Experimental investigation of the strain‐rate effects on the failure of composite materials with off‐axis tensile tests on unidirectional plies

IF 1.8 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strain Pub Date : 2021-04-20 DOI:10.1111/str.12385

T. Fourest, J. Berthe

引用次数: 1

Abstract

The present study experimentally investigates the mechanical response of T700/M21 Carbon Fibre Reinforced Polymers subjected to coupled shear and transverse tension at intermediate strain rates ranging from 10−3 to 15 s−1. Off‐axis tension specimens with transverse and oblique tabs are used for the various tests. Moreover, the specimen aspect ratio is quite low, since dynamic tests are performed in this study. The axial stress–strain curves are successfully simulated using finite element simulations with a viscoelastic model. Based on these numerical simulations, specific stress correction factors are computed to take the effect of end constraints into account for such low aspect ratio specimens. Finally, an increase in the material strength with the strain rate is observed.

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单向层离轴拉伸试验研究应变率对复合材料破坏的影响

本研究通过实验研究了T700/M21碳纤维增强聚合物在10−3至15的中间应变速率下受到耦合剪切和横向张力的机械响应 s−1。各种试验均采用带横向和斜向翼片的离轴拉伸试样。此外，由于本研究中进行了动态试验，因此试样的长宽比非常低。使用粘弹性模型的有限元模拟成功地模拟了轴向应力-应变曲线。基于这些数值模拟，计算了特定的应力修正系数，以将端部约束的影响考虑到这种低纵横比试样。最后，观察到材料强度随着应变速率的增加而增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Strain 工程技术-材料科学：表征与测试

CiteScore

4.10

自引率

4.80%

发文量

期刊介绍： Strain is an international journal that contains contributions from leading-edge research on the measurement of the mechanical behaviour of structures and systems. Strain only accepts contributions with sufficient novelty in the design, implementation, and/or validation of experimental methodologies to characterize materials, structures, and systems; i.e. contributions that are limited to the application of established methodologies are outside of the scope of the journal. The journal includes papers from all engineering disciplines that deal with material behaviour and degradation under load, structural design and measurement techniques. Although the thrust of the journal is experimental, numerical simulations and validation are included in the coverage. Strain welcomes papers that deal with novel work in the following areas: experimental techniques non-destructive evaluation techniques numerical analysis, simulation and validation residual stress measurement techniques design of composite structures and components impact behaviour of materials and structures signal and image processing transducer and sensor design structural health monitoring biomechanics extreme environment micro- and nano-scale testing method.