Strength predictions by applied effective volume theory in short-glass-fibre-reinforced plastics |
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| Institution: | 1. Center for Technology Innovation – Mechanical Engineering, Research & Development Group, Hitachi, Ltd., Hitachinaka, Japan;2. Department of Mechanical Engineering, Ritsumeikan University, Kusatsu, Japan;1. The Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology, Guangzhou 510640, China;2. Research and Development Department, Zhejiang Zhongning Silicon Company Ltd, QuZhou 324000, China;3. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;1. College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen 518060, PR China;2. Key Laboratory of Optoelectronic Devices and System of Ministry Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, PR China;1. MMRI/ CAPPA-D, Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada;2. 3M Canada Company, London, Ontario, Canada;1. School of Mechanical, Aerospace and Civil Engineering, United Kingdom;2. North West Composites Centre, School of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom |
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| Abstract: | Uniaxial stresses were evaluated under flexural, tensile and torsional tests with various fibre volume fractions, vf, and specimen sizes to develop simple and effective predictions on the quasi-static strength of compression-moulded short-glass-fibre-reinforced phenolic resin. The distributions in fibre orientation and fibre length were represented by Weibull and normal distributions, regardless of vf. The size effect was characterized by uniaxial stress testing and Weibull statistical analysis. The effective volume theory (EVT) was used to predict the quasi-static strength for vf of 0.0 with a scale parameter of 108.2 MPa and a shape parameter of 8.92. Strength prediction while considering Veff and vf was proposed by applying the EVT of the resin matrix to a method that combined a modified rule of mixtures and the Thai-Hill failure criterion. The measured value agreed well with the prediction for each Veff and vf, regardless of manufacturing defects in the matrix resin. |
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| Keywords: | Short-fibre-reinforced-plastic Quasi-static strength Size effect Fibre distribution Weibull statistical theory |
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