Finite Element Analysis and Experimental Investigation of Sheet Metal Stretching

Abstract

The finite element method was used to obtain the stress and strain distributions in sheet metal on nonaxisymmetric flat punch heads in stretching. Displacement boundary conditions were assumed. The experimental investigation was carried out by stretching securely clamped grid blanks with suitable punch heads; boundary displacements and strains were obtained from the observed deformation pattern on punch heads. A comparison with an experiment in terms of effective strain and thickness strain distributions and strains along the longitudinal axis reveals excellent agreement. The finite element method was also applied to bore expanding in a circular plate. Strain distributions were obtained for two types of materials, one isotropic and the other material having thickness anisotropy. The results showed excellent agreement with exact solution and experimental results.

Stress Analysis on the Stretch Forming of the Aluminum Saddle-Shaped Skins

“…In view of this, quite a lot of scholars are involved in the relevant researches on sheet stretch forming. Among them, Metha and Kobayashi [3] employed both rigid finite element method and experiment to investigate the problem of non axis-symmetric sheet metal stretching. Then, Kim, Oh and Kobayashi [4] conducted an analysis on stretching of sheet metals with hemispherical punch via rigid finite element method, and K. Sigert et al [5] used FEM to predict the final properties of sheet metal parts which were formed with a CNC-controlled stretch forming machine.…”

Modelagem da estampagem profunda de chapas metálicas via o método dos elementos finitos associado ao critério de escoamento não-quadrático de Hill

“…Mehta e Kobayashi (1971) aplicaram o Método dos Elementos Finitos na análise elastoplástica não axissimétrica de uma chapa estirada com anisotropia normal.…”