Special fracture mechanics specimens for multilayer plastic pipes testing

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• 作者：P. Hutař ; L. Š ; está ; ková ; Z. Kné ; sl ; E. Nezbedová ; L. Ná ; hlí ; k
• 关键词：Multilayer plastic pipes ; C-type specimen ; K-calibration ; Fracture toughness ; Slow crack growth ; Non-homogenous specimens
• 刊名：Polymer Testing
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：28
• 期：8
• 页码：785-792
• 全文大小：754 K

文摘

Pipes consisting of layers of different materials (multilayer pipes) are considered. The fracture toughness value of the main pipe is taken into account as a parameter relevant to fracture assessment connected with the resistance of pipe material against slow crack growth. With the aim of simplifying estimation of main pipe material fracture toughness, non-homogeneous test specimens cut directly from multi-layer pipes are suggested and numerically analysed. The values of the corresponding stress intensity factor K_I and biaxiality factors B are calculated for the case of two and three layer test specimens. Based on the results obtained, the transferability of fracture toughness values measured on laboratory specimens to pipe systems is discussed. It is shown that in most cases of multi-layer commercial pipes and routine fracture toughness measurements the values of the stress intensity factor calculated on the basis of homogeneous specimens can be used.