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Effect of the electric current on the impact fatigue strength of CFRP composites

机译：电流对CFRP复合材料冲击疲劳强度的影响

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摘要

The present study intends to analyse and quantify the effect of the electric exposure on the impact fatigue strength of carbon/epoxy laminates subject to a DC electric current flowing through-thickness at the impact point. For this purpose several laminates were tested with different stacking sequences: [0](16) and [0(i), 90(i)] S, i = 2, 3, 4, 5. The samples were submitted to a DC electric current of 1 A, corresponding to an electric current density of 0.142 (A/mm(2)). The unidirectional samples were exposed over 2 h, 4 h and 8 h, and the cross-ply ones to 8 h. The tests were carried out using a drop weight-testing machine and a 10 mm diameter impactor. It was possible to conclude that the exposure to the electric current decreases the impact fatigue life, but the unidirectional laminates show to be much more sensible than the cross-ply ones as consequence of the higher pre-damages induced. Thicker samples are also minus sensible to the effects promoted by the electric current and, consequently, the impact fatigue life is less affected.
机译：本研究旨在分析和量化电暴露对碳/环氧树脂层压板的冲击疲劳强度的影响，该冲击疲劳强度受到直流电流通过厚度在冲击点流动的影响。为此，测试了几种具有不同堆叠顺序的层压板：[0]（16）和[0（i），90（i）] S，i = 2、3、4、5。将样品送交直流电1 A的电流，对应于0.142（A / mm（2））的电流密度。单向样品分别暴露2 h，4 h和8 h，交叉铺层暴露8 h。使用下落重量测试机和直径为10 mm的冲击器进行测试。可以得出结论，暴露于电流会降低冲击疲劳寿命，但由于产生了较高的预损坏，单向层压板比交叉层压板更敏感。较厚的样品对电流促进的作用也不太敏感，因此，冲击疲劳寿命受到的影响较小。

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