Experimental Mechanics

, Volume 28, Issue 2, pp 142–145

An overdeterministic approach for measuringKI using strain gages


  • J. R. Berger
    • Fracture and Deformation DivisionNational Bureau of Standards
  • J. W. Dally
    • Mechanical Engineering DepartmentUniversity of Maryland

DOI: 10.1007/BF02317564

Cite this article as:
Berger, J.R. & Dally, J.W. Experimental Mechanics (1988) 28: 142. doi:10.1007/BF02317564


An overdeterministic method for determining the opening-mode stress-intensity factor,KI, from many measurements of the radial strain,rr, is described. The method was verified with an experimental study of a compact-tension specimen where strains along the 0, 45 and 90-degree lines were measured using strip gages with ten strain sensors per strip gage. The results indicated errors in the range of one to three percent with three or four parameter models of the strain field in the region near the crack tip.

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© Society for Experimental Mechanics, Inc. 1988