SYMPOSIA PAPER Published: 01 January 1991
STP16846S

Normalization: An Experimental Method for Developing Curves

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The method of normalization has been used to develop J-R curves for metallic materials based only on analysis of load and displacement pairs in a ductile fracture test record. This method eliminates the need for crack length monitoring equipment. It not only provides a method for more easily conducting and evaluating J-R curve tests; but it could be useful for tests conducted under special conditions such as under dynamic loading, in restructive facilities such as a hot cell, or even in a facility with limited instrumentation.

The method uses a normalized deformation curve which has a functional relationship resembling a power law in the beginning and a straight line later. A functional form is proposed to fit this material deformation pattern. This form was used along with the load versus displacement records to evaluate J-R curves for many materials. The results showed that the new method was a more accurate and versatile one for the assessment of the J-R curve. Compared with previous application of this method, the accuracy is remarkably improved in the beginning stages of the J-R curve where a JIc point is determined. The JIc point was analyzed on more than 60 specimens and found to be consistent with methods used in the ASTM test standards.

Author Information

Zhou, Z
National University of Mar Del Plata, Knoxville, TN, Argentina
Lee, K
National University of Mar Del Plata, Knoxville, TN, Argentina
Herrera, R
National University of Mar Del Plata, Knoxville, TN, Argentina
Landes, JD
National University of Mar Del Plata, Knoxville, TN, Argentina
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Details
Developed by Committee: E08
Pages: 42–56
DOI: 10.1520/STP16846S
ISBN-EB: 978-0-8031-5172-7
ISBN-13: 978-0-8031-1418-0