Premium
Stability analysis and experimental verification for optimum notch configuration in chevron‐notched round bar specimens
Author(s) -
RAY K. K.,
VEERABABU A.,
SARKAR R.
Publication year - 2009
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2009.01357.x
Subject(s) - fracture toughness , materials science , chevron (anatomy) , bar (unit) , composite material , stress intensity factor , compact tension specimen , structural engineering , fracture (geology) , toughness , fracture mechanics , crack growth resistance curve , engineering , crack closure , geology , oceanography , paleontology
In some earlier communications [Ray and Poddar, FFEMS, 27 (2004), Sarkar and Ray, FFEMS, 31 (2008)], a methodology to estimate the minimum normalized stress intensity factor for chevron‐notched round bar (CVNRB) specimens has been outlined. The primary aim of this report is to theoretically analyse stable crack propagation in CVNRB specimens in order to estimate conservative fracture toughness value associated with this specimen geometry. The theoretical analyses have been substantiated using fracture toughness tests on CVNRB specimens of steel having initial normalized notch lengths (α 0 ) between 0.2 and 0.5. The major inferences drawn from this investigation are: (1) the optimum notch geometry in CVNRB specimens corresponds to 0.2 < α 0 < 0.3 for the maximum stable crack extension, and (2) the estimated fracture toughness of the steel using CVNRB specimens indicates minimum K ICV at α 0 = 0.29 in good agreement with the theoretical analyses.