Impact of prolonged environmental exposure on stress transfer efficiency in poly(p‐phenylene terephthalamide)/epoxy composites,Polymer Composites

当前位置： X-MOL 学术 › Polym. Compos. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Impact of prolonged environmental exposure on stress transfer efficiency in poly(p‐phenylene terephthalamide)/epoxy composites
Polymer Composites ( IF 4.8 ) Pub Date : 2021-01-11 , DOI: 10.1002/pc.25945
George Anagnostopoulos ₁ , Emmanuel N. Koukaras _{1,

2} , John Parthenios ₁ , Costas Galiotis _{1,

3}

Affiliation

The mechanical performance of fiber‐reinforced composites is seriously affected by their exposure to the environment. The combined action of elevated temperatures, humidity, and UV radiation (aging) on aramid fibers/epoxy resin composites is examined by employing Raman spectroscopy in tandem with mechanical loading. The imposed conditions drastically affect the interface of the composites altering the performance of the material under tensile loads. Although the maximum values of interfacial shear strength for the aged material are similar to that of the pristine material; however, they appear at lower strain levels, which is attributed to the significant decrease of the shear modulus of the epoxy matrix combined with the failure of aramid fibers to sustain the external loading due to the aging process. At high strains, the interface fails at lower strain levels (compared to the pristine sample) due to significant increase of micro‐cracking and micro‐voids on the surface of the aged composites. The formation of such flaws is the primary reason for the reduced mechanical performance and early failure of the composite material.

中文翻译：

长时间暴露于环境对聚对苯二甲酰对苯二酰胺/环氧复合材料的应力转移效率的影响

纤维增强复合材料的机械性能会受到暴露于环境的严重影响。高温，湿度和紫外线辐射（老化）对芳纶纤维/环氧树脂复合材料的综合作用，是通过拉曼光谱法与机械载荷一道检验的。施加的条件极大地影响了复合材料的界面，从而改变了材料在拉伸载荷下的性能。尽管时效材料的界面剪切强度的最大值与原始材料相似。然而，它们出现在较低的应变水平，这归因于环氧树脂基体的剪切模量的显着降低以及芳族聚酰胺纤维由于时效过程而无法承受外部载荷。在高压力下由于老化复合材料表面上的微裂纹和微孔显着增加，因此在较低的应变水平下（与原始样品相比），界面会失效。这种缺陷的形成是复合材料机械性能降低和早期失效的主要原因。

更新日期：2021-01-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11