Fractographic relation between progressive failure and strain measurement techniques for recently developed configuration of carbon fiber/epoxy laminate

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• 作者：Jan Mayé ; n^a ; ^{jmayen@cenidet.edu.mx} ; Arturo Abú ; ndez^a ; Enrique Alcudia^a ; José ; Antonio Arellano^a ; Jorge Colí ; n^a ; Isa Pereyra^b ; Ivá ; n Puente-Lee^c
• 关键词：Carbon fiber/epoxy laminates ; Composites ; Fractography ; Tensile failure ; SEM
• 刊名：Polymer Testing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：57
• 期：Complete
• 页码：156-164
• 全文大小：3778 K
• 卷排序：57

文摘

In this work, fracture mechanisms of a newly developed carbon fiber/epoxy laminate [+75/0/-75]s were assessed by scanning electron microscopy (SEM). The composite strain-stress curves were plotted with the displacement information simultaneously acquired from both a tensile testing machine crosshead and an extensometer. The strain-stress curve plotted with the displacement data from the machine test showed an average slope change from E1m = 22.783 GPa to E2m = 13.170 GPa on about 65% of the total strain before global failure, while strain-stress curves plotted with displacement data from the extensometer showed one single slope. While results reported in literature related to composite failure mechanisms, where some authors reported a slope change in strain-stress curves associated to progressive failure, experimental evidence in this work for strain-stress curves showed one single slope, indicating that such slope change is related to the strain measuring technique, and not to a progressive failure. The fracture surface was studied, and four main features were observed, which were related to failure mechanisms during the uniaxial test. The identified failure mechanisms occurred on a stage above 93% of the total strain before global failure.