Strain and stress conditions at crack initiation during shearing of medium- and high-strength steel sheet
Number of Authors: 4
2017 (English)In: International Journal of Manufacturing, Materials, and Mechanical Engineering, ISSN 2156-1680, E-ISSN 2156-1672, Vol. 12, no 1, 10Article in journal (Refereed) Published
Strain and stress conditions in sheet metal shearing are of interest for calibration of various fracture criteria. Most fracture criteria are governed by effective strain and stress triaxiality.
This work is an attempt to extend previous measurements of strain fields in shearing of steel sheets with the stress state calculated from the measured displacement fields. Results are presented in terms of von Mises stress and stress triaxiality fields, and a comparison was made with finite element simulations. Also, an evaluation of the similarities of the stress conditions on the sheet surface and inside the bulk material was presented.
Strains and von Mises stresses were similar to the surface and the bulk material, but the stress triaxiality was not comparable. There were large gradients in strain and stress around the curved tool profiles that made the result resolution dependent and comparisons of maximum strain and stress values difficult.
The stress state on the sheet surface calculated from displacement field measurements is useful for validation of a three-dimensional finite element model.
Place, publisher, year, edition, pages
2017. Vol. 12, no 1, 10
Research subject Solid Mechanics
IdentifiersURN: urn:nbn:se:ltu:diva-62546DOI: 10.1186/s40712-017-0075-5OAI: oai:DiVA.org:ltu-62546DiVA: diva2:1082625
Validerad; 2017; Nivå 1; 2017-03-17 (andbra)2017-03-172017-03-172017-03-17Bibliographically approved