Non-linear elastic characterisation of a high strength bainitic roller bearing steel
2013 (English)In: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 68, 1-15 p.Article in journal (Refereed) Published
A small but not negligible non-linear elastic behaviour was detected when investigating cyclic uniaxial push-pull experiments on a high strength bainitic steel. Cyclic torsion experiments led to the conclusion that the shear modulus was relatively constant. A non-linear elastic model was implemented where the bulk modulus was extended with a second order term related to the elastic dilatation and where the shear modulus was constant. The material presented a strength differential effect (SDE), with larger yield stress in compression than in tension. Consequently, the non-linear elastic model was combined with a plasticity model that incorporated a Drucker-Prager yield surface, non-associated flow rule and combined non-linear hardening. Expressions that include non-linear elasticity were derived for the elastic-plastic hardening and the compliance tensors. The extended material model predicted the elastic-plastic results from cyclic push-pull experiments. Also, a phenomenological analysis of the cyclic elastic response showed isotropic damage in the elastic moduli. The steady-state damage increased linearly with the cyclic plastic strain range.
Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 68, 1-15 p.
Non-linear elasticity, High strength steel, Bainite, Strength differential effect, Cyclic experiments, Isotropic damage
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-121617DOI: 10.1016/j.ijmecsci.2012.11.008ISI: 000316974800001ScopusID: 2-s2.0-84875225907OAI: oai:DiVA.org:kth-121617DiVA: diva2:620215
QC 201305082013-05-082013-05-032016-04-18Bibliographically approved