Holger Aretz

TL;DR: In this article, two convex formulations are proposed to describe the anisotropic behavior of metals and alloys for a full stress state (3D) in general terms, and the type of input data recommended for the description of plastic anisotropy in sheet samples is discussed.

TL;DR: In this article, two new yield functions for orthotropic sheet metals are proposed based on the established concept of multiple linear transformations of the stress deviator, which are able to account for planar and three-dimensional stress states.

TL;DR: In this article, the authors proposed a method for fitting the surface coordinates to an ellipsoid shape function to obtain the flow curve of the bulge test with optical measuring systems.

TL;DR: In this article, two non-quadratic orthotropic yield functions, Yld2011-18p and Yld 2011-27p, are proposed based on the concept of linear transformations operating on the stress deviator.

TL;DR: In this paper, the authors used the work hardening coefficient from the tensile test to approximate the same accuracy in stress-strain curves as obtained by optical measuring systems using the before mentioned evaluation method.