TY - JOUR

T1 - Ductile failure modelling in pre-cracked solids using coupled fracture locus theory

AU - Baltic, Sandra

AU - Magnien, Julien

AU - Kolitsch, Stefan

AU - Gänser, Hans-Peter

AU - Antretter, Thomas

AU - Hammer, René

N1 - Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/7

Y1 - 2021/7

N2 - Ductile fracture locus models are extensively used in applied mechanics to predict the initiation of failure thanks to the ease of numerical implementation and simple calibration from experiments. Here, an attempt is made to investigate its potential to model complicated failure modes in pre-cracked structures. A tensile test specimen with a side notch and a pre-crack is fabricated from an off-the-shelf engineering aluminium alloy. Mechanical testing revealed two dissimilar failure patterns whose ambiguity is elaborated in the numerical study. The coupled fracture locus theory combined with the local damage/element deletion approach is adopted as a local failure modelling method. The numerical results show failure process predictions that are in accordance with experimentally observed failure modes in terms of the failure paths and the global force-displacement response. Fundamentally different failure processes, i.e. the mechanisms of strain localisation and classical crack propagation, have been rather well captured. These results suggest high predictive capabilities of the method employed, which captures well the stress-state dependent damaging process governing the development of the failure mode.

AB - Ductile fracture locus models are extensively used in applied mechanics to predict the initiation of failure thanks to the ease of numerical implementation and simple calibration from experiments. Here, an attempt is made to investigate its potential to model complicated failure modes in pre-cracked structures. A tensile test specimen with a side notch and a pre-crack is fabricated from an off-the-shelf engineering aluminium alloy. Mechanical testing revealed two dissimilar failure patterns whose ambiguity is elaborated in the numerical study. The coupled fracture locus theory combined with the local damage/element deletion approach is adopted as a local failure modelling method. The numerical results show failure process predictions that are in accordance with experimentally observed failure modes in terms of the failure paths and the global force-displacement response. Fundamentally different failure processes, i.e. the mechanisms of strain localisation and classical crack propagation, have been rather well captured. These results suggest high predictive capabilities of the method employed, which captures well the stress-state dependent damaging process governing the development of the failure mode.

KW - Damage

KW - Ductile fracture

KW - Finite element analysis

UR - http://www.scopus.com/inward/record.url?scp=85108598678&partnerID=8YFLogxK

U2 - 10.1016/j.engfracmech.2021.107845

DO - 10.1016/j.engfracmech.2021.107845

M3 - Article

AN - SCOPUS:85108598678

VL - 252.2021

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

SN - 0013-7944

IS - July

M1 - 107845

ER -