Failure strain formulation via average stress triaxiality of an EH36 high strength steel

被引：25
作者：
Choung, Joonmo [1 ]
Nam, Woongshik [1 ]
Lee, Daeyong [2 ]
Song, Chang Yong [3 ]
机构：
[1] Inha Univ, Sch Aerosp Naval Architecture & Ind Engn, Inchon 402751, South Korea
[2] Res Inst Ind Sci & Technol, Steel Struct Res Div, Inchon 406840, South Korea
[3] Mokpo Natl Univ, Dept Ocean Engn, Jeonnam 534729, South Korea
来源：
OCEAN ENGINEERING | 2014年 / 91卷
基金：
新加坡国家研究基金会;
关键词：
Average stress triaxiality; Equivalent plastic strain; Failure strain; Average true stress; EH36; FRACTURE;
D O I：
10.1016/j.oceaneng.2014.09.019
中图分类号：
U6 [水路运输]; P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
The paper deals with formulation of failure strain according to average stress triaxiality of a low temperature high-tensile steel, EH36, used for mainly arctic marine structures. Stress triaxiality is recognized as one of the important factors for prediction of failure strain of ductile metals. A number of tensile tests are carried out for flat specimens with different notches from relatively smooth to very sharp levels. Numerical simulations of each specimen are performed via nonlinear finite element analysis (FEA). By means of comparing engineering stress versus strain curves obtained from the tests with simulated ones, failure initiation in numerical simulations are identified. Equivalent plastic strains to fracture are plotted in average stress triaxiality domain, then a new failure strain formula is proposed in relatively low average stress triaxiality region. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：218 / 226
页数：9
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