Numerical prediction of temperature distribution and residual stresses on plasma arc welded thin titanium sheets

Arunkumar, M.; Dhinakaran, V.; Shanmugam, N. Siva

doi:10.1080/02286203.2019.1700089

Cited by 20 publications

(5 citation statements)

References 22 publications

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“…Convective and radiative heat transfer mechanisms influence the temperature field of the exposed extrudate and print bed surfaces, Ω Conv+Rad , and are applied using Neumann boundary conditions. The integration of radiative heat transfer into commercial FEM software, such as ANSYS Workbench 2021 R2, is challenging when using the 'elementbirth-and-death' technique and requires a modification of the convective heat transfer coefficient to include the effects of radiative heat transfer [23,24]. The combined heat transfer coefficient h Tot [W/ m 2 K ] is composed of the convective heat transfer coefficient h Conv [W/ m 2 K ], based on Newton's law of cooling, and the radiative heat transfer coefficient h Rad [W/ m 2 K ], derived from the Stefan-Boltzmann law [24].…”

Section: Thermal Simulation Of Ls-mexmentioning

confidence: 99%

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Leubecher,

Brier,

Vitale

et al. 2024

Materials

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Large-Scale Material Extrusion (LS-MEX) is increasingly being used in small-scale production and prototyping due to its ability to create components in new temporal and spatial dimensions. However, the use of this manufacturing process poses microscopic and macroscopic challenges not encountered in previous small-scale production systems. These challenges arise primarily from the prolonged retention of heat in the material, which leads to insufficient strength in the extruded strands at the macrostructural level. As a result, the component can collapse, a phenomenon known as ‘slumping’. Thermal energy also influences microstructural changes, such as crystallisation kinetics, which affect properties such as the strength and stiffness of the final product. The duration and dynamics of thermal energy are influenced by manufacturing parameters and the possible use of additional peripheral equipment, which affects component quality. In this study, the influence of thermal energy on structural processes through simulations of polyamide 6 with 40% carbon fibres (PA6 wt.%40 CF) is investigated. The results show that by adjusting the process parameters and using modification units, the thermal profile of the material can be accurately controlled, which allows the microstructural processes to be precisely controlled. This leads to the targeted modification of the macroscopic material properties. The focus of this work is on the combination of numerical simulations of the LS-MEX process with semi-empirical methods for the analysis of crystallisation processes. The application of the Nakamura model, which is used throughout similar investigations, allows a detailed description and prediction of the crystallisation kinetics during the manufacturing process. The study shows that the absolute degree of crystallisation can be determined with simplified assumptions using a combination of thermal simulations and semi-empirical approaches. It was found that the absolute degree of crystallisation increases from the outer interface of the strand to the print bed across the cross-section. This can be attributed to the specific thermal boundary conditions and the resulting temperature profiles at different points.

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Section: Thermal Simulation Of Ls-mexmentioning

confidence: 99%

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Leubecher,

Brier,

Vitale

et al. 2024

Materials

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“…Welding heat conduction is a typical nonlinear transient problem [6]. for a homogeneous and isotropic continuum medium, the control equation based on energy conservation is obtained as follows:…”

Section: Governing Equationmentioning

confidence: 99%

Low Temperature Welding Test and Numerical Simulation of Metallurgical Phase Transformation of Q460GJC Thick Plate

Li,

Wang,

et al. 2023

Archives of Metallurgy and Materials

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Low TemperaTure weLding TesT and numericaL simuLaTion of meTaLLurgicaL phase TransformaTion of Q460gJc Thick pLaTeThis paper conducts low temperature welding tests on Q460gJC thick plate (60 mm), and based on the basic theory of phase transformation structure evolution, a three-dimensional microstructure evolution analysis method for large welded joints is established, and the analysis of the evolution process of multi-layer and multi-pass weld structure under the low temperature environment of thick plates is completed. The comparison and analysis of test and numerical simulation results are in good agreement, which proves that the welding phase transformation model realizes the digitalization of metallurgical phase transformation in steel structure welding, and optimizes welding process parameters. it is of great significance to improve the quality of welding products and lay a foundation for predicting the performance of welded joints from the micro level.

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“…Two different mathematical expressions are used to describe the temperature fields of filler and base metal. Filler's temperature (in • C) starts from its peak and decreases during solidification, the difference between material and environment temperatures halves every 10 seconds [2]:…”

Section: Parametrisation Of the F0-field By Fem Simulationmentioning

confidence: 99%

Combined experimental/theoretical approach to residual stresses within multiplicative elasto-plasticity

Tagiltsev¹,

Shutov²

2021

Preprint

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The study is devoted to geometrically non-linear modelling of viscoplastic structures with residual stresses. We advocate and develop a special approach to residual stresses based on the transition between reference configurations. The finite strain kinematics of the viscoplastic material is modelled by the multiplicative decomposition of the deformation gradient tensor. Numerical algorithms originally developed for unstressed materials are extended to materials with pre-stresses. Owing to the weak invariance of constitutive equations, the incorporation of pre-stresses happens without additional costs. Thus, the advocated approach is especially efficient. A novel experimental/theoretical method for assessment of residual stresses in welded structures is presented; the method combines advantages of purely experimental and theoretical approaches. To demonstrate the applicability of the proposed procedure, we simulate plate welding. As an example we show that the procedure allows to extrapolate the filed of residual stresses away from the measurement points.As another example, we address the reduction of weldment-related residual stresses by mechanical treatment.

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Numerical prediction of temperature distribution and residual stresses on plasma arc welded thin titanium sheets

Cited by 20 publications

References 22 publications

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Crystallisation Dynamics in Large-Scale Extrusion Additive Manufacturing: An Analysis with and without Temperature Modification

Low Temperature Welding Test and Numerical Simulation of Metallurgical Phase Transformation of Q460GJC Thick Plate

Combined experimental/theoretical approach to residual stresses within multiplicative elasto-plasticity

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