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Vol.42, No.1, 21 ~ 29, 2004
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| Title |
| Modeling of Ductile Fracture Toughness Using Advanced Indentation System |
| 주장복 Ju Jang Bog , 이정석 Lee Jeong Seog , 심홍석 Sim Hong Seog , 이승건 Lee Seung Geon , 권동일 Kwon Dong Il |
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| Abstract |
| Fracture properties of various structural steels were determined non-destructively using the advanced indentation system (AIS), which is developed on the basis of continuous indentation technique. In this study, conventional critical strain model was modified to predict the ductile fracture toughness from the AIS data. In deriving the ductile fracture toughness model, fracture strain and characteristic length were estimated using the stress triaxiality and the work-hardening exponent. AIS tests were conducted on carbon steels, stainless steels, aluminum alloys and copper alloys. For all these materials, the results of indentation test were compared to those of the standard fracture toughness test methods, which shows that the present analysis can predict successfully the ductile fracture toughness of structural steels. |
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| Key Words |
| Continuous indentation test, Ductile fracture toughness, Critical strain model, Stress triaxility, Work-hardening exponent |
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