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Tension-torsion fracture experiments - Part II: Simulations with the extended Gurson model and a ductile fracture criterion based on plastic strain
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2013 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 50, no 25-26, 4258-4269 p.Article in journal (Refereed) Published
Abstract [en]

An extension of the Gurson model that incorporates damage development in shear is used to simulate the tension-torsion test fracture data presented in Faleskog and Barsoum (2013) (Part I) for two steels, Weldox 420 and 960. Two parameters characterize damage in the constitutive model: the effective void volume fraction and a shear damage coefficient. For each of the steels, the initial effective void volume fraction is calibrated against data for fracture of notched round tensile bars and the shear damage coefficient is calibrated against fracture in shear. The calibrated constitutive model reproduces the full range of data in the tension-torsion tests thereby providing a convincing demonstration of the effectiveness of the extended Gurson model. The model reinforces the experiments by highlighting that for ductile alloys the effective plastic strain at fracture cannot be based solely on stress triaxiality. For nominally isotropic alloys, a ductile fracture criterion is proposed for engineering purposes that depends on stress triaxiality and a second stress invariant that discriminates between axisymmetric stressing and shear dominated stressing.

Place, publisher, year, edition, pages
2013. Vol. 50, no 25-26, 4258-4269 p.
Keyword [en]
Ductile fracture, Fracture in shear, Tension-torsion test, Fracture criterion, Lode parameter
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-136473DOI: 10.1016/j.ijsolstr.2013.08.028ISI: 000326666000010ScopusID: 2-s2.0-84885433591OAI: diva2:676610

QC 20131206

Available from: 2013-12-06 Created: 2013-12-05 Last updated: 2013-12-06Bibliographically approved

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