Paper Title:
Effect of Strength Mismatch on Ductile Crack Initiation Behavior from Notch Root under Static Loading
  Abstract

It has been well known that ductile fractures of steels are accelerated by triaxial stresses. The characteristics of ductile crack initiation in steels are evaluated quantitatively using two-parameter criterion based on equivalent plastic strain and stress triaxiality. It has been demonstrated by authors using round-bar specimens with circumferential notch in single tension that the critical strain to initiate ductile crack from specimen center depends considerably on stress triaxiality, but surface cracking of notch root is in accordance with constant strain condition. This study fundamentally clarifies the effect of strength mismatch, which can elevate plastic constraint due to heterogeneous plastic straining under static loading, on critical conditions for ductile cracking from the pre-notch root. In order to evaluate the stress/strain state in the pre-notch root of specimens, a thermal elastic-plastic finite element (FE) analysis has been carried out.

  Info
Periodical
Key Engineering Materials (Volumes 297-300)
Edited by
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
Pages
756-761
DOI
10.4028/www.scientific.net/KEM.297-300.756
Citation
G. B. An, M. Ohata, M. Mochizuki, H. S. Bang, M. Toyoda, "Effect of Strength Mismatch on Ductile Crack Initiation Behavior from Notch Root under Static Loading ", Key Engineering Materials, Vols. 297-300, pp. 756-761, 2005
Online since
November 2005
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Price
$35.00
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