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Second Sandia Fracture Challenge: CanmetMATERIALS’ Prediction

[+] Author Affiliations
Bruce W. Williams, Hari Simha

CanmetMATERIALS, Hamilton, ON, Canada

Paper No. IMECE2015-51885, pp. V009T12A076; 9 pages
doi:10.1115/IMECE2015-51885
From:
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5752-6
  • Copyright © 2015 by Her Majesty the Queen in right of Canada

abstract

This paper is a description of the models and methods used by CanmetMATERIALS to model failure and fracture of Ti-6Al-4V alloy sample as part of the Second Sandia Fracture Challenge. Finite element models, meshed with 8-noded brick elements, were used to simulate loading of the tensile, shear, and fracture specimens. The approximate element size near localization and failure in each of the specimens ranged from about 0.2 to 0.4 mm transitioning to larger elements away from the failure zone. Simulations were performed using the explicit dynamic solvers in ABAQUS and DYNA3D. For both solvers, a user-defined subroutine was implemented to describe the material behavior. The Xue-Weirzbicki damage model was used to describe the failure of the material. The foregoing is a general three-dimensional damage-mechanics-based approach to model failure and fracture under low to high constraint and also ductile and shear failure. Plastic deformation was modeled using both isotropic von-Mises and the Cazacu-Plunkett-Barlat 2006 (CPB06) asymmetric/anisotropic yield function. Both subroutines used the Bazant-Pijaudier-Cabot non-local approach to mitigate the mesh dependence of finite element simulations. Crack growth was modeled using the element deletion technique. Though the two subroutines were very similar, there were small differences in the implementations of the two models, such as the tolerances utilized for convergence, which led to two slightly different predictions. The yield and failure models were approximately calibrated using a combination of the tensile, shear data, and supplemented with data from the open literature. Blind predictions of the loading of the challenge-sample geometry were made and subsequently found to be in reasonable agreement with the experiments carried out at Sandia National Labs. Sources of discrepancies are identified and discussed in this report.

Copyright © 2015 by Her Majesty the Queen in right of Canada

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