Published: Jan 1999
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In a ductile fracture methodology developed by Landes et al., the result from a laboratory test is used to predict the behavior of a structural component. Within the framework of this methodology, a critical step consists in obtaining the calibration function for the structural component. For those cases where the limit load solution for the structural component is known, a transformation procedure has been used to get the calibration function for the structure directly from that of a fracture toughness specimen. Although the transformation procedure does not involve complex calculations, it does require the user to follow several steps where point to point computations are necessary. This makes the whole process laborious and time consuming. It will be shown in this paper that, with an additional assumption and without loss of accuracy, the transformation procedure can be greatly simplified. In the alternative procedure proposed here, the coefficients of the calibration function for the structure are obtained by simply scaling then counterparts for the fracture toughness specimen. This is accomplished with the use of two factors: a load factor and a deformation factor. Some examples are presented to demonstrate the convenience of this new procedure.
ductile fracture, failure assessment, cracked structures, fracture toughness, calibration function
IPEN-CNEN/SP, São Paulo, SP,
The University of Tennessee, Knoxville, TN