Finite element modeling of residual stresses in machining induced by cutting using a tool with finite edge radius

Numerical simulation of the forging process

Three-dimensional thermo-elastic–plastic finite element modeling of quenching process of plain-carbon steel in couple with phase transformation

http://www.mate.tue.nl/mate/pdfs/4148.pdf

Evaluation of a fictitious domain method for predicting dynamic response of mechanical heart valves

Extrusion of 7075 aluminium alloy through double-pocket dies to manufacture a complex profile

In the present study, a hexahedral mesh generator was developed for remeshing in three-dimensional metal forming simulations. It is based on the master grid approach and octree-based refinement scheme to generate uniformly sized or locally refined hexahedral mesh system. In particular, for refined hexahedral mesh generation, the modified Laplacian mesh smoothing scheme mentioned in the two-dimensional study (Part I) was used to improve the mesh quality while also minimizing the loss of element size conditions. In order to investigate the applicability and effectiveness of the developed hexahedral mesh generator, several three-dimensional metal forming simulations were carried out using uniformly sized hexahedral mesh systems. Also, a comparative study of indentation analyses was conducted to check the computational efficiency of locally refined hexahedral mesh systems. In particular, for specification of refinement conditions, distributions of effective strain-rate gradient and posteriori error values based on a Z2 error estimator were used. From this study, it is construed that the developed hexahedral mesh generator can be effectively used for three-dimensional metal forming simulations. Copyright © 2002 John Wiley & Sons, Ltd.

Remeshing for metal forming simulations—Part II: Three‐dimensional hexahedral mesh generation

In this paper, a general framework of practical two-dimensional quadrilateral remeshing, which includes the determination of remeshing time, automatic quadrilateral mesh generation, and data transfer process, will be formulated. In particular, the current work contains new algorithms of mesh density specification according to the distribution of effective strain-rate gradients, mesh density smoothing by fast Fourier transform (FFT) and low-pass filtering techniques, coarsening it by node placement scheme, and a modified Laplacian mesh smoothing technique. The efficiency of the developed remeshing scheme was tested through three practical two-dimensional metal forming simulations. The results clearly indicate that the algorithms proposed in this study make it possible to simulate two-dimensional metal forming problems efficiently and automatically. Copyright © 2002 John Wiley & Sons, Ltd.

Remeshing for metal forming simulations—Part I: Two‐dimensional quadrilateral remeshing

Simulation of clutch-hub forging process using CAMPform

In recent years, demand for three-dimensional simulations has continued to grow in the field of computer-aided engineering. Especially, in the analysis of forming processes a fully automatic and robust mesh generator is necessary for handling complex geometries used in industry. For three-dimensional analyses, tetrahedral elements are commonly used due to the advantage in dealing with such geometries. In this study, the advancing front technique has been implemented and modified using an optimization scheme. In this optimization scheme, the distortion metric determines ‘when and where’ to smooth, and serves as an objective function. As a result, the performance of the advancing front technique is improved in terms of mesh quality generated. Copyright © 2003 John Wiley & Sons, Ltd.

Dae-Young Kwak

Papers

Remeshing for metal forming simulations—Part II: Three‐dimensional hexahedral mesh generation

Remeshing for metal forming simulations—Part I: Two‐dimensional quadrilateral remeshing

Simulation of clutch-hub forging process using CAMPform

Tetrahedral mesh generation based on advancing front technique and optimization scheme

Analysis and design of flat-die hot extrusion process - 1. Three-dimensional finite element analysis