Dynamic Response with Strain Rate Dependence of Composite Laminates

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Dynamic Response with Strain Rate Dependence of Composite Laminates

更新时间：2025-05-08

- Dynamic Response with Strain Rate Dependence of Composite Laminates
- Vol. 43, Issue 1, Pages: 72-76(2009)
- 作者机构：
  
  西安交通大学土木工程系,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB332
- Online First：10 January 2009，
  
  Published：2009
- 稿件说明：
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Dynamic Response with Strain Rate Dependence of Composite Laminates[J]. 2009, 43(1): 72-76.
DOI：

Dynamic Response with Strain Rate Dependence of Composite Laminates[J]. 2009, 43(1): 72-76. DOI：

摘要

基于对分离式霍普金斯拉杆试验结果的分析

建立了T300/epoxy复合材料考虑应变率效应的黏弹性本构模型

并将该模型引入有限元分析软件LS-DYNA

对T300/epoxy复合材料层合板进行了冲击动态响应模拟计算

计算结果与试验结果吻合较好

验证了模型的有效性.从层合板抗冲击性能的角度提出了有效冲击时间的概念

探讨了考虑应变率效应时复合材料层合板在高速冲击有效时间内的应力(应变)分布、挠度随冲击速度的变化等动态响应规律.分析发现:最大正应变和层间剪应力沿层合板边长方向的衰减先快后慢

衰减速度明显变小的范围大约在距弹着点20 mm附近; 在相同冲击速度条件下

层合板的挠度随到冲击点距离的增大而减小

在2个垂直方向上挠度分布规律基本相同

层合板表现出整体变形的对称性; 存在冲击影响域

在一定范围(10 mm)之外

冲击速度高时层合板的挠度反而小

冲击影响域也小.

Abstract

A viscoelastic constitutive model considering the strain rate effect of T300/epoxy composite laminates was established based on the analysis of high velocity impact experiment results. Then the model was integrated into LS-DYNA to carry out dynamic response simulation of T300/epoxy laminates subjected to impact. The results of simulation coincide with the experimental data well. The concept of effective time was proposed from the point of impact-resistance ability of laminates. Considering the high strain rate effect

the dynamic response characteristics of T300/epoxy laminates such as distribution of maximum stress(strain)at different location of the plate during the effective time and the variation of deflection with impact velocities were investigated. It is found that the decaying of maximum strain and maximum shear stress tends to be fast at first and then become slow along the direction of laminates length. The changing location of decaying rate is about 20 mm from the impact point. The deflections of the laminates decrease with the distances far from the impact point under the same impact velocity. The distribution of deflections is similar in two perpendicular directions of the laminates to show a symmetrical deformation in the whole view. The affecting area can be observed

and the deflections are smaller beyond a certain distance(10 mm)under higher impact velocities than those under lower impact velocities due to the difference of impact affecting area.

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references

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