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An empirical strain rate-dependent constitutive relationship for glass-fibre reinforced epoxy and pure epoxy

机译：玻璃纤维增​​强环氧树脂和纯环氧树脂的经验应变率相关本构关系

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摘要

An investigation into the effect of strain rate on glass-fibre reinforced plastic (GFRP) and pure epoxy subjected to compressive loading has been conducted. Experimental results in this study were obtained by a hydraulically driven Instron Testing machine and a Split-Hopkinson Pressure Bar. The range of strain rates explored was between 5 x 10~(-4)/s and 2500/s. A comparison between the behaviour of pure epoxy and GFRP reveals that both are strain rate sensitive, especially in the low strain rate regime. There is also a significant increase in the dynamic modulus as strain rate increases. It is shown that the stress-strain response under dynamic loading is not only a function of strain rate, but also of the strain state. An empirical equation incorporating both strain and strain rate terms is proposed and is found to adequately describe the stress-strain behaviour of both GFRP and pure epoxy for the range of loading rates studied.
机译：已经研究了应变速率对玻璃纤维增​​强塑料（GFRP）和承受压缩载荷的纯环氧树脂的影响。这项研究的实验结果是通过液压驱动的Instron测试机和Split-Hopkinson压力棒获得的。探索的应变率范围在5 x 10〜（-4）/ s和2500 / s之间。纯环氧树脂和GFRP的性能比较表明，两者都是应变速率敏感的，特别是在低应变速率状态下。随着应变速率的增加，动态模量也显着增加。结果表明，动态载荷作用下的应力应变响应不仅是应变率的函数，而且还是应变状态的函数。提出了同时包含应变和应变率项的经验方程，发现该方程足以描述所研究的加载速率范围内GFRP和纯环氧树脂的应力-应变行为。

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  • 来源
    《Composite Structures》 |1995年第4期|p.201-210|共10页
  • 作者

    T. E. Tay; H. G. Ang; V. P. W. Shim;

  • 作者单位

    Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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