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首页> 外文会议>SEM IX International Congress on Experimental Mechanics June 5-8, 2000 Orlando, Florida >Failure Mechanisms of Unidirectional Composites under Dynamic Loading
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Failure Mechanisms of Unidirectional Composites under Dynamic Loading

机译：动态载荷作用下单向复合材料的破坏机理

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摘要

Dynamic deformation and damage mechanisms of a unidirectional AS4/PEEK composite were investigated by using an improved Split Hopkinson Pressure Bar (SHPB) apparatus based on Nemat-Nasser's dynamic recovery apparatus. In this study, a gap, equal to the input bar movement produced by the input pulse, was carefully set between the transfer flange and tube. This makes the subsequent compressive pulses completely trapped in the tube and mass. Thus, only a single controlled compressive pulse is applied to the specimen during the entire test, which makes it possible to perform dynamic loading-unloading tests. The strain signal directly obtained from the specimen showed that the specimen is subjected to a single compressive pulse. Specimens were dynamically unloaded from different strain levels by controlling the amplitude and duration of the input pulse. The dynamic stress-strain curves at different loading strains were obtained and the recovered specimens were observed by optical microscopy in order to examine damage mechanisms, features and damage processes at different levels of loading. The final failure was found to be end crushing and splitting when no end constraints were present, and fiber kinking when end constraints were present.
机译：利用基于Nemat-Nasser动态恢复装置的改进的分裂霍普金森压力棒（SHPB）装置，研究了单向AS4 / PEEK复合材料的动态变形和损伤机理。在这项研究中，在传输法兰和管之间仔细设置了一个间隙，该间隙等于输入脉冲由输入脉冲产生的运动。这使得随后的压缩脉冲完全滞留在管子和质量中。因此，在整个测试过程中，仅对样品施加了一个受控的压缩脉冲，这使得可以执行动态加载/卸载测试。直接从样本获得的应变信号表明样本受到了单个压缩脉冲。通过控制输入脉冲的幅度和持续时间，可以从不同的应变水平动态卸载样品。获得了不同载荷应变下的动态应力-应变曲线，并通过光学显微镜观察了回收的试样，以研究不同载荷水平下的损伤机理，特征和损伤过程。当没有末端约束时，发现最终的失败是末端压碎和分裂，而当存在末端约束时，则是纤维扭结。

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