Finite element welding simulation of construction assembly

2021 ◽  
pp. 759-765
Author(s):  
M. Hashemzadeh ◽  
Y. Garbatov ◽  
C. Guedes Soares
Keyword(s):  
Finite Element ◽  
Welding Simulation ◽  
Finite Element Welding Simulation

scholarly journals In-Service Welding Simulation of 28” Pipeline Using Finite Element Method

2019 ◽  
Vol 694 ◽  
pp. 012028
Author(s):  
Sahrudin Tambunan ◽  
Ardiyansyah Yatim ◽  
Putu Wira Sanjaya ◽  
P H Michael Simon
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Welding Simulation ◽  
Element Method

scholarly journals Using Welding Simulation and Ultrasonic Method to Evaluate Residual Stress in Stainless Steel Welded Plates

2012 ◽  
Author(s):  
Yashar Javadi ◽  
Mohammadreza Hadizadeh Raeisi ◽  
Hamed Salimi Pirzaman ◽  
Mehdi Ahmadi Najafabadi
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Residual Stresses ◽  
Acoustic Waves ◽  
Stress Measurement ◽  
Bulk Material ◽  
Three Dimensional ◽  
Ultrasonic Waves ◽  
Welding Simulation

When a material is under mechanical load, the stresses change the velocity of acoustic waves because of acoustoelastic effect. This property can be employed for stress measurement in the material itself when the stress concerns the surface of the material, or in the bulk material. This technique involves with critically refracted longitudinal waves that propagate parallel to the surface, i. e. LCR waves. This paper presents a three dimensional thermo-mechanical analysis to evaluate welding residual stresses in plate-plate joint of AISI stainless steel 304L. After finite element simulation, the residual stresses were evaluated by LCR ultrasonic waves. This paper introduces a combination of “Finite Element Welding Simulation” and “Ultrasonic Stress Measurement using the LCR Wave” which is called as “FELcr”. The capabilities of FELCR in residual stress measurement are confirmed here. It has been shown that predicted residual stress from three dimensional FE analyses is in reasonable agreement with measured residual stress from LCR method.

Numerical Modeling and Initial Fatigue Life Estimations of Welded Structural Components

2014 ◽  
Vol 1029 ◽  
pp. 124-129
Author(s):  
Ivana Vasovic ◽  
Marko Ristic ◽  
Slavica Ristic ◽  
Mirko Maksimovic ◽  
Dragi Stamenkovic
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Residual Stresses ◽  
Numerical Simulations ◽  
Axial Direction ◽  
Element Model ◽  
Mechanical Analysis ◽  
Welding Simulation ◽  
Critical Areas ◽  
Good Agreement

Numerical simulations are powerful tool for analyzing and research in domain of mechanical constructions. In welded joints is very important to determine residual stresses and temperature distribution in sample, apropos, element of construction. In some cases doing the experiment is not possible, so numerical simulations can give the required results and overview of stress state, residual stresses, critical areas, displacement, temperature distribution and other data is needed for analyzing and improvement of constructions or parts of constructions. This analysis includes finite element model for the thermal and mechanical welding simulation. Welding simulation was considered as a sequential coupled thermo-mechanical analysis. The residual stress distribution and magnitude in axial direction was obtained. The paper also shows the results obtained in a simultaneously test of a butt welded thin steel sheet specimen by conventional methods and thermography. Numerical methods are also used in order to predict the crack of specimen. The obtained results confirm that it is very useful to use thermography and Finite Element Method (FEM) for early diagnostics of the complex structures in the exploitation conditions. In this paper is obtained good agreement of results between experiment and Numerical simulations.

scholarly journals Welding Simulation Used in the Design of Metallic Armor Systems

2014 ◽  
Vol 996 ◽  
pp. 518-524
Author(s):  
Lee Fredette ◽  
Elvin Beach
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Finite Element Simulation ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Welding Process ◽  
Welding Simulation ◽  
Finite Element Software ◽  
Element Simulation ◽  
Wide Range

