4.7 Article

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

期刊

ENGINEERING FRACTURE MECHANICS
卷 252, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.107845

关键词

Ductile fracture; Damage; Finite element analysis

资金

  1. COMET program within the K2 Center Integrated Computational Material, Process and Product Engineering (IC-MPPE) [859480]
  2. Austrian Federal Ministries for Climate Action, Environment, Energy, Mobility, Innovation and Technology (BMK)
  3. Digital and Economic Affairs (BMDW) by the Austrian research funding association (FFG)
  4. federal state of Styria
  5. federal state of Upper Austria
  6. federal state of Tyrol

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The research successfully simulated two different failure modes in structures with precracks using ductile fracture locus models and local damage/element deletion approach, with detailed explanations of the failure process.
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 precracked 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 forcedisplacement 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.

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