Compression fatigue failure of CFRP laminates with impact damage
Compression fatigue failure of CFRP laminates with impact damage
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DOI：
10.1016/j.compscitech.2008.11.031
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发表时间：
2009-11
影响因子：
9.1
通讯作者：
N. Uda;K. Ono;K. Kunoo
中科院分区：
文献类型：
--
作者：
N. Uda;K. Ono;K. Kunoo
本研究的目的是探讨受冲击损伤的CFRP层板在压缩疲劳下的失效机理。两种复合材料，UT 500/环氧树脂和AS 4/PEEK，被用来检查的破坏行为的依赖性的材料性能，如层间韧性。UT 500/环氧树脂样本中的冲击诱导分层明显大于AS 4/PEEK样本中的分层。UT 500/Epoxy冲击损伤试样的S-N曲线与未冲击试样的S-N曲线具有相似的趋势。在疲劳测试过程中，UT 500/环氧树脂样本中的冲击诱导分层以平行的方式生长到样本后侧的自由边缘。另一方面，未受冲击的AS 4/PEEK试样的S-N曲线比受冲击损伤的试样的S-N曲线下降得更陡。在疲劳断裂之前，冲击AS 4/PEEK样本中的分层未到达自由边缘。
The objective of this study is to investigate failure mechanisms of impact-damaged CFRP laminates subjected to compression fatigue. Two kinds of composite materials, UT500/Epoxy and AS4/PEEK, were used to examine the dependence of failure behavior on the material properties such as interlaminar toughness. Impact-induced delaminations in the UT500/Epoxy specimen were considerably larger than those in the AS4/PEEK specimen. The S–N curves for the UT500/Epoxy specimens with impact damage exhibited a similar tendency to those without impact. The impact-induced delamination in the UT500/Epoxy specimen grew widthwise to the free edge on the rear side of the specimen during the fatigue test. On the other hand, the AS4/PEEK specimens without impact exhibited a more steeply declining S–N curve than those with impact damage. The delaminations in the impacted AS4/PEEK specimen did not reach the free edge before the fatigue fracture.