The damage model was implemented into user subroutine of commercial ABAQUS code to calculate the damage accumulation in each time interval and to simulate the crack growth. The influence of crack configurations and residual stress on crack growth behavior in the presence of multiple surface cracks were studied through the variation of crack growth rate. With the relative surface crack sizes (a/t, a/c,) become larger and the distance between two cracks (s/c) becomes close, the interaction between two surface cracks were enhanced and the crack growth behavior was improved. Besides, the existence of residual tensile stress also accelerated the crack growth rate. According to the change of crack growth rates, the critical value of γcreep for combination of multiple creep surface cracks was assumed to be 1.27. As γcreep ≥ 1.27 two interacting cracks should be considered to combine into a new big crack otherwise they can be treated as isolated cracks, respectively.
GUO Wei
,
ZHAO Lei
,
XU Lianyong
,
HAN Yongdian
. The analysis of multiple surface cracks growth behavior under the interaction of creep cracks[J]. Transactions of The China Welding Institution, 2019
, 40(8)
: 44
-49
.
DOI: 10.12073/j.hjxb.2019400207
[1] Kamaya M, Miyokawa E, Kikuchi M. Growth prediction of two interacting surface cracks of dissimilar sizes[J]. Engineering Fracture Mechanics, 2010, 77(16):3120-3131.
[2] Si J, Xuan F Z, Tu S T. A numerical creep analysis on the interaction of twin semi-elliptical cracks[J]. International Journal of Pressure Vessels and Piping, 2008, 85(7):459-467.
[3] Xuan F Z, Si J, Tu S T. Rules for the assessment of interacting cracks under creep conditions[J]. Journal of Pressure Vessel Technology, 2010, 132(1):17-23.
[4] Xu L, Zhao L, Jing H, et al. Evaluation of multiple cracks interaction effect subjected to biaxial tension under creep regime[J]. International Journal of Mechanical Sciences, 2017, 122:203-214.
[5] Jiao Fujie, Zhang Wenjun, Yuan Zhikang. Nondestructive test of weld residual stresses by acoustoelastic technique[J]. China Welding, 1994, 3(1):45-52.
[6] 张星.残余应力作用下P92钢蠕变裂纹扩展研究[D].天津:天津大学, 2010.
[7] 许万剑,杨春丽,赵宏柱,等. 304不锈钢焊管应力腐蚀开裂原因[J].腐蚀与防护, 2014, 35(5):511-513 Xu Wanjian, Yang Chunli, Zhao Hongzhu, et al. Analysis on stress corrosion cracking of welded stainless steel pipe[J]. Corrosion&Protection, 2014, 35(5):511-513
[8] 赵雷.考虑拘束效应的高温下含缺陷P92管道寿命评估方法研究[D].天津:天津大学, 2012.
[9] 张文,荆洪阳,徐连勇.含埋藏球形缺陷管道蠕变裂纹萌生寿命的预测[J].焊接学报, 2017, 38(2):75-78 Zhang Wen, Jing Hongyang, Xu Lianyong. Prediction of creep crack initiation time in steel pipes with embedded spherical defects[J]. Transactions of the China Welding Institution, 2017, 38(2):75-78
[10] Yatomi M, Davies C M, Nikbin K M. Creep crack growth simulations in 316H stainless steel[J]. Engineering Fracture Mechanics, 2008, 75(18):5140-5150.
[11] 汪建华,陆皓,魏良武.固有应变有限元法预测焊接变形理论及其应用[J].焊接学报, 2002, 23(6):36-40 Wang Jianhau, Lu Hao, Wei Liangwu. Prediction of welding distortions based on theory of inherent strain by FEM and its application[J]. Transactions of the China Welding Institution, 2002, 23(6):36-40
[12] 梁伟,周亮,孙晓露,等.采用固有应变法预测超薄板的焊接变形[J].焊接学报, 2017, 38(3):103-106 Liang Wei, Zhou Liang, Sun Xiaoxia, et al. Prediction of the welding deformation of ultra-thin plates based on theory of inherent strain[J]. Transactions of the China Welding Institution, 2017, 38(3):103-106
