Stress intensity factor solutions for CTS mixed mode specimen


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Antunes F., Branco R., Ferreira J. A. M. , Borrego L. P.

FRATTURA ED INTEGRITA STRUTTURALE, vol.13, no.48, pp.676-692, 2019 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 48
  • Publication Date: 2019
  • Doi Number: 10.3221/igf-esis.48.64
  • Journal Name: FRATTURA ED INTEGRITA STRUTTURALE
  • Journal Indexes: Emerging Sources Citation Index, Scopus
  • Page Numbers: pp.676-692
  • Keywords: CTS specimen, Stress intensity factor solution, Mixed mode, CRACK-GROWTH RESISTANCE, FRACTURE-TOUGHNESS

Abstract

The Compact Tension Shear (CTS) specimen is used to study fracture and fatigue under mixed mode I/II loading conditions. The K solution available in literature was developed for fracture studies and does not consider the effect of crack deflection. The aim of present work is to develop K-I and K-II empirical solutions for cracks with different crack lengths, loading angles and crack orientations. A total number of 1120 cracked geometries were studied numerically with the finite element method and analytical solutions were fitted to the numerical predictions. An average difference of 0.53 % was found between numerical predictions and the analytical solution proposed for K-I. For K-II the difference is higher, but the equivalent stress intensity factor showed a difference of only 1% because K-II is lower than K-I. Experimental work was developed to study fatigue crack growth in CTS specimens. The cracks always adopted a direction approximately normal to loading direction, i.e., tend to propagate under mode I.