线弹性基材和双主轴线性应变硬化塑性基材圆孔六角形蜂窝的面内动力学

IF 1.1 Q3 ENGINEERING, CIVIL
D. Sun, Yu-jin Sun, Yali Xu, Haotian Luo, Lu Chang, Qian Du, Guozhi Li
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引用次数: 0

摘要

在1 ~ 250 m/s两主轴破碎速度下,采用线弹性基材和线性应变硬化基材对圆单元六角形包装蜂窝进行了面内变形模式、应力-应变曲线和能量吸收特性的数值研究。观察到三种变形模式:准静态均匀模式、过渡模式和动态模式。给出了变形模态过渡临界速度的经验公式。随着破碎速度的增加,应力-应变曲线的高原应力阶段应力波动更加剧烈,在低破碎速度下,在x2方向上可以看到这种波动,而在低甚至中等破碎速度下,在x1方向上不出现这种波动。在一定的破碎速度下,致密化应变与t/R比呈线性关系,在一定t/R比的变形模式下,致密化应变随破碎速度的增加呈近似线性关系。高原平均应力的变化规律与一维激波模型一致,高原静态应力与相对密度的平方成正比。在有限元结果的基础上,给出了三种平台平均应力的经验表达式。破碎力效率与t/R比无关,对破碎速度敏感。在准静态均匀模式下,破碎力效率基本恒定,在过渡模式下,随着速度的增加,破碎力效率逐渐减小,在动态模式下,破碎力效率在一个水平附近上下波动,与应力-应变曲线的形状相对应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In-plane dynamics of circular cell hexagonally packaged honeycombs with linear elastic and plastic base material with linear strain hardening in two principal axes
The in-plane deformation modes, stress–strain curves and energy absorption characteristics of circular cell hexagonally packaged honeycombs with the linear elastic and plastic base material with linear strain hardening are numerically investigated under crushing velocities 1–250 m/s in two principal axes. Three deformation modes are observed, quasi-static homogeneous mode, transition mode, and dynamic mode. The empirical formulas of critical velocities of deformation mode transition are given. With increasing crushing velocities, the fluctuation of stress becomes more violent in the plateau stress phase of stress–strain curve, which can be seen at low crushing velocities in x2 direction, but doesn't appear in x1 direction at low and even moderate crushing velocities. The densification strain is linear with the t/R ratio for a given crushing velocity, and becomes larger with the increasing velocities approximately in linear relationship under a deformation mode for a given t/R ratio. The law of mean plateau stress is consistent with the one-dimensional shock wave model and the static plateau stress is proportional to the square of relative density. Based on finite element results, three types of empirical expressions of mean plateau stress are given. Crushing force efficiency is approximately independent of t/R ratio and sensitive to the crushing velocity. The crushing force efficiency is nearly constant under quasi-static homogeneous mode, becomes smaller with increasing velocities under transition mode, and then drops and fluctuates up and down around a level under dynamic mode, which corresponds to the shapes of stress–strain curves.
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CiteScore
2.60
自引率
0.00%
发文量
8
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