Strain and stress concentration of ductile composites in full-range deformation by digital image correlation

This study investigates the variation in open-hole strain/stress concentrations within the full deformation range of a ductile self-reinforced poly (ethylene terephthalate) (srPET) composite using the digital image correlation (DIC). Subsequently, DIC was applied to brittle open-hole polymethyl meth...

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Bibliographic Details
Published inMechanics of advanced materials and structures Vol. 30; no. 18; pp. 3817 - 3825
Main Authors Wu, Chang-Mou, Kumar, Sanjay, Lin, Po-Chun, Chen, Jieng-Chiang
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 17.09.2023
Taylor & Francis Ltd
Subjects
Deformation
digital image correlation
Digital imaging
mechanical testing
Polymethyl methacrylate
Self-reinforced PET composites
Strain concentration
strain/stress concentration effect
Stress concentration
yielding
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Summary:This study investigates the variation in open-hole strain/stress concentrations within the full deformation range of a ductile self-reinforced poly (ethylene terephthalate) (srPET) composite using the digital image correlation (DIC). Subsequently, DIC was applied to brittle open-hole polymethyl methacrylate (PMMA) for comparison. This demonstrated the influence of the ductility of srPET. The strain concentration factor (K ɛ ) of PMMA was constant with a full deformation range and agreed with theoretical concentration factor (K t ). By contrast, the K ɛ of srPETs was divided into five stages based on the propagation of yield extent (beginning from the hole edge) of the specimen, starting from K t and then increasing to the peak, followed by the lowest value.
ISSN:1537-6494
1537-6532
DOI:10.1080/15376494.2022.2084192