Principal engineer, Idaho National Engineering Lab., EG&G Idaho, Idaho Falls, ID
Senior scientist, NASA-Langley Research Center, Hampton, VA
Principal engineer, Knolls Atomic Power Lab., Schenectady, NY
Engineering specialist, Bell Helicopter Textron, Fort Worth, TX
Pages: 19 Published: Jan 1994
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.
surface crack, plane-strain fracture toughness, metal, ceramic
Paper ID: STP13729S