SYMPOSIA PAPER Published: 01 January 1994

Fracture Criteria for Surface Cracks in Brittle Materials


If a structural material behaves in a linearly elastic manner, it is generally assumed that plane-strain fracture toughness (KIc) and a proven equation for calculating an applied stress-intensity factor can be used to predict conditions for catastrophic fracture. The adequacy of this approach has been verified for some specific applications, generally through-cracks in plate material. Recent fracture test results and analyses of surface cracks in brittle materials have raised a concern about the validity of using KIc and the maximum value of the calculated stress-intensity factors to predict fracture conditions. This paper presents test data and results obtained from different procedures, all based on KIc, for predicting failure for three-dimensional surface cracks.

Author Information

Reuter, WG
Idaho National Engineering Lab., EG&G Idaho, Idaho Falls, ID
Newman, JC
NASA-Langley Research Center, Hampton, VA
Macdonald, BD
Knolls Atomic Power Lab., Schenectady, NY
Powell, SR
Bell Helicopter Textron, Fort Worth, TX
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Developed by Committee: E08
Pages: 617–635
DOI: 10.1520/STP13729S
ISBN-EB: 978-0-8031-5270-0
ISBN-13: 978-0-8031-1990-1