Welding Metallurgy of

Three—dimensional dynamic finite element analysis of shot-peening induced residual stresses

3D FE analysis of peening of strain-rate sensitive materials using multiple impingement model

On the potential applications of a 3D random finite element model for the simulation of shot peening

https://www.shotpeener.com/library/pdf/2005058.pdf

A numerical simulation to relate the shot peening parameters to the induced residual stresses

Shot peening simulated by two different finite element formulations

Superplastic-like forming is a newly improved sheet forming process that combines the mechanical pre-forming (also called hot drawing) with gas-driven blow forming (gas forming). Non-superplastic grade aluminium alloy 5083 (AA5083) was successfully formed using this process. In this paper, a physical-based material model with dislocation density and vacancy concentration as intrinsic foundations was employed. The model describes the overall flow stress evolution of AA5083 from ambient temperature up to 550??C and strain rates from 10?4 up to 10?1?s?1. Experimental data in the form of stress?strain curves were used for the calibration of the model. The calibrated material model was implemented into simulation to model the macroscopic forming process. Hereby, finite element modelling (FEM) was used to estimate the optimum strain-rate forming path, and experiments were used to validate the model. In addition, the strain-rate controlled forming was conducted for the purpose of maintaining the gas forming with an average strain rate of 2???10?3?s?1. The predicted necking areas closely approximate the localized thinning observed in the part. Strain rate gradients as a result of geometric effects were considered to be the main reason accounting for thinning and plastic straining, which were demonstrated during hot drawing and gas forming by simulations.

https://iopscience.iop.org/article/10.1088/0965-0393/21/2/025006/pdf

Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083

Several advanced alloy systems are susceptible to weld solidification cracking. One example is nickel-based superalloys, which are commonly used in critical applications such as aerospace engines and nuclear power plants. Weld solidification cracking is often expensive to repair, and if not repaired, can lead to catastrophic failure. This study, presented in three papers, presents an approach for simulating weld solidification cracking applicable to large-scale components. The results from finite element simulation of welding are post-processed and combined with models of metallurgy, as well as the behavior of the liquid film between the grain boundaries, in order to estimate the risk of crack initiation. The first paper in this study describes the crack criterion for crack initiation in a grain boundary liquid film. The second paper describes the model required to compute the pressure and thickness of the liquid film required in the crack criterion. The third and final paper describes the application of the model to Varestraint tests of alloy 718. The derived model can fairly well predict crack locations, crack orientations, and crack widths for the Varestraint tests. The importance of liquid permeability and strain localization for the predicted crack susceptibility in Varestraint tests is shown.

/pdf/modeling-and-simulation-of-weld-solidification-cracking-part-2viaude6ut.pdf

Modeling and simulation of weld solidification cracking part III

Several advanced alloy systems are susceptible to weld solidification cracking. One example is nickel-based superalloys, which are commonly used in critical applications such as aerospace engines a ...

/pdf/modeling-and-simulation-of-weld-solidification-cracking-part-nyr7t2uyqi.pdf

Modeling and simulation of weld solidification cracking part II : A model for estimation of grain boundary liquid pressure in a columnar dendritic microstructure

/pdf/modeling-and-simulation-of-weld-solidification-cracking-part-1v462s1b2w.pdf

Jonas Edberg

Papers

Shot peening simulated by two different finite element formulations

Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083

Modeling and simulation of weld solidification cracking part III

Modeling and simulation of weld solidification cracking part II : A model for estimation of grain boundary liquid pressure in a columnar dendritic microstructure

Modeling and simulation of weld solidification cracking part I : A pore-based crack criterion