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.

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.

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.

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.

Crack Growth Analyses of SCC Under Various Residual Stress Distributions Near the Piping Butt-Welding

2007 ◽  
Author(s):  
Jinya Katsuyama ◽  
Wataru Asano ◽  
Kunio Onizawa ◽  
Masahito Mochizuki ◽  
Masao Toyoda
Keyword(s):  
Residual Stress ◽  
Crack Growth ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Stress Distributions ◽  
Contributing Factors ◽  
Butt Welding ◽  
Type 316L ◽  
Growth Analyses ◽  
Reactor Internals

Stress corrosion cracking (SCC) of core internals and/or recirculation pipes of austenite stainless steel (Type 316L) has been observed. When a SCC is detected at the reactor internals or pipes, it is necessary to calculate crack growth behavior of the crack for a certain operational period. The SCC initiates and grows near the welding zone because of high tensile residual stress by welding relative to the other contributing factors of material and environment. Therefore, the residual stress analysis due to welds of austenitic stainless piping is becoming important and has been already conducted by many researchers. In present work, the through-thickness residual stress distributions near multi-pass butt-welds of Type 316L pipes have been calculated by thermo-elastic-plastic analyses with the geometric and welding conditions changed and collected from literatures. Then crack growth simulations were performed using calculated and collected residual stress distributions. The effects of geometric and welding conditions on crack growth behavior were also 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.

Numerical Simulation on 3D Residual Stress Field of Both-Side Laser Shot Peened Specimen with Center-Hole

2010 ◽  
Vol 97-101 ◽  
pp. 3816-3819
Author(s):  
X.D. Yang ◽  
Jian Zhong Zhou ◽  
Shu Huang ◽  
Ling Ling Hu ◽  
Cheng Dong Wang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Residual Stress ◽  
Stress Field ◽  
Laser Shot ◽  
Bottom Surface ◽  
Stress Distributions ◽  
Residual Stress Field ◽  
Typical Experiment ◽  
Compressive Residual Stresses

A numerical analytical model for both-side laser shot peening (LSP) of specimen with center-hole was established, the influence of the center-hole on peening effect was investigated, and the 3D residual stress distributions of ZK60 specimen after one-side and both-side LSP were analyzed. The results showed that compressive residual stresses were obtained at the both sides of specimen after both-side LSP, with a stress value of -179.41MPa on the bottom surface, much larger than that of one-side LSP. The typical experiment of LSP for ZK60 specimen was carried out and the experimental data were well correlated with the simulated results.

Experimental and Numerical Investigation of Sub-Clad and Surface Cracks in Cladded Components

2008 ◽  
Author(s):  
Jo¨rg Hohe ◽  
Marcus Brand ◽  
Dieter Siegele
Keyword(s):  
Numerical Simulation ◽  
Heat Treatment ◽  
Residual Stress ◽  
Crack Extension ◽  
Fracture Behavior ◽  
Large Scale ◽  
Ferritic Steels ◽  
Surface Cracks ◽  
Residual Stress Field ◽  
Treatment Processes

The present study is concerned with the fracture behavior of sub-clad and surface cracks in components consisting of ferritic steels with an austenitic welded cladding. For this purpose, two tests on large scale specimens have been performed. The residual stress field has been determined by means of a numerical simulation of the welding and heat treatment processes. Based on the results, a numerical simulation of the component tests was performed in order to enable a fracture mechanics assessment of the conditions leading to crack initiation and arrest in the ferritic and austenitic regions. It was observed that in the present tests failure was initiated in the ferritic material whereas the austenitic cladding remained stable even in the case of a limited crack extension in the ferritic base metal.

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