Thermoelastoplastic Analysis of a Stainless Steel Plate Considering Phase Transformations

1993 ◽  
Vol 46 (11S) ◽  
pp. S12-S20 ◽  
Author(s):  
T. R. Tauchert ◽  
G. A. Webster ◽  
R. C. Reed
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Approximate Solution ◽  
Phase Transformations ◽  
Material Properties ◽  
Steel Plate ◽  
Phase Changes ◽  
Iterative Approach ◽  
Stress Distributions ◽  
Stainless Steel Plate

A quasistatic thermoelastoplastic analysis is given for the response of a traction-free plate subject to surface heating. The formulation incorporates temperature-induced phase changes which model experimentally obtained data for X22 CrMoV 12 1 stainless steel. The plate is discretized into layers, with material properties considered homogeneous within each layer. An incremental, iterative approach based upon Kirchhoff bending theory is employed to obtain an approximate solution to the problem. Numerical results illustrate the effects of phase transformations and temperature sensitivity of the material properties upon the transient and residual stress distributions.

Numerical Simulation of a Single Bead on Plate and Three Pass Slot Welds in Austenitic Stainless Steel

2011 ◽  
Author(s):  
Jijin Xu ◽  
Philippe Gilles
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Structural Integrity ◽  
Steel Plate ◽  
Task Group ◽  
Stress Fields ◽  
Stainless Steel Plate ◽  
First Case ◽  
Welding Processes

This paper provides the numerical simulations of two welding benchmark cases defined in the frame of the European Network on Neutron Techniques Standardization for Structural Integrity. The network involves over 35 organizations from industry and promotes the application of modern experimental and numerical techniques to problems related to the determination of residual stress and distortion in components. The first case issued by Task Group 1, addresses the estimation of residual stress fields around a single weld bead deposited on an austenitic stainless steel plate. The second case issued by Task Group 4, deals with the estimation of residual stress fields in a three-pass slot weld in an austenitic stainless steel plate. In both cases, the welding processes and types of material are same: tungsten-inert-gas welding and AISI 316 stainless steel. It is therefore of interest to compare these two studies in terms of differences between calculated / measured and in terms of the influences of the number of welding pass and heat input.

A Validated Numerical Model for Residual Stress Predictions in an Eight-Pass-Welded Stainless Steel Plate

2014 ◽  
Vol 777 ◽  
pp. 46-51 ◽  
Author(s):  
Vipulkumar I. Patel ◽  
Ondrej Muránsky ◽  
Cory J. Hamelin ◽  
Mitch D. Olson ◽  
Michael R. Hill ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Stress Field ◽  
Steel Plate ◽  
Fe Analysis ◽  
Contour Method ◽  
Stainless Steel Plate ◽  
Residual Stress Field ◽  
Longitudinal Residual Stress ◽  
Welding Processes

Welding processes create a complex transient state of temperature that results in post-weld residual stresses. The current work presents a finite element (FE) analysis of the residual stress distribution in an eight-pass slot weld, conducted using a 316L austenitic stainless steel plate with 308L stainless steel filler metal. A thermal FE model is used to calibrate the transient thermal profile applied during the welding process. Time-resolved body heat flux data from this model is then used in a mechanical FE analysis to predict the resultant post-weld residual stress field. The mechanical analysis made use of the Lemaitre-Chaboche mixed isotropic-kinematic work-hardening model to accurately capture the constitutive response of the 316L weldment during the simulated multi-pass weld process, which results in an applied cyclic thermo-mechanical loading. The analysis is validated by contour method measurements performed on a representative weld specimen. Reasonable agreement between the predicted longitudinal residual stress field and contour measurement is observed, giving confidence in the results of measurements and FE weld model presented.

Analytical Evaluation of Weld Residual Stress Distribution for BWR Pipings

2008 ◽  
Author(s):  
M. Ando ◽  
K. Nakata ◽  
R. Sumiya ◽  
M. Itow ◽  
N. Tanaka
Keyword(s):  
Heat Transfer ◽  
Residual Stress ◽  
Stainless Steel ◽  
Material Properties ◽  
Fem Analysis ◽  
Residual Stress Distribution ◽  
Temperature History ◽  
Stress Distributions ◽  
Weld Residual Stress ◽  
Stress Analyses

