Modelling of Failure in High Strength Steel Sheets
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
In this theses the high strength steel Docol 600DP and the ultra high strength steel Docol 1200M are studied. Constitutive laws and failure models are calibrated and veried by the use of experiments and numerical simulations. For the constitutive equations, an eight parameter high exponent yield surface has been adopted, representing the anisotropic behaviour, and a mixed isotropic-kinematic hardening has been used to capture non-linear strain paths.
For ductile sheet metals three dierent failure phenomena have been observed: (i) ductile fracture, (ii) shear fracture, and (iii) instability with localised necking. The models for describing the dierent failure types have been chosen with an attempt to use just a few tests in addition to these used for the constitutive model. In this work the ductile and shear fracture have been prescribed by models presented by Cockroft-Latham and Bressan-Williams, respectively. The instability phenomenon is described by the constitutive law and the nite element models. The results obtained are in general in good agreement with test results.
The thesis is divided into two main parts. The background, theoretical framework, mechanical experiments and nite element models are presented in the rst part. In the second part, two papers are appended.
Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. , 58 p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1529
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-77759Local ID: LIU-TEK-LIC-2012:14ISBN: 978-91-7519-895-5OAI: oai:DiVA.org:liu-77759DiVA: diva2:528964
2012-06-01, A39, Hus A, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Geir Lademo, Odd, Professor
Nilsson, Larsgunnar, Professor
List of papers