Warning: fopen(/home/virtual/kwjs/journal/upload/ip_log/ip_log_2024-03.txt): failed to open stream: Permission denied in /home/virtual/lib/view_data.php on line 88 Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 89 Evaluation of Notch Location Effect on Ductile Crack Initiation at Strength Mismatched Joints by Finite Element Method and Ultrasonic-Mechatronics System

Journal of KWJS 2005;23(6):87-92.
Published online January 26, 2006.
[연구논문]유한요소법과 초음파 메카트로닉스 시스템에 의한 강도적 불균질 이음부의 노치위치에 따른 균열발생 한계 조건
, ,
 
Evaluation of Notch Location Effect on Ductile Crack Initiation at Strength Mismatched Joints by Finite Element Method and Ultrasonic-Mechatronics System
Gyu-Baek An, Han-Sur Bang, Masao Toyoda
Abstract
It has been well known that ductile fracture of steels is accelerated by triaxial stresses. The characteristics of ductile crack initiation in steels are evaluated quantitatively using a two-parameters criterion based on equivalent plastic strain and stress triaxiality. The present study focuses on the effects of strength mismatch, which can elevate plastic constraint due to heterogeneous plastic straining, on the critical condition for ductile fracture initiation usinga two-parameter criterion. Fracture initiation testing has been conducted under static loading using notched round bar specimens which had different notch locations. This study provides the fundamental clarification of the effect of strength mismatching and effect of notch location on the critical condition to ductile crack initiation from notch root using finite element method and ultrasonic-mechatronics system. The critical condition of ductile crack initiation from notch root of strength mismatched tensile specimens under static loading appeared to be almost the same as those of homogeneous tensile specimens with circumferential sharp notch specimen. Also, the effect of notch location in mismatched specimens was estimated using finite element(FE) analyses.
TOOLS
METRICS Graph View
  • 1,607 View
  • 0 Download
Related articles


ABOUT
BROWSE ARTICLES
ARTICLE CATEGORY 
FOR CONTRIBUTORS
Editorial Office
#304, San-Jeong Building, 23, Gukhoe-daero 66-gil, Yeongdeungpo-gu, Seoul 07237, Korea
Tel: +82-2-538-6511    Fax: +82-2-538-6510    E-mail: koweld@kwjs.or.kr                

Copyright © 2024 by The Korean Welding and Joining Society.

Developed in M2PI