Crack Growth Analysis in Weld-Heat Affected Zone Using S-Version FEM

2010 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yuto Shimizu ◽  
Yulong Li
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Crack Growth ◽  
Heat Affected Zone ◽  
Growth Analysis ◽  
Three Dimensional ◽  
Crack Growth Behavior ◽  
Residual Stress Field ◽  
Energy Agency ◽  
Thermal Stress Field

Fracture in the heat affected zone (HAZ) in welding has been a serious problem for the integrity of machines. Prediction of fracture behavior due to the residual stress field in HAZ is important. In this paper, the S-Version FEM(S-FEM) is applied to simulate the crack growth under thermal and residual stress fields. For evaluation of the stress intensity factor, the virtual crack closure integral method (VCCM) is employed. In order to confirm the validity of this analysis, numerical results are compared with previously reported analytical and experimental results. Then, a crack growth analysis in a piping structure with a welding joint was conducted. The residual stress data was provided by JAEA, Japan Atomic Energy Agency, based on their numerical simulation. Using S-FEM, two- and three-dimensional analyses are conducted, and crack growth behavior under thermal stress field is studied and discussed.

Stress Corrosion Cracking Analysis under Thermal Residual Stress Field Using S-FEM

2011 ◽  
Vol 462-463 ◽  
pp. 431-436 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yuto Shimizu ◽  
Yu Long Li
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Crack Growth ◽  
Fracture Behavior ◽  
Three Dimensional ◽  
Stress Fields ◽  
Crack Growth Behavior ◽  
Residual Stress Field ◽  
Energy Agency ◽  
Thermal Stress Field

Fracture in heat affected zone (HAZ) in welding has been a serious problem for the integrity of machines. Prediction of fracture behavior due to the residual stress field in HAZ is important. In this paper, S-Version FEM(S-FEM) is applied to simulate the crack growth under thermal and residual stress fields. For evaluation of stress intensity factor, virtual crack closure integral method (VCCM) is employed. In order to confirm the validity of this analysis, numerical results are compared with previously-reported analytical and experimental results. Then, crack growth analysis in piping structure with welding joint was conducted. The residual stress data was provided by JAEA, Japan Atomic Energy Agency, based on their numerical simulation. Using S-FEM, two- and three-dimensional analyses are conducted, and crack growth behavior under thermal stress field is studied and discussed.

Numerical Simulation of Stress Corrosion Cracking in a Pipe Using S-Version FEM

2010 ◽  
Vol 452-453 ◽  
pp. 577-580
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yuto Shimizu ◽  
Yu Long Li
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Crack Growth ◽  
Fracture Behavior ◽  
Three Dimensional ◽  
Stress Fields ◽  
Crack Growth Behavior ◽  
Stress Distributions ◽  
Residual Stress Field ◽  
Energy Agency

Fracture in heat affected zone (HAZ) in welding has been a serious problem for the integrity of machines. Prediction of fracture behavior due to the residual stress field in HAZ is important. In this paper, S-Version FEM(S-FEM) is applied to simulate the crack growth under thermal and residual stress fields. For evaluation of stress intensity factor, virtual crack closure integral method (VCCM) is employed. The residual stress data was provided by JAEA, Japan Atomic Energy Agency, based on their numerical simulation. SCC crack growth of a surface crack at inner suface of a pipe under thermal residual stress is simulated in three-dimensional filed. Distributions of residual stress is not axi-symmetric along pipe wall, and it affects the crack growth behavior. Ttwo cases, for axi-symmetric and non-symmetric thermal stress distributions, are assumed and crack growth behaviors are obtaiend and discussed.

scholarly journals Methodology for Evaluation of Residual Stress Effect on Small Corner-Crack Initiation and Growth

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2904 ◽  
Author(s):  
Janghwan Kim ◽  
Jun Won Kang ◽  
Dong-Eun Lee ◽  
Dae Young Kim
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Crack Growth ◽  
Type Specimen ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Beam Specimen ◽  
Stress Effect ◽  
Residual Stress Field ◽  
Corner Crack

The growth behavior of a naturally initiated corner crack under a uniform residual stress field is investigated in this study. A convenient method is proposed to induce and evaluate the uniform residual stress field for a beam-type specimen. Fatigue tests are conducted with a rotary bending fatigue machine to investigate the growth of the corner crack. For this reason, a cylindrical specimen, which is typically used for rotating bending tests, is modified into a beam specimen. The corner crack growth behavior under residual stress is evaluated based on linear elastic fracture mechanics (LEFM) and compared with long through crack data. The test results verify that the corner crack growth under residual stress can be effectively evaluated by LEFM and estimated using long crack data.

