Ductile fracture initiation near axial crack fronts in pressure tubes of hydrided irradiated Zr-2.5Nb materials with split circumferential hydrides

被引：6

作者：

Sung, Shin-Jang ^{[1
]}

Pan, Jwo ^{[1
]}

Lam, Poh-Sang ^{[2
]}

Scarth, Douglas A. ^{[3
]}

机构：

[1] Univ Michigan, Mech Engn, Ann Arbor, MI 48109 USA

[2] Savannah River Natl Lab, Aiken, SC USA

[3] Kinectrics Inc, Toronto, ON, Canada

来源：

ENGINEERING FRACTURE MECHANICS | 2017年 / 186卷

关键词：

Zr-2.5Nb; Hydrides; Fracture initiation; Stress triaxiality; Pressure tube; STRESS TRIAXIALITY; STRAIN;

D O I：

10.1016/j.engfracmech.2017.09.003

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Ductile fracture initiation with consideration of strain concentration and stress triaxiality near axial crack fronts in pressure tube (PT) specimens of hydrided irradiated Zr-2.5Nb materials with split circumferential hydrides is examined by three-dimensional finite element analyses with submodeling. For a PT specimen with split circumferential hydrides, strain concentration occurs in the middle of the ligaments ahead of the crack front. The computational results suggest that only 60-70% of the internal pressure for fracture initiation of an unhydrided irradiated PT specimen is needed to fracture a hydrided irradiated PT specimen with many split circumferential hydrides along the crack front. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：1 / 20

页数：20

共 14 条

[1] On fracture locus in the equivalent strain and stress triaxiality space [J].