱形阻尼器的简单设计改进。
Arrangements of mild steel (DIN 2393) nested tubes were laterally crushed by dynamic loading. The tests were performed with impact velocities ranging between 3 and 5m/s, using a fixed mass impinging onto the specimens under the influence of gravity. Two arrangements of nested tube systems were considered; one standard and one optimised design. Their crushing behaviour and energy absorption capabilities were analysed experimentally and simulated numerically using the explicit code LS-DYNA. Results from the numerical analyses were compared to those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the validity of strain rate parameters used in the Cowper–Symonds relation. It was shown that the optimised energy absorber exhibited a more desirable force–deflection response than the standard arrangement due to a simple design modification that involved mild steel cylindrical dampers.