The influence of material mismatch of weld on the evaluation of time-dependent fracture mechanics parameters

被引：3
|
作者：
Tu, ST [1 ]
Yoon, KB
Gong, JM
机构：
[1] Nanjing Inst Chem Technol, Dept Mech Engn, Nanjing 210009, Peoples R China
[2] Chung Ang Univ, Dept Mech Engn, Seoul 156756, South Korea
来源：
CREEP AND FRACTURE OF ENGINEERING MATERIALS AND STRUCTURES | 2000年 / 171-1卷
关键词：
material mismatch; time-dependent fracture; weld; creep crack growth; testing standard;
D O I：
10.4028/www.scientific.net/KEM.171-174.51
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The influence of material mismatch on the stress field of uniaxial specimens and the time-dependent fracture mechanics parameters is studied in the present work. It is found that under the extensive creep condition C* value of hard weld /soft parent metal specimen can be significantly higher than that of single weld metal specimen, and the material mismatch has little influence on C(t) in small scale creep in the studied cases. It is proposed that the C* formula based on the load-line displacement recommended by ASTM E1457 needs to be modified to interpret the CCG behavior of welded specimens. Candidate modification factors have been proposed. A creep crack growth rate test on SENT specimens has been carried out. The CCG data interpretation in terms of the modified formula illustrates the errors by use of the conventional method.
引用
收藏
页码：51 / 59
页数：9
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