Crack-craze opening profiles near a crack tip in a polytetrafluoroethylene

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• 作者：L.C.S. Nunes ; ^{luizcsn@mec.uff.br}
• 关键词：Fracture ; Polytetrafluoroethylene ; Digital image correlation method
• 刊名：Polymer Testing
• 出版年：2012
• 期刊代码：143_01429418
• 类别：et
• 出版时间：May, 2012
• 卷：31
• 期：3
• 页码：375-383
• 文件大小：1522 K

摘要

The crack opening and craze profiles near a crack tip in a polytetrafluoroethylene have been experimentally investigated. A double-edge-crack plate specimen under uniaxial tensile load was used in the experiment and the experimental procedure was performed using the Digital Image Correlation method, which is a well-established optical-numerical method for estimating full-field displacement. A theoretical model of the stress intensity factor based on linear elastic fracture mechanics combined with a classical saturated expression was proposed. The proposed model is in good agreement with experimental data and predictions of the model may be used to verify the non-linear behavior from crack and craze (cohesive) zones.