Shear driven deformation and damage mechanisms in High-performance carbon Fibre-reinforced thermoplastic and toughened thermoset composites subjected to high strain loading

Hernandez Thibault P. A.; Mills Andrew R.; Nezhad Hamed Yazdani

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Shear driven deformation and damage mechanisms in High-performance carbon Fibre-reinforced thermoplastic and toughened thermoset composites subjected to high strain loading

机译：高性能碳纤维增强热塑性和钢化热固性复合材料的剪切驱动的变形和损伤机制进行高菌株负荷

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High strain loading response of high-performance aerospace grade polyether-ether-ketone (PEEK) and toughened epoxy carbon fibre-reinforced composites has been investigated in pre-impregnated laminates having identical carbon fibre volume fraction, i.e. nearly 65%. Tensile cyclic loading tests have been carried out on the laminates with [ +/- 45 degrees](8S) stacking sequence, in order to characterise inelastic (plasticity) parameters for the two laminates progressively up to high strains (up to 11% strains), in correlation with the fibre and matrix micro-scale deformation and damage characteristics. The most suitable processes to achieve ultimate mechanical performance were used for manufacturing of the laminates. It has been observed that the PEEK composite exhibits higher mechanical performance at high strains under cyclic loads compared to epoxy composites (150% ultimate failure strain, 380% strain hardening and 200% ultimate failure stress) due to having superior micro-scale shear deformation in PEEK attributed to interfacial strength of fibre-matrix prior to the ultimate failure, as opposed to extensive micro-cracking, coalescence and fibre-matrix debonding in the epoxy composite.

机译：在具有相同碳纤维体积分数的预浸渍层压材料中研究了高性能航空航天级聚醚 - 醚 - 醚 - 酮（PEEK）和增韧环氧碳纤维增强复合材料的高菌株加载响应。即近65％。已经在具有[+/- 45度]（8S）堆叠序列的层压板上进行了拉伸循环加载试验，以表征两种层压板的无弹性（可塑性）参数逐渐高达高菌株（高达11％的菌株），与光纤和矩阵微尺度变形和损坏特性相关。最适合实现最终机械性能的过程用于制造层压板。已经观察到，由于具有优异的微观剪切变形，PEEK复合材料在环状负载下的高菌株下在循环载荷下表现出更高的机械性能，这是由于具有优异的微观剪切变形，因此循环载荷（150％的最终的损伤株，380％的菌株硬化和200％的终极衰竭应力）在最终失败之前窥视纤维矩阵的界面强度，而不是在环氧复合材料中广泛的微裂化，聚结和纤维 - 基质脱粘。

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来源
《Composite Structures》 |2021年第4期|113289.1-113289.8|共8页
作者
Hernandez Thibault P. A.; Mills Andrew R.; Nezhad Hamed Yazdani;
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作者单位

Cranfield Univ Enhanced Composites & Struct Ctr Sch Aerosp Cranfield Beds England;

Cranfield Univ Enhanced Composites & Struct Ctr Sch Aerosp Cranfield Beds England;

City Univ London Aeronaut & Aerosp Res Ctr Dept Mech Engn & Aeronaut London England;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
CFRP composite; PEEK; Shear damage; Plasticity; High strain; Fibre-matrix debonding;

机译：CFRP复合材料;PEEK;剪切损伤;可塑性;高菌株;光纤矩阵剥离;

Shear driven deformation and damage mechanisms in High-performance carbon Fibre-reinforced thermoplastic and toughened thermoset composites subjected to high strain loading

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