SEDL / STP / STP1332-EB / STP14947S

A Numerical Investigation of Loading Rate Effects in Pre-Cracked CVN Specimens

Koppenhoefer, KC
Senior Research Engineer, Edison Welding Institute, Columbus, Ohio

Dodds, RH
Professor, University of Illinois at Urbana-Champaign, Urbana, Illinois

Pages: 19    Published: Jan 1999

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Abstract

Specimen size and loading rate effects on cleavage fracture and R-curve response remain important technological impediments to industrial application of the pre-cracked Charpy specimen. This investigation employs plane strain and 3-D, nonlinear finite element analyses to conduct an evaluation of crack front stress triaxiality and resistance to ductile tearing for static and impact-loaded, pre-cracked CVN specimens. For cleavage fracture, crack front conditions are characterized in terms of the Weibull stress. To examine impact loading rate effects on resistance to ductile tearing, this investigation employs the computational cell methodology to analyze stable extension of a macroscopic crack in ductile metals under quasi-static and impact loading.