A three-dimensional thermal finite element analysis of AISI 304 stainless steel and copper dissimilar weldment

2018 ◽  
Author(s):  
Gurdeep Singh ◽  
Ravindra K. Saxena ◽  
Sunil Pandey
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Element Analysis ◽  
Aisi 304

Finite Element Analysis of Residual Stresses in Butt Welding of Stainless Steel Plates by GTAW

2010 ◽  
Author(s):  
Gurinder Singh Brar ◽  
Rakesh Kumar
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Residual Stresses ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Element Analysis ◽  
Aisi 304 ◽  
Butt Welding

Welding is one of the most commonly used permanent joining processes in the piping and pressure vessel industry. During welding a very complex thermal cycle is applied to the weldment, which in turn causes irreversible elastic-plastic deformation and consequently gives rise to the residual stresses in and around fusion zone and heat affected zone (HAZ). Presence of residual stresses may be beneficial or harmful for the structural components depending on the nature and magnitude of stresses. The beneficial effect of compressive stresses have been widely used in industry as these are believed to increase fatigue strength of the component and reduce stress corrosion cracking and brittle fracture. In large steel fabrication industries such as shipbuilding, marine structures, aero-space industry, high speed train guide ways and pressure vessels and piping in chemical and petrochemical industry the problem of residual stresses and overall distortion has been and continue to be a major issue. It is well established fact that material response of structural components is substantially affected by the residual stresses when subjected to thermal and structural loads. Due to these residual stresses produced in and around the weld zone the strength and life of the component is reduced. As AISI 304 stainless steel has excellent properties like better corrosion resistance, high ductility, excellent drawing, forming and spinning properties, so it is almost used in all types of application like chemical equipment, flatware utensils, coal hopper, kitchen sinks, marine equipment etc. But because of the problems of residual stresses during the time of welding it is very essential to understand the behavior and nature of AISI 304 stainless steel material. So in order to overcome all these problems a 3-dimensional finite element model is developed in a commercially available FEA code by drafting an approximate geometry of the butt welded joint and then the finite element analysis is performed, so that one can understand the complete nature of residual stresses in butt welding of AISI 304 stainless steel plate. In this paper, butt welding simulations were performed on two AISI 304 stainless steel plates by gas tungsten arc welding (GTAW). Analysis of butt welded joint by commercially available finite element analysis code showed that butt weld produced by GTAW resulted in 782.84 MPa of residual stress in plates. In addition, the residual stress is plotted against axial distance to have a clear picture of the magnitude of residual stress in and around weld area.

Plastic Zone around a Fatigue Crack Determined by the FEM and a Nanoindentation Technique

2015 ◽  
Vol 662 ◽  
pp. 69-72
Author(s):  
Aleš Materna ◽  
Jan Ondráček
Keyword(s):  
Finite Element Analysis ◽  
Stainless Steel ◽  
Fatigue Crack ◽  
Plastic Zone ◽  
304 Stainless Steel ◽  
Constant Amplitude ◽  
Aisi 304 Stainless Steel ◽  
Element Analysis ◽  
Aisi 304 ◽  
The Finite Element Analysis

Plastic zone around a fatigue crack in AISI 304 stainless steel was studied experimentally using nanoindentation and numerically by the finite element analysis. Results obtained from one experimental observation of crack propagating under constant amplitude loading showed that nanohardness can be correlated to strain hardening caused by the cyclic deformation in the vicinity of the crack. However, for the material chosen for this study, exact plastic zone shape is hard to evaluate due to the scattering of experimental results.

Influence of Laser Parameters on Residual Stress Field of AISI 304 Stainless Steel Induced by Laser Peening: A Finite Element Analysis

2006 ◽  
Author(s):  
Xiang Ling ◽  
Weiwei Peng
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Stress Field ◽  
Stress Corrosion ◽  
Compressive Stress ◽  
304 Stainless Steel ◽  
Laser Peening ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304

The present paper established a non-linear elastic-plastic finite element method to predict the residual compressive stress distribution induced by Laser Peening (LP) in the AISI 304 stainless steel. The two dimensional FEA model considered the dynamic material properties at high strain rate (106/s) and the evaluation of loading conditions. Effects of laser power density, laser spot size, laser pulse duration, multiple LP processes and one/two-sided peening on the compressive stress field in the stainless steel were evaluated for the purpose of optimizing the process. Numerical results have a good agreement with the measurement values by X-ray diffraction method and also show that the magnitude of compressive stress induced by laser peening is greater than the tensile welding residual stress. So, laser peening is an effective method for protecting weldments against stress corrosion crack. The above results provide the basis for studying the mechanism on prevention of stress corrosion cracking in weld joint of type 304 stainless steel by laser peening.

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