Issues relating to numerical modelling of creep crack growth

被引：57

作者：

Yatomi, M. ^{[1
]}

Tabuchi, M. ^{[2
]}

机构：

[1] IHI Corp, Res Lab, Isogo Ku, Yokohama, Kanagawa 2358501, Japan

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

ENGINEERING FRACTURE MECHANICS | 2010年 / 77卷 / 15期

关键词：

Creep; Crack growth; FEM; Elevated temperature; C*; Prediction; CONTINUUM DAMAGE; PREDICTION; INITIATION; RUPTURE; STEELS;

D O I：

10.1016/j.engfracmech.2010.04.024

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

In this paper creep crack growth behaviour of P92 welds at 923 K are presented. Creep crack growth behaviour for P92 welds are discussed with C* parameter. Creep crack growth behaviour of P92 welds has been compared with that of P91 welds with C* parameter. NSW and NSW-MOD model were compared with the experimental creep crack growth data. Plane strain NSW model significantly overestimates the crack growth rate, and plane stress NSW model underestimates it. Whilst, NSW-MOD model for plane stress and plane strain conditions gives lower and upper bound of the experimental data, respectively. FE analysis of creep crack growth has been conducted. Constrain effect for welded joints has been examined with C* line integrals of C(T) specimens. As a result, constant C* value using the material data of welded joint gives 10 times lower than that of only HAZ property. Whilst, the predicted CCG rates for welded joint are 10 times higher than those for only HAZ properties. Compared with predicted CCG rate from FE analysis and the experimental CCG rate, it can be suggested that creep crack growth tests for lower load level or for large specimen should be conducted, otherwise the experimental data should give unconservative estimation for components operated in long years. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3043 / 3052

页数：10

共 25 条

[1]

[Anonymous], ANN BOOK ASTM STAND

[2]

Bell K., 1997, Elevated Temperature Midlife Weldment Cracking (Type IV) - A Review

[3] INTERGRANULAR FRACTURE DURING POWER-LAW CREEP UNDER MULTIAXIAL STRESSES [J].

COCKS, ACF ;

ASHBY, MF .

METAL SCIENCE, 1980, 14 (8-9) :395-402

[4]

ELLLIS FV, 1998, ASME PVP, V380, P59

[5] CREEP RUPTURE STRENGTH AND MICROSTRUCTURE OF LOW C-10Cr-2Mo HEAT-RESISTING STEELS WITH V AND Nb. [J].

Fujita, T. ;

Asakura, K. ;

Sawada, T. ;

Takamatsu, T. ;

Otoguro, Y. .

Metallurgical transactions. A, Physical metallurgy and materials science, 1981, 12 A (06) :1071-1079

[6]

HASEGAWA Y, 1998, P ADV HEAT RES STEEL

[7] DEVELOPMENT OF CONTINUUM DAMAGE IN THE CREEP-RUPTURE OF NOTCHED BARS [J].

HAYHURST, DR ;

DIMMER, PR ;

MORRISON, CJ .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1984, 311 (1516) :103-+

[8]

*HIBB KARLSS SOR I, ABAQUS VERS 6 6

[9] Creep crack growth in welds: a damage mechanics approach to predicting initiation and growth of circumferential cracks [J].

Hyde, TH ;

Sun, W ;

Becker, AA .

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING, 2001, 78 (11-12) :765-771

[10]

ISOBE N, 2008, 46 S STRENGTH MAT HI, P77

← 1 2 3 →