Experimental and numerical analysis of size effects on stress intensity in anisotropic porous materials

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Touliatou, Dimitra and Wheel, Marcus A. (2019) Experimental and numerical analysis of size effects on stress intensity in anisotropic porous materials. Engineering Failure Analysis, 104. pp. 772-783. ISSN 1350-6307 (https://doi.org/10.1016/j.engfailanal.2019.04.009)

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Abstract

A prominent size effect has previously been reported for the fracture behaviour of brittle porous materials, with smaller specimens behaving quite differently to their larger counterparts. In such materials, the size of the K-dominant zone has been numerically found to be greatly affected by the presence of voids in the near-tip area, thus putting the assumption of a single fracture parameter under question. In order to address this, in this study mode I tests are conducted on porous double cantilever beam specimens, while the stress distribution in the near-tip area is being observed by means of photoelasticity. Results validate the predicted size eect and suggest that the voids can indeed alter the size and shape of the stress pattern in the specimens. A parametric study is then conducted to investigate the in uence of void shape variations that can be caused by manufacturing inaccuracies on the stress concentration at the crack tip. It is found that although the stress intensity at the crack tip can be greatly aected by such factors, the size of the K-dominant zone remains unaffected.

ORCID iDs

Touliatou, Dimitra ORCID logoORCID: https://orcid.org/0000-0003-1110-2187 and Wheel, Marcus A. ORCID logoORCID: https://orcid.org/0000-0002-1372-6324;
  • Item type:Article
    ID code:67612
    Dates:
    Date
    Event
    1 October 2019
    Published
    6 June 2019
    Published Online
    8 April 2019
    Accepted
    12 September 2018
    Submitted
    Notes:Copyright © 2019 Elsevier B.V. Dimitra Touliatou, Marcus A. Wheel, Experimental and numerical analysis of size effects on stress intensity in anisotropic porous materials, Engineering Failure Analysis, Volume 104, 2019, Pages 772-783, https://doi.org/10.1016/j.engfailanal.2019.04.009
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:18 Apr 2019 11:57
    Last modified:16 Dec 2024 02:06
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/67612
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