Plastic Anisotropy In Sheet Metal Forming

Plast 15 1 1999 pp.

Plastic anisotropy in sheet metal forming.

Advances in anisotropy of plastic behaviour and formability of sheet metals. A stress points forming contours of plastic work of aluminum alloy sheet 6016 o compared with the yield loci. Finally the effect of plastic anisotropy on the puckering behavior in the spherical cup deep drawing process is investigated. Memorandumului 28 400114 cluj napoca romania.

For the first time testing methods for plastic anisotropy of round bars and tubes are included. This scalar quantity is used extensively as an indicator of the formability of recrystallized low carbon steel sheets. A general elasto plastic finite element formulation based on incremental deformation theory for planar anisotropy and its application to sheet metal forming int. The computer simulation of the sheet metal forming processes needs a quantitative description of the plastic anisotropy by the yield locus.

A general elasto plastic finite element formulation based on incremental deformation theory for planar anisotropy and its application to sheet metal forming int. More often however the type of plastic anisotropy is characterized by different strengths in different directions in the plane of the sheet as well which is called planar anisotropy. The numerical results are compared to experiments. Planar anisotropy if by performing experiments on the sheet it is found that the measured r value is unchanged with orientation the sheet is said to have planar anisotropy.

From the results of the finite element analysis it is shown that puckering behavior of sheet metal is largely affected by plastic anisotropy. Anisotropic one as accurately as possible 1 11. A profound survey is given of literature about yield criteria for anisotropic materials up to most recent developments and the calculation of forming limits of anisotropic sheet me tal. A large chapter is devoted to formability testing both for bulk metal and sheet metal forming.

The lankford coefficient also called lankford value r value or plastic strain ratio is a measure of the plastic anisotropy of a rolled sheet metal. Numerical analysis is carried out in order to investigate the influence of plastic anisotropy on sheet metal forming processes such as stretching and deep drawing. Plasticity 15 1999 35 67. It is shown that the neglect of the anisotropy in the simulations leads to inaccurate results.