Evaluation of crack tip stress and strain fields under nonproportional loading in a viscoelastic material

K. Sakaue, Y. Uchiyama, H. Tanaka, S. Yoneyama, M. Takashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The crack tip strain and stress fields in a viscoelastic material under nonproportional loading conditions are evaluated. In order to evaluate the strain field, the crack tip displacement field is measured by using the digital image correlation (DIC) technique. This displacement field is then approximated by using the theoretically obtained crack tip displacement field in viscoelastic materials. The result shows that the approximation method can smoothly reconstruct the experimentally obtained displacement field. From the approximated displacement field, the crack tip strain field can be precisely obtained by using the differential form of the theoretical displacement. On the other hand, the crack tip stress field is analyzed by using the stress function. This suggests that the strain and stress fields can be independently evaluated. In addition, different time dependencies between stress and strain fields near the crack tip are observed. Based on this experiment, we can discuss the several criteria for the crack propagation directions in viscoelastic materials.

Original languageEnglish
Pages (from-to)4140-4150
Number of pages11
JournalEngineering Fracture Mechanics
Issue number14
Publication statusPublished - 2008 Sept 1
Externally publishedYes


  • Digital image correlation
  • Fracture mechanics
  • Mixed-mode
  • Stress intensity factor
  • Viscoelasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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