Modelling of a Stud Arc Welding Joint for Temperature Field, Microstructure Evolution and Residual Stress

2016 ◽  
Author(s):  
Hadi Soltanzadeh ◽  
Jörg Hildebrand ◽  
Matthias Kraus ◽  
Mahyar Asadi
Keyword(s):  
Residual Stress ◽  
Material Properties ◽  
Main Concern ◽  
Temperature Dependent ◽  
Thermomechanical Model ◽  
Stress Calculation ◽  
Stud Welding ◽  
Microstructure Model ◽  
Transient Thermal ◽  
Welding Processes

This paper presents a modelling study and analysis performed on a stud welding including thermal, microstructure and stress calculation. The main concern of this work is toward controlling undesirable residual stresses and the evolution of material properties, as well as the chance of estimating cracks especially with regard to future services of structures. Historically, prediction of welding features is being pursued by welding engineers to enable them for optimal design and mitigation of adverse effects. Stud welding is among the welding processes that are not often addressed by means of modelling and associated activities to develop a comprehensive valid prediction. The aim of this research is to present a modelling practice for a stud weld joint to capture the transient thermal profile, consequent evolution of microstructural phase fractions, and stress calculation using a thermomechanical model based on FE methods (SYSWELD package). The material properties are fed into the model as temperature dependent. The microstructure model is based on t8/5 cooling trajectory on CCT diagram that captures transformation from Austenite phase, and the residual stress calculation is compared to experimental measurement for the sake of validation.

Nonlinear Transient Thermal Stress Analysis of Temperature-Dependent Hollow Cylinders Using a Finite Element Model

2014 ◽  
Vol 14 (07) ◽  
pp. 1450025 ◽  
Author(s):  
Ashraf M. Zenkour ◽  
Ibrahim A. Abbas
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Material Properties ◽  
Temperature Dependency ◽  
Temperature Dependent ◽  
Thermal Stress Analysis ◽  
Nonlinear Transient ◽  
Hollow Cylinders ◽  
Transient Thermal

In this paper, the nonlinear transient thermal stress analysis is conducted for temperature-dependent hollow cylinders subjected to a decaying-with-time thermal field. By the finite element method, the highly nonlinear governing equations are solved. The time histories of temperature, displacement, and stress due to the decaying-with-time thermal load are computed. A sensitivity analysis includes the effects of exponent of the decayed heat flux and temperature-dependency of density and material properties is carried out. Numerical results show some interesting characteristics of the thermoelastic behaviors of the hollow cylinders studied. In particular, the effect of temperature-dependency of the material properties on the thermoelastic parameters was demonstrated to be significant.

Residual Stress Simulation of Stud Welding in a Rectangular Steel Tubular Surface

2010 ◽  
Vol 44-47 ◽  
pp. 581-585
Author(s):  
Lei Wang ◽  
Qi Lin Zhang ◽  
Lu Chen
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Thermal Stresses ◽  
Three Dimensional ◽  
Element Model ◽  
Stud Welding ◽  
Tubular Surface ◽  
Three Dimensional Models ◽  
Transient Thermal ◽  
Stress Simulation

A thermal-mechanical coupled finite element model has been presented to predict residual and thermal stresses during different stages of stud welding. The finite study was carried out using three-dimensional models. To enhance the accuracy of the numerical solution material properties including physical, thermal and mechanical properties supposed to be temperature-dependent. After the temperature distributions as a result of welding were calculated, thermal and residual stress values obtained. Residual stresses are attributed to the elasto-plastic response of the object towards the transient thermal stresses generated by the welding. After all temperature values reach the room temperature, the residual stresses decrease to a small value.

Residual Stress Measurement in Innovative Friction Stir Welding Processes

2017 ◽  
Vol 754 ◽  
pp. 391-394
Author(s):  
D. Campanella ◽  
C. Casavola ◽  
A. Cazzato ◽  
Livan Fratini ◽  
V. Moramarco ◽  
...  
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Friction Stir Welding ◽  
Material Properties ◽  
Stress Measurement ◽  
Residual Stress Distribution ◽  
Butt Joints ◽  
Welded Structures ◽  
Friction Stir ◽  
Welding Processes

In recent years, important innovations have been introduced in Friction Stir Welding (FSW) technology such as, for example, the Laser assisted Friction Stir Welding (LFSW) and in-process Cooled Friction Stir Welding (CFSW). Residual stresses have a fundamental role in welded structures because they affect the way to design the structures, fatigue life, corrosion resistance and many other material properties. Consequently, it is important to investigate the residual stress distribution in FSW where, though the heat input is lower compared to traditional welding techniques, the constraints applied to the parts to weld are more severe. The aim of the present work is to verify the capabilities of both FSW techniques in reduction of the residual stress in aluminium butt joints.

scholarly journals Residual Stress Analysis of an Orthotropic Composite Cylinder under Thermal Loading and Unloading

Symmetry ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 320 ◽  
Author(s):  
Somayeh Zarandi ◽  
Hsiang-Wei Lai ◽  
Yun-Che Wang ◽  
Sergey Aizikovich
Keyword(s):  
Residual Stress ◽  
Material Properties ◽  
Thermal Loading ◽  
Outer Boundary ◽  
Elastic Inclusion ◽  
Internal Stresses ◽  
Stress Distributions ◽  
Composite Cylinder ◽  
Temperature Dependent ◽  
Anisotropic Plasticity

Elastoplastic analysis of a composite cylinder, consisting of an isotropic elastic inclusion surrounded by orthotropic matrix, is conducted via numerical parametric studies for examining its residual stress under thermal cycles. The matrix is assumed to be elastically and plastically orthotropic, and all of its material properties are temperature-dependent (TD). The Hill’s anisotropic plasticity material model is adopted. The interface between the inclusion and matrix is perfectly bonded, and the outer boundary of the cylinder is fully constrained. A quasi-static, uniform temperature field is applied to the cylinder, which is analyzed under the plane-strain assumption. The mechanical responses of the composite cylinder are strongly affected by the material symmetry and temperature-dependent material properties. When the temperature-independent material properties are assumed, larger internal stresses at the loading phase are predicted. Furthermore, considering only yield stress being temperature dependent may be insufficient since other TD material parameters may also affect the stress distributions. In addition, plastic orthotropy inducing preferential yielding along certain directions leads to complex residual stress distributions when material properties are temperature-dependent.

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