Mixed mode I/II fracture investigation of Perspex based on the averaged strain energy density criterion

Research output: Contribution to journalArticleScientificpeer-review


Research units

  • Iran University of Science and Technology
  • University of Padova
  • Norwegian University of Science and Technology
  • University of Waterloo


In this work, some recent mixed mode I/II fracture toughness results obtained from Perspex (or polymethylmethacrylate (PMMA)) with four simple cracked specimens subjected to the conventional three-point bend loading are reanalysed based on local energy concept. Although all the mentioned samples have been tested under the same and similar mode mixities, different fracture toughness envelopes were obtained for mixed mode I/II fracture of PMMA. The averaged strain energy density (SED) criterion has been applied in the past for different types of notched specimens (including U, V, O and keyhole notches). It is shown that the mixed mode tensile-in plane shear fracture toughness data obtained from the semicircular and triangular crack type specimens are successfully predicted for sharp cracked PMMA samples using the SED criterion.


Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalPhysical Mesomechanics
Issue number2
Publication statusPublished - 1 Apr 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • fracture toughness, mixed mode I/II, PMMA, SED criterion, semicircular and triangular specimens

ID: 13651826