Unified parameter of in-plane and out-of-plane constraint effects and its correlation with brittle fracture toughness of steel

被引：28
|
作者：
Mu, M. Y. [1 ]
Wang, G. Z. [1 ]
Xuan, F. Z. [1 ]
Tu, S. T. [1 ]
机构：
[1] E China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FRACTURE | 2014年 / 190卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
In-plane constraint; Out-of-plane constraint; Brittle fracture toughness; Equivalent plastic strain; Finite element; Steel; CRACK BORDER FIELD; TRIAXIALITY PARAMETER; FAMILY;
D O I：
10.1007/s10704-014-9976-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, the equivalent plastic strain distributions ahead of crack tips for the experimental specimens with combined in-plane and out-of-plane constraints under brittle fracture condition in the literature were calculated by three-dimensional finite element. The constraint parameter based on the areas surrounded by isolines ahead of crack tips has been comparatively analyzed with several constraint parameters (-stress, , and stress triaxiality ) based on the crack-tip stress fields, and the capability of parameter for characterizing in-plane and out-of-plane crack-tip constraint effects for brittle fracture has been identified. The results show that the parameter has a good correlation with brittle fracture toughness and of various specimens with different constraint levels, and it is a unified measure parameter of in-plane and out-of-plane constraint for brittle fracture. The unified correlation lines and formulae of the normalized brittle fracture toughness and with have been obtained for the steel, and they may be used to determine constraint-dependent or structurally relevant fracture toughness of specimens or cracked components with any constraint levels. The application methodology of the constraint parameter for structural integrity assessments needs to be further investigated by numerical calculations and experiments.
引用
收藏
页码：87 / 98
页数：12
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