An Inverse Finite Element Method for the Analysis of Stationary Arc Welding Processes

1986 ◽  
Vol 108 (4) ◽  
pp. 734-741 ◽  
Author(s):  
Y. F. Hsu ◽  
B. Rubinsky ◽  
K. Mahin
Keyword(s):  
Finite Element ◽  
Arc Welding ◽  
Computer Code ◽  
Transient Temperature ◽  
Work Piece ◽  
Transient Temperature Distribution ◽  
Interpolation Procedure ◽  
Solid Region ◽  
Solid Liquid Interface ◽  
Welding Processes

An inverse finite element computer code was developed to facilitate the experimental analysis of two-dimensional stationary arc welding processes. The method uses transient temperature data from thermocouples imbedded in the solid region of the work piece to determine through a Newton–Raphson interpolation procedure the transient position of the solid–liquid interface and the transient temperature distribution in the solid region of the work piece. The accuracy of the method was demonstrated through comparison with results obtained with a direct finite element code and through comparison with experiments.

Temperature Profiles in a Finite Element Thermal Model of the Prostate Region Under Hyperthermia Treatment

1990 ◽  
Vol 189 ◽  
Author(s):  
Indira Chatterjee ◽  
Roy E. Adams ◽  
Namdar Saniei
Keyword(s):  
Finite Element ◽  
Phased Array ◽  
Blood Perfusion ◽  
Element Model ◽  
Bioheat Transfer ◽  
Transient Temperature ◽  
Temperature Profiles ◽  
Hyperthermia Treatment ◽  
Finite Element Software ◽  
Transient Temperature Distribution

ABSTRACTThe detailed transient temperature distribution in an inhomogeneous model of a cross section through the prostate region of the human body undergoing hyperthermia treatment forcancer has been calculated. The finite element method has been used to solve the bioheattransfer equation. A commercially available finite element software package called ANSYS® has been adapted to the present problem.The model consists of 523 triangular elements and incorporates a tumor in the prostate.The hyperthermia device under test is an Annular Phased Array consisting of dipole antennas. The model is surrounded by a bolus of deionized water. The calculated electromagnetic energy distribution is input into the bioheat transfer equation and the resulting temperature distributions calculated.The increase in blood perfusion rates due to heating is incorporated into the model. Detailed transient temperature profiles in the finite element model are presented for various values of blood perfusion rates in the tumor and surrounding tissues. It is observed that the Annular Phased Array is effective in raising the temperature of the tumor to therapeutic values.

Analytical and numerical investigations of weld bead shape in plasma arc welding of thin Ti-6al-4v sheets

SIMULATION ◽  
2017 ◽  
Vol 93 (12) ◽  
pp. 1123-1138 ◽  
Author(s):  
V Dhinakaran ◽  
N Siva Shanmugam ◽  
K Sankaranarayanasamy ◽  
R Rahul
Keyword(s):  
Finite Element ◽  
Heat Source ◽  
Analytical Model ◽  
Arc Welding ◽  
Thermal Cycle ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Element Simulation

In this research work, a new analytical model has been developed to predict the temperature distribution during plasma arc welding of thin Ti-6Al-4V sheets. Dhinakaran’s model based on a three-dimensional parabolic Gaussian heat source is considered as a plasma arc heat source moving on a semi-infinite body to derive the analytical model and the same heat source model is substituted in the three-dimensional Fourier’s law of heat conduction and implemented in the finite element package. Thermo physical properties, such as density, specific heat, and thermal conductivity, are used as temperature-dependent properties in finite element simulation. Numerical simulation is carried out using COMSOL. The new analytical model is expressed as a function of three-dimensional spatial co-ordinates and the time co-ordinate. A computer program has been written to solve the analytical model in order to obtain the distribution of transient temperature at any point of interest. The transient temperature distribution predicted by the analytical model has been compared with both the experimental result and the numerical result. Experimental work is carried out to measure the thermal cycle during welding. The thermal cycle is measured by using an infrared thermometer. Very good correlation has been obtained between the predicted transient temperature by analytical solution and the measured temperature, as well as the finite element simulation result. This provides a reliable alternative for using these analytical solutions in the future to obtain the thermal cycle, distortion, and thermal stress during plasma arc welding.

Large-scale finite element analysis of arc-welding processes

2006 ◽  
Vol 39 (13) ◽  
pp. 2869-2875 ◽  
Author(s):  
K Choi ◽  
W Kim ◽  
K Kim ◽  
S Im ◽  
C-M Kim ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Arc Welding ◽  
Large Scale ◽  
Element Analysis ◽  
Welding Processes

Residual Stresses in As-Welded Joints: Finite Element Modeling and Neutron Difraction Stress Measurements

2011 ◽  
Vol 488-489 ◽  
pp. 335-338 ◽  
Author(s):  
Claire Acevedo ◽  
Jean Marie Drezet ◽  
J. P. Lefebvre ◽  
Laurent D'Alvise ◽  
A. Nussbaumer
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Residual Stresses ◽  
Arc Welding ◽  
Analysis Method ◽  
Weld Joints ◽  
Stress Components ◽  
Bridge Joints ◽  
Nonlinear Transient ◽  
Welding Processes

This paper describes the numerical analysis method used to estimate welding induced residual stresses in K-shape tubular bridge joints. The knowledge of residual stress distribution is required to design the geometry of K-joints loaded under fatigue stresses. Numerical simulations are focused on the arc welding MAG process, generally used to weld joints in bridge construction. Thermo-mechanical analyses are performed in 3D using two finite element codes:ABAQUS® and MORFEO® . ABAQUS has the advantage to offer large analysis capabilities(nonlinear, transient, dynamic, etc.) whereas MORFEO is more dedicated to welding processes and offers the possibility to analyze crack propagation under fatigue loads. Computed residual stresses in the region surrounding the weld are compared with measured residual stresses in order to estimate the ability of the codes to reproduce these stresses. Position, orientation and magnitude of the highest residual stress components are discussed.

Numerical and Experimental Investigations on Deposition of Stainless Steel in Wire Arc Additive Manufacturing

2021 ◽  
Vol 11 (4) ◽  
pp. 40-56
Author(s):  
Ashish Kumar ◽  
Kuntal Maji
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Additive Manufacturing ◽  
Temperature Distribution ◽  
Wall Structure ◽  
Experimental Investigations ◽  
Transient Temperature ◽  
Element Analysis ◽  
Transient Temperature Distribution ◽  
Wire Arc Additive Manufacturing

This paper presents numerical and experimental investigations on wire arc additive manufacturing for deposition of 430L ferritic stainless steel. Finite element analysis was used to predict temperature distribution for deposition of multiple layers in wire arc additive manufacturing. The transient temperature distribution and predicted by finite element simulation was in good agreement with the experimental results. A wall type structure was fabricated by deposition of multiple layers vertically, and deposited material was characterized by tensile testing and microstructure study. The microstructure of the deposited wall structure was investigated through optical microscopy and scanning electron microscopy (SEM) with EDS. The microstructure of deposited material was changed from fine cellular grains structure to columnar dendrites structure with the formation of secondary arm. It was found that the YS, UTS, and EL of the deposition direction were better than the build direction. The mechanical properties of the WAAM manufactured material was found comparable to that of the wire metal.

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