Sensitivity analysis and optimization of thermo-elasto-plastic processes with applications to welding side heater design

Song, Jung Han; Shanghvi, J. Y.; Michaleris, P.

doi:10.1016/j.cma.2004.03.007

Cited by 43 publications

(24 citation statements)

References 20 publications

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“…A study in which design variables are optimized to obtain minimum welding residual stresses can be found in [11]. Let us mention [12,13] whose results tend to show that for the studied cases the distortions are mostly affected by thermal expansion and, to a lesser extent, by Young's modulus and yield strength.…”

Section: Introductionmentioning

confidence: 99%

Global sensitivity analysis in welding simulations—What are the material data you really need?

Asserin

Loredo

Petelet

et al. 2011

Finite Elements in Analysis and Design

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Section: Introductionmentioning

confidence: 99%

Global sensitivity analysis in welding simulations—What are the material data you really need?

Asserin

Loredo

Petelet

et al. 2011

Finite Elements in Analysis and Design

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“…One of the techniques is to apply a transient thermal tension by side heaters [25]. The distortion comes from a high gradient of temperature from the welding to the side and in high conductive materials such as Aluminium, a side heating lessens the gradient as well as this technique introduces a significant tension around the weld.…”

Section: Mitigation Techniquementioning

confidence: 99%

An Integrated Computational Welding Mechanics With Direct-Search Optimization for Mitigation of Distortion in an Aluminum Bar Using Side Heating

Asadi

Goldak

2013

Journal of Manufacturing Science and Engineering

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Using a computational weld mechanics (CWM) frame-work for exploring a design space, a recent direct-search algorithm from Kolda, Lewis and Torczon is modified to use a least-square approximation to improve the method of following a path to the minimum in the algorithm. To compare the original and modified algorithms, a CWM optimization problem on a 152 x 7.220 x 12.5 mm bar of Aluminum 5052-H32 to minimize the weld distortion mitigated by a side heating technique is solved. The CWM optimization problem is to find the best point in the space of side heater design parameters: power, heated area, longitudinal and transverse distance from the weld such that the final distortion is as low as possible (minimized). This CWM optimization problem is constrained to keep the stress level generated by the side heaters, in the elastic region to avoid adding an additional permanent plastic strain to the bar. The number of iterations, size of design of experiments (DOE) matrix required and CPU time to find the minimum for the two algorithms are compared.

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“…where C is the temperature-dependent elastic constitutive matrix, while for thermo-elasto-plastic problems at small strains [11] the relation σ = C ε e = C (ε − ε p − ε th ) (7) has been used, where ε e and ε p represents the elastic and plastic strains, respectively. Thus, the use of nonlinear materials require the more general expression:…”

Section: Basic Equationsmentioning

confidence: 99%

Tracing nonlinear equilibrium paths of structures subjected to thermal loading

Parente

Afonso

2005

Comput Mech

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This work presents numerical methods for path tracing and nonlinear stability analysis, including critical point computation and branch-switching, of structures subjected to thermal loading. The differences between the thermal loading case and the standard case of mechanical loading are addressed from both conceptual and computational standpoints. The implementation of the presented methods in a nonlinear finite element system originally designed to deal with mechanical loading is discussed in detail. The techniques presented here are validated by numerical examples.

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Sensitivity analysis and optimization of thermo-elasto-plastic processes with applications to welding side heater design

Cited by 43 publications

References 20 publications

Global sensitivity analysis in welding simulations—What are the material data you really need?

Global sensitivity analysis in welding simulations—What are the material data you really need?

An Integrated Computational Welding Mechanics With Direct-Search Optimization for Mitigation of Distortion in an Aluminum Bar Using Side Heating

Tracing nonlinear equilibrium paths of structures subjected to thermal loading

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