Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Yield criteria for incompressible materials in the shear stress space
 Öchsner, A.: Experimental and numerical investigation of advanced materials and structures : 6th International Conference on Advanced Computational Engineering and Experimenting, ACEX 2012, was held in Istanbul, Turkey, from 1 to 4 July, 2012; Revised and extended research articles Cham: Springer International Publishing, 2013 (Advanced structured materials 41) ISBN: 9783319005058 (Print) ISBN: 9783319005065 (Online) pp.107119 
 International Conference on Advanced Computational Engineering and Experimenting (ACEX) <6, 2012, Istanbul> 

 English 
 Conference Paper 
 Fraunhofer LBF () 
 flow criteria; equivalent stress; deviatoric plane; generalization 
Abstract
In the theory of plasticity different yield criteria for incompressible material behavior are used. The criteria of Tresca, von Mises and SchmidtIshlinsky are well known and the first two are presented in the textbooks of Strength of Materials. Both Tresca and SchmidtIshlinsky criteria have a hexagonal symmetry and the criterion of von Mises has a rotational symmetry in the πplane. These criteria do not distinguish between tension and compression (no strength differential effect), but numerous problems are treated in the engineering practice using these criteria. In this paper the yield criteria with hexagonal symmetry for incompressible material behavior are compared. For this purpose, their geometries in the πplane will be presented in polar coordinates. The radii at the angles of 15∘ and 30∘ will be related to the radius at 0∘. Based on these two relations, these and other known criteria will be shown in one diagram. In this diagram the extreme shapes of the yield surfaces are restricted by two criteria: the Unified Yield Criterion (UYC) and the Multiplicative Ansatz Criterion (MAC). The models with hexagonal symmetry in the πplane for incompressible materials can be formulated in the shear stress space. For this formulation platonic, archimedean and catalan solids with orthogonal symmetry planes are used. The geometrical relations of such models in the πplane will be depicted in the above mentioned diagram. The examination of the yield surfaces leads to the generalized criterion with two parameters. This model describes all possible convex forms with hexagonal symmetry. The proposed way to look at the yield criteria simplifies the selection of a proper criterion. The extreme solutions for the analysis of structural members can be found using these criteria.