Study of Crack Extension Effects on a Weld-Induced Residual Stress Field

2013 ◽  
Author(s):  
Jeong K. Hong ◽  
Thomas P. Forte
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Service Life ◽  
Stress Field ◽  
Residual Stresses ◽  
Crack Growth ◽  
Crack Extension ◽  
Growth Analysis ◽  
Crack Tip ◽  
Residual Stress Field

For many applications, welding is the best manufacturing process for joining two separate components. However, the welding process with its highly localized heating and cooling results in the residual stresses both along the surface and through the thickness of the joint. These residual stresses will affect the rate of growth of a fatigue crack as it propagates through the joint and therefore will affect the service life. Therefore, service life predictions must consider the residual stresses as well as their redistribution that occurs as the crack grows. Analytical approaches to assess fitness-for-service such as API 579 are available to evaluate the effect of weld-induced residual stresses. However, current industry practices calculate stress intensity factors (SIFs) for fracture and fatigue crack growth life estimates without considering the redistribution of the residual stresses as the crack propagates, and thus tend to be very conservative. In this paper, Battelle’s weld residual stress modeling methods are combined with a procedure for calculating the SIF using local crack tip displacements that accounts for the redistribution of the residual stresses due to crack extension. In addition, the finite element model used to determine the weld residual stresses is also used to determine the SIF. Therefore, the complete mechanical response to the welding, including residual stress, deformed geometry, elastic and plastic strains, etc. are available for the crack growth analysis. This new unified procedure is demonstrated for simple joints and is compared to a “simplified” crack growth analysis that uses stress mapping. The unified procedure clearly characterizes mixed mode crack behavior at the crack tip. In this paper the procedure is presented in terms of how the crack affects the weld-induced residual stress field; it is equally well suited for practical design use to assess structural integrity in the presence of a weld-induced residual stress field with or without external service loading.

Simulation of Stress Corrosion Cracking in ICM Housing of Nuclear Power Plant

2012 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Kazuhiro Suga ◽  
Fuminori Iwamatsu ◽  
Yuichi Shintaku
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Stress Corrosion ◽  
Crack Growth ◽  
Stress Corrosion Cracking ◽  
Growth Behavior ◽  
Corrosion Cracking ◽  
Stress Fields ◽  
Crack Growth Behavior ◽  
Residual Stress Field

It has been reported that stress corrosion cracking damaged in-core monitor housing (ICM Housing), which occurred in a weld heat-affected zone because of the existence of residual stress. So it is important to evaluate crack growth behavior with high accuracy. In this study, crack growth behavior in ICM Housing is estimated using S-version FEM (S-FEM), which allows generation of the core finite model and the detailed mesh representing the crack independently. At first, axial, slant and circumferential surface cracks are assumed at two locations where residual stress fields are different from each other. One is isotropic residual stress field, and the other is circumferential residual stress field. It is shown that crack growth behaviors are different under different residual stress fields. Next, the effect of the slit, which exists between the ICM Housing and the Pressure Vessel is evaluated. It is shown that the existences of the slit increases stress intensity factors of growing surface crack. Finally S-FEM results are compared with those of the Influence Function Method (IFM), which assumes that an elliptical crack shape exists in a plate. It is shown that IFM result is conservative comparing to that of S-FEM.

Analysis of Thermal Stresses and Residual Stress Changes in Railroad Wheels Caused by Severe Drag Braking

1977 ◽  
Vol 99 (1) ◽  
pp. 18-23 ◽  
Author(s):  
M. R. Johnson ◽  
R. E. Welch ◽  
K. S. Yeung
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Yield Point ◽  
Thermal Stresses ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Residual Stress Field ◽  
Thermal Stress Field ◽  
Stress Changes ◽  
Railroad Wheels

A finite-element computer program, which takes into consideration nonlinear material behavior after the yield point has been exceeded, has been used to analyze the thermal stresses in railroad freight car wheels subjected to severe drag brake heating. The analysis has been used with typical wheel material properties and wheel configurations to determine the thermal stress field and the extent of regions in the wheel where the yield point is exceeded. The resulting changes in the residual stress field after the wheel has cooled to ambient temperature have also been calculated. It is shown that severe drag braking can lead to the development of residual circumferential tensile stresses in the rim and radial compressive stresses in the plate near both the hub and rim fillets.

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