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A practical note for SHPB test with new algorithms for delimiting pulses

机译：使用新的定界脉冲算法进行SHPB测试的实用说明

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Data processing in split Hopkinson pressure bar technique is known to be sensitive to limits and durations of the incident, reflected and transmitted strain pulses. The dynamic stress-strain curves were found to be affected by dispersion and shifting of elastic strain pulses traveling the elastic bars. In this study, a practical note was given for split Hopkinson pressure bar test with describing new iterative algorithms that we developed for delimiting SHPB strain pulses. The developed algorithms were validated through typical in-plane dynamic compressive loading tests on [+/- 55 degrees](20) E-Glass/Epoxy aged laminates tested in the range of 560-1025 s(-1). Representative stress-strain curves were reported in this paper. The strain rate was found to be linearly pressure dependent. The dynamic modulus was found to be strain rate dependent however there was a threshold effect for the ultimate strength and strain at ultimate strength. Failure mechanisms were characterized through optical and scanning microscopy. Data for dynamic properties were fitted in empirical models. (C) 2015 Elsevier Ltd. All rights reserved.
机译：众所周知，采用霍普金森分裂压力棒技术进行数据处理对入射，反射和透射应变脉冲的极限和持续时间很敏感。发现动态应力-应变曲线受到传播通过弹性棒的弹性应变脉冲的分散和移动的影响。在这项研究中，为拆分霍普金森压力棒测试提供了实用笔记，其中描述了我们为定界SHPB应变脉冲而开发的新迭代算法。通过对[+/- 55度]（20）电子玻璃/环氧树脂老化层压板进行560-1025 s（-1）范围内的典型平面内动态压缩载荷测试，验证了开发的算法。报告了代表性的应力-应变曲线。发现应变率与线性压力有关。发现动态模量取决于应变速率，但是极限强度和极限强度下的应变存在阈值效应。通过光学和扫描显微镜表征失效机理。动态特性的数据拟合在经验模型中。 （C）2015 Elsevier Ltd.保留所有权利。

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