期刊
THEORETICAL AND APPLIED FRACTURE MECHANICS
卷 90, 期 -, 页码 53-64出版社
ELSEVIER
DOI: 10.1016/j.tafmec.2017.02.011
关键词
Mixed mode I/III; Fracture toughness experiment; New test specimen; Polycrystalline graphite; Theoretical assessment
In the present contribution, mixed mode I/III fracture toughness of a polycrystalline graphite is studied experimentally, numerically and theoretically using a new designed test specimen. A simple disc shape specimen subjected to three-point bending named herein edge notched disc bend (ENDB), is successfully employed for fracture toughness experiments on graphite. This specimen can introduce full combination of modes I and III including pure mode I, pure mode III and complete intermediate mode mixities. Fracture toughness values (K-Ic and K-IIIc) of investigated graphite are obtained for six different mode mixities for and the obtained experimental data are compared with theoretical predictions of two conventional mixed mode fracture theories namely: maximum tangential stress (MTS) and maximum tangential strain energy density (MTSED). It has been observed that the fracture toughness results are in good agreement with the mixed mode I/III curve of MTSED criterion. Consequently, the suggested ENDB specimen can be proposed as a suitable specimen for mixed mode I/III fracture toughness study of based on graphite materials. (C) 2017 Elsevier Ltd. All rights reserved.
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