Quantitative characterization of creep constraint induced by crack depths in compact tension specimens

被引：68

作者：

Sun, P. J. ^{[1
]}

Wang, G. Z. ^{[1
]}

Xuan, F. Z. ^{[1
]}

Tu, S. T. ^{[1
]}

Wang, Z. D. ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Sch Mech & Power Engn, MOE Key Lab Safety Sci Pressurized Syst, Shanghai 200237, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2011年 / 78卷 / 04期

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

Constraint; Creep; Crack depth; Crack-tip stress; CT specimen; TIP FIELDS; FRACTURE; GROWTH; PARAMETER;

D O I：

10.1016/j.engfracmech.2010.11.017

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

In this paper, the C(t) and C* integrals, stress redistribution time t(red) and creep crack-tip stress distributions in the CT specimens with various crack depths have been calculated by the finite element method (FEM), and the creep constraint induced by crack depths are quantitatively investigated in detail. The results show that the creep constraint could be characterized by the new constraint parameter R. The constraint effect induced by crack depths at non-steady-state creep is more pronounced than that at steady-state creep. The effects of the crack depths, load levels (C*) and distances from the crack tips on the creep constraint parameter R are analyzed. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：653 / 665

页数：13

共 29 条

[1] CRACK TIP FIELDS UNDER NONSTEADY CREEP CONDITIONS .1. ESTIMATES OF THE AMPLITUDE OF THE FIELDS [J].