SYMPOSIA PAPER Published: 01 January 1980
STP36987S

On the Equivalence Between Semi-Empirical Fracture Analyses and R-Curves

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This paper examines the relationship between several semi-empirical fracture analyses (SEFA) and the R-curve concept of fracture mechanics. The conditions for equivalence between a SEFA and an R-curve are derived. A hypothetical (imaginary) material is employed to study the relationship analytically. Equivalent R-curves (ERC) are developed for real materials using data from the literature.

For each SEFA there is an ERC whose magnitude and shape are determined by the SEFA formulation and its empirical parameters. If the R-curve is indeed unique, then the various empirical parameters cannot be constant, and vice versa. However, for one SEFA the differences are small enough that they may be within the range of normal data scatter for real materials.

Author Information

Orange, TW
National Aeronautics and Space Administration-Lewis Research Center, Cleveland, Ohio
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Details
Developed by Committee: E08
Pages: 478–499
DOI: 10.1520/STP36987S
ISBN-EB: 978-0-8031-4770-6
ISBN-13: 978-0-8031-0363-4