Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7195981 | Theoretical and Applied Fracture Mechanics | 2018 | 10 Pages |
Abstract
Conventional η factor equation in ASTM 1820 for CT specimen is based on elastic-perfectly plastic material behavior. Also, it is applicable for deeply cracked specimen (a/Wâ¯>â¯0.45). However, actual material always shows strain hardening behavior. Additionally, it may be sometimes needed to test CT specimens with relatively lower a/W (i.e. <0.45) to match the low constraint condition of some actual crack geometry. For both these conditions, η factor equation is not presently available in the open literature. Based on elastic-plastic FEA, the present work proposes a new plastic η factor (ηpl) equation for CT specimen considering Ramberg-Osgood material hardening index. The proposed equation is applicable for both shallow and deeply cracked CT specimen. The independency of ηpl with respect to applied load level and other R-O parameters have also been checked. The accuracy of predictions of proposed ηpl equation has also been indirectly checked.
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Authors
Deeprodyuti Sen, J. Chattopadhyay,