Essential work of fracture,crack tip opening displacement,and J-integral relationship for a ductile polymer film |
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| Institution: | 1. Department of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran;2. Department of Chemical Engineering, CREPEC, École Polytechnique, CP 6079, Succ. Centre-ville, Montreal, Quebec H3C 3A7, Canada;1. Faculty of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran;2. Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran |
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| Abstract: | A unique set of double-edge notched tension specimens of a Polyethylene Terephthalate Glycol-modified film was tested in mode I, plane stress. The load was registered on a universal testing machine. The displacements, ligament lengths, and video frames were recorded by a Digital Image Correlation system. With these registered data, the essential work of fracture, J-integral, and crack tip opening displacement (CTOD) fracture concepts have been applied. The onset of crack initiation was through a complete yielded ligament. The analysis showed that the intrinsic specific work of fracture, we, is the specific energy just up to crack initiation, which is an initiation value. we has both a coincident value and the same conceptual meaning as Jo, the J-integral at the onset of crack initiation. The relationship between Jo and CTOD is also determined. The influence on the notch quality when the specimens were sharpened by two different procedures, femtosecond laser ablation and razor blade sliding, was analysed in detail. |
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| Keywords: | Essential work of fracture J-integral Polymer film |
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