Fracture toughness of gamma irradiated polycarbonate sheet using the essential work of fracture |
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| Institution: | 1. Polymer Processing and Flow (P-PROF) Group, School of Energy, Environment and Materials, King Mongkut''s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok, 10140, Thailand;2. Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Rd., Ladyao, Chatuchak, Bangkok, 10900, Thailand;1. CEITEC – Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, 612 00 Brno, Czechia;2. Unipetrol RPA, Ltd., Polymer Institute Brno, Tkalcovska 36/2, 656 49 Brno, Czechia;3. Ratiochem, Ltd., Tkalcovska 36/2, 602 00 Brno, Czechia;1. Department of Railway Engineering, School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;2. Trelleborg Industrial Anti-Vibration Systems, Leicester LE4 2BN, UK;2. Department of Civil Engineering, Federal University of São Carlos, Brazil;3. Federal Centre for Technological Education of Minas Gerais, Department of Civil Engineering, Brazil;4. Advanced Composites Centre for Innovation and Science, University of Bristol, UK;1. Department of Power Mechanical Engineering, National Formosa University, Yunlin 632, Taiwan;2. Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan;3. Electronics and Optoelectronics Research Laboratories (EORL), Industrial Technology Research Institute (ITRI), Taiwan |
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| Abstract: | Polycarbonate (PC), a ductile polymer, has been found by both linear elastic fracture mechanics and impact tests to present a ductile-brittle transition, which depends on notched specimen thickness, test speed and gamma irradiation. Owing to large amounts of plastic deformation, fracture toughness measurements by these test methods are not precise. In the present communication, a better method, the Essential Work of Fracture (EWF), to assess the fracture characteristics in plane state of stress was for the first time used to evaluate the fracture toughness of PC sheets subjected to gamma irradiation dose. Three-points bend tests of sharp pre-cracked specimens with different ligament lengths were 340 kGy gamma irradiated. EWF results showed that the total fracture work increased linearly with length for both non-irradiated and gamma irradiated conditions. A significant decrease in EWF fracture toughness was associated with brittleness promoted by gamma irradiation. This brittleness was also confirmed by macro and microscopy (SEM) evidence. |
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| Keywords: | Essential work of fracture Fracture toughness Gamma irradiation Polycarbonate |
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