Institute of Fundamental Technological Research
Polish Academy of Sciences

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A. Bertram


Recent publications
1.  Schurig M., Bertram A., Petryk H., Micromechanical analysis of the development of a yield vertex in polycrystal plasticity, ACTA MECHANICA, ISSN: 0001-5970, DOI: 10.1007/s00707-007-0462-8, Vol.194, pp.141-158, 2007

Abstract:
The Taylor-Lin polycrystal model is used to simulate plastic deformations of a polycrystal. These propagate a corner in the subsequent yield surface due to the intersection of the yield loci of a number of slip mechanisms. Two approaches to identify subsequent yield surfaces and the development of the yield vertex at the applied stress are discussed. A linear regression analysis of the rounded corner is used to identify the corner angle and its development for different strain processes. On deformation paths composed of two aligned segments, the development of a secondary vertex is shown to follow similar laws.

Affiliations:
Schurig M. - other affiliation
Bertram A. - other affiliation
Petryk H. - IPPT PAN

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