SCC (stress corrosion cracking) of low-carbon stainless steel piping has been found in Japanese BWR plants since 2002. According to JSME Fitness-for-Service Code, flaw evaluations are required to verify the life-time of piping if SCC is detected. In order to evaluate the SCC propagation behavior, it is necessary to obtain the residual stress distribution through the thickness of piping. In this study, the mock-up PLR (Primary Loop Recirculation system) piping weld joints made of L-grade Type 316 stainless steel with 300 mm and 600 mm diameter were fabricated and residual stress analyses were performed in order to obtain stress distributions. Material properties (specific heat, thermal conductivity, Young’s modulus, stress-strain curve, etc.) were obtained and temperature history during welding and weld residual stress were measured using these mock-ups. Material properties were used in the heat transfer and stress analyses. Measured temperature history and residual stress were compared with the results of heat transfer and stress analyses, respectively. Residual stress analysis of the pipe weld joint is commonly performed using axisymmetric element. In some cases of the combination of pipe diameter and thickness, residual stress obtained by the conventional method might differ from the experimental result owing to the difference of heating and constraint conditions between the axisymmetric model and the actual condition. In order to obtain more precise results, heat transfer and stress analyses were performed, taking into account the adjustment of the boundary condition in the weld passes of the last layer and the constraint condition using a spring element, respectively. On the outer and inner surfaces, almost the same residual stress distributions were obtained for the FEM analysis and the measurement. The residual stress distributions for PLR piping with different diameters, thicknesses, welding processes and groove angles were obtained by FEM analysis. Based on the results of the analyses, the influences of these parameters on residual stress were evaluated.

Measurement and Prediction of the Residual Stress Field in an Autogenously Welded Stainless Steel Plate

2008 ◽  
Author(s):  
Hassan Alizadeh ◽  
Simon J. Lewis ◽  
Christopher Gill ◽  
S. Hossain ◽  
David J. Smith ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Residual Stresses ◽  
Test Specimen ◽  
Steel Plate ◽  
Measurement Techniques ◽  
Lessons Learned ◽  
Analytical Models ◽  
Stainless Steel Plate ◽  
Numerical Predictions

There has been a concerted effort over recent years to develop and refine finite element models of welds in order to predict residual stresses. These residual stresses are required to ever improved accuracies in order to provide continued confidence in the safe operation of ageing plant. Not only have computing hardware and software developed at a rapid rate, but guidelines for weld modelling ‘best practice’ have started to be documented. In order to validate and verify weld modelling procedures, test specimens are required which may be subjected to a suite of residual stress measurement techniques in order to allow comparison and ‘benchmarking’ of the numerical predictions. An abundance of such test specimens have been developed over the last few years. These are typically studied via large multi-national ‘round robins’ and results used to fine tune methodologies. A specific example is the NeT ‘bead on plate’ specimen [1, 2] which considered a single weld bead on an austenitic stainless steel plate. Whilst the major thrust worldwide now is to fabricate and study test specimens more representative of real plant, by considering larger specimens, many weld passes, different materials (including ferritic steels and their associated phase change during welding), the research presented in this paper considers an even simpler test specimen. Thus, an autogenous (no filler material) weld on a stainless steel plate is considered. There were two principal motivations for this work. Firstly, numerical and experimental results were required to validate analytical models of welding induced residual stresses. These analytical models [3] are currently under development but, to date, have been formulated only for parent material. Secondly, the lessons learned on weld modelling from previous studies were desired to be tested on the simplest test specimen available.

Finite Element Analysis of the Effect of Brazed Residual Stress on Creep for Stainless Steel Plate-Fin Structure

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Wen-Chun Jiang ◽  
Jian-Ming Gong ◽  
Hu Chen ◽  
S. T. Tu
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Stress Distribution ◽  
Steel Plate ◽  
Operating Pressure ◽  
Stainless Steel Plate ◽  
Element Analysis ◽  
Creep Analysis

This paper presented a finite element analysis of the effect of brazed residual stress on creep for stainless steel plate-fin structure using finite element code ABAQUS. The as-brazed residual stress distribution generated during the brazing process was obtained. Two cases, which are denoted Cases 1 and 2, were analyzed and compared to discuss the effect of as-brazed residual stress on creep. Case 1 was to carry out creep analysis just at the internal operating pressure. Case 2 was to perform the creep analysis considering the internal operating pressure in conjunction with as-brazed residual stress. The results show that due to the mechanical property mismatch between filler metal and base metal, large residual stress is generated in the brazed joint, which has a great influence on creep for stainless steel plate-fin structure. The creep strain and stress distribution of the overall plate-fin structure is obtained. The position that is most likely to fail is the fillet for the plate-fin structure at high temperature. Especially in the fillet interface, the creep strain and stress distribution are discontinuous and uncoordinated, which have great effect on creep failure.

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