K(IC) MODELING FOR A CRITICAL STRAIN CRITERION INVOLVING THE STRESS TRIAXIALITY EFFECT
SCIE
SCOPUS
- Title
- K(IC) MODELING FOR A CRITICAL STRAIN CRITERION INVOLVING THE STRESS TRIAXIALITY EFFECT
- Authors
- KIM, YH; KWON, D; LEE, S
- Date Issued
- 1994-06
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- An analytical model for predicting fracture toughness K(IC) is proposed based on a stress-modified critical strain criterion, that reflects the effect of stress triaxiality on ductile fracture. For K(IC) modelling, the notch-tip strain and stress states are given by introducing a singular field for the case of power-law-hardening materials. Notch fracture toughness is interpreted in terms of the notch-root radius (rho): K(IC) is predicted to increase with increasing rho, but has a minimum at a small rho. The microstructurally characteristic distance and the reference critical strain can be estimated by fitting the K(IC) vs rho data on the model equation. Finally, previous notch fracture-toughness data are re-analyzed with the proposed model: the current analysis explains well the interaction effect between the notch-tip strain field and the local-fracture-controlling microstructure even in the small rho range.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21957
- DOI
- 10.1016/0956-7151(94)90013-2
- ISSN
- 1359-6454
- Article Type
- Article
- Citation
- ACTA METALLURGICA ET MATERIALIA, vol. 42, no. 6, page. 1887 - 1891, 1994-06
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