Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile testsReportar como inadecuado




Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 ESSTT - Ecole Supérieure de Science et Technique de Tunis 2 LGP - Laboratoire Génie de Production

Abstract : The aim of the presented investigations is to perform an analysis of fracture and instability during simple and complex load testing by addressing the influence of ductile damage evolution in necking processes. In this context, an improved experimental methodology was developed and successfully used to evaluate localization of deformation during uniaxial and biaxial tensile tests. The biaxial tensile tests are carried out using cruciform specimen loaded using a biaxial testing machine. In this experimental investigation, Stereo-Image Correlation technique has is used to produce the heterogeneous deformations map within the specimen surface. Scanning electron microscope is used to evaluate the fracture mechanism and the micro-voids growth. A finite element model of uniaxial and biaxial tensile tests are developed, where a ductile damage model Gurson-Tvergaard-Needleman GTN is used to describe material deformation involving d-amage evolution. Comparison between the experimental and the simulation results show the accuracy of the finite element model to predict the instability phenomenon. The advanced measurement techniques contribute to understand better the ductile fracture mechanism.

Keywords : Tensile test Fractography Numerical modeling Damage model Necking Microvoid growth





Autor: Fethi Abbassi - Sebastien Mistou - Ali Zghal -

Fuente: https://hal.archives-ouvertes.fr/



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