Formulation of Failure Strain according to Average Stress Triaxiality of Low Temperature High Strength Steel (EH36)

Abstract

Average stress triaxiality 평균 응력 삼축비, Equivalent plastic strain 등가 소성 변형률, Failure strain 파단변형률, Average true stress 평균 진응력 KEY WORDS: Stress triaxiality is recognized as one of the most important factors for predicting the failure strain of ductile metals. This study dealt with the effect of the average stress triaxiality on the failure strain of a typical low-temperature high-strength marine structural steel, EH36. Tensile tests were carried out on flat specimens with different notches, from relatively smooth to very sharp levels. Numerical simulations of each specimen were performed by using ABAQUS. The failure initiation points in numerical simulations were identified from a comparison of the engineering stress vs. strain curves obtained from experiments with simulated ones. The failure strain curves for various dimensionless critical energy levels were established in the average stress triaxiality domain and compared with the identified failure strain points. It was observed that most of the failure initiation points were approximated with a 100% dimensionless critical energy curve. It was concluded that the failure strains were well expressed as a function of the average stress triaxiality.

Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part I Theoretical Background and Experimental Studies

“…This paper proposes a three-dimensional failure strain surface for a ductile steel, called a low-temperature high-tensile steel (EH36), using average stress triaxiality and average normalized lode parameter, along with briefly introducing their theoretical background. It is an extension of previous works by Choung et al (2011;2014a;2014b) and Choung and Nam (2013) …”

“…소위 GTN ( (Lemaitre, 1985;Bonora et al, 2006;Choung, 2009b). (Bao and Wierzbicki, 2004;Bao, 2005;Choung et al, 2012;Choung and Nam, 2013;Choung et al, 2014a;Choung et al, 2014b). (Bai and Wierzbicki, 2008;Luo and Wierzbicki, 2010;Lou et al, 2012;Bai and Wierzbicki, 2010;Dunand and Mohr, 2011;Lou and Huh, 2013).…”

Development of Three-Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part II Formulation of Fracture Strain Surface

“…본 연구는 이전 연구의 확장이므로 이전에 수행된 실험 및 수치 해석적 과정 과 제시된 파단 변형률 곡선에 대하여도 고찰하였다 (Choung et al, 2011;Choung et al, 2012;Choung et al, 2014a;Choung et al, 2014b;Choung and Nam, 2013). (Choung and Nam, 2013). …”

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KEY WORDS:Average stress triaxiality 평균 응력 삼축비, Averge normalized lode parameter 평균 정규 로드 파라메터, Fracture strain surface 파단 변형률 평면, Uniuform true stress 균일 진 응력, Corrected true stress 수정 진 응력 ABSTRACT: An extended study was conducted on the fracture criterion by Choung et al (2011;2012) and Choung and Nam (2013)

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Fracture Simulation of Low-Temperature High-Strength Steel (EH36) using User-Subroutine of Commercial Finite Element Code

“…(c) flat notch(R=16mm) specimens (Choung and Nam, 2013) 본 논문은 기존의 연구 (Choung et al, 2011;Choung et al, 2012;Choung and Nam, 2013) …”