Welding steel armor reduces the armor materials protection capability. Several industrial and military welding standards exist for welding armor materials with the primary focus on joint strength rather than ballistic integrity.The Heat Affected Zone (HAZ) created by the welding process introduces vulnerabilities in the protection system. The process and designs that we have demonstrated include mitigation features that eliminate the ballistic degradation and provide uniform protection across all armor materials.In this study we used finite element simulation of the welding process to perform trade studies evaluating welded joint designs, and to show how the designs could be altered to both optimize armor performance and reduce welding heat input. A beneficial effect of reduced heat input was the corresponding reduction in welding-induced residual stresses, an overall reduction in assembly distortion in the assembly, and improvement of the armor performance.The simulated welding process included the creation of the heat affected zone and the development of residual stresses in the structure. ABAQUS finite element software was used for the simulation with the aid of an extensive material property database created over the wide range of welding temperatures.The finite element simulation predictions were validated and verified with excellent results by metallography and micro-hardness measurements. Live-fire ballistic tests were used as the final proof of measurable design improvements. Finite element welding simulation was shown to be an effective tool for improving upon standard welded armor designs, and above all in improving human safety.

On the Performance of a Commercial Finite Element Code in Multi-Pass Welding Simulation

2004 ◽  
Author(s):  
Dimitrios Elias Katsareas ◽  
Carsten Ohms ◽  
Anastasius George Youtsos
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Power Plants ◽  
Computational Cost ◽  
Measurement Data ◽  
Ease Of Use ◽  
Model Complexity ◽  
Finite Element Code ◽  
Primary Coolant ◽  
Welding Simulation

Despite the development of a number of in-house finite element codes for welding simulation and residual stress prediction, industry focuses on commercial software due to their robustness, ease of use, better convergence characteristics and the fact that residual stress analysis procedures based on them can be readily transferred to industrial applications. In the present paper the ANSYS finite element code in conjunction with the “birth & death of elements” technique, is used for the analysis of dissimilar metal pipe welds, common in primary coolant piping of nuclear power plants. Multi-pass, double V, butt welds of welded panels are also investigated, in an attempt to evaluate the method and establish the degree of model detail and complexity necessary to obtain satisfactory results, which in turn will lead to a golden rule between computational cost and practically accurate predictions. In all the individual cases under investigation, predicted residual stress and/or strain fields are compared with measurement data obtained from the literature. It is deduced that the proposed method, applied through a commercial finite element code, is simple in implementation and cost effective regarding model complexity and analysis time. The accuracy of predicted residual stresses/strains, when compared to measurements, depends largely on the availability and accuracy of welding heat input data.

Annealing Models in Welding Simulation: Conservative and Non-Conservative Residual Stress Distributions

2010 ◽  
Author(s):  
Mike Keavey ◽  
Alison Mark ◽  
Hui Dai ◽  
Philip J. Withers
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Structural Integrity ◽  
Welding Process ◽  
Short Time Scale ◽  
Stress Distributions ◽  
Welding Simulation ◽  
Annealing Effects ◽  
Assessment Procedures ◽  
Integrity Assessments

The influence of residual stress on degradation mechanisms must be taken into account when performing structural integrity assessments. Conservative hypothetical distributions are often assumed, in which the maximum stress is equal to yield. Finite element simulation is now being used in an attempt to derive more realistic residual stress profiles for incorporation into assessment procedures. It is now possible to include self-annealing effects in finite element simulations of the welding process, whereby stresses in existing material in the immediate vicinity of a weld pass are relaxed locally on a very short time scale. Annealing models used in practice vary in sophistication from a simple erasure of strain hardening history at a particular temperature, through certain non-physical assumptions about temperature dependence, to phenomenological models based on the assumed kinetics of underlying microstructural processes. Even more sophisticated models based on thermodynamical principles have been proposed. The original incentive for developing such models was the hope that peak residual stress predictions within the weld and heat affected zone would be reduced, removing the need for over-conservative assumptions when performing structural integrity assessments. Preliminary 2-D results using a model developed by one of the authors, however, suggest that peak stresses predicted with annealing may actually be higher, the hypothesis being that it is compressive stresses that are relaxed during the welding cycle, and that the final tensile residual stresses are increased via the Bauschinger effect. This paper considers results from a further 3-D welding simulation and looks a little more closely at different annealing models. A number of different modelling approaches to annealing are described, together with the basic modelling parameters used to simulate a weld that has been the subject of various European round-robins, both theoretical and experimental. A brief overview of how a kinetics based model can be implemented in a finite element code is also presented. Predicted residual stress distributions are compared with each other and with neutron diffraction measurements and conclusions drawn.

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