Slice Synthesis of a Three-Dimensional 'Work-of-Fracture'Specimen.

摘要

In the evaluation of brittle materials such as ceramics, the 'work-of-fracture' specimen is enjoying considerable interest. That specimen, basically a beam bending specimen with rectangular cross section, has inclined notches machined such that the remaining ligament is an isosceles triangle with the apex on the tension surface. The specimen is of particular interest because it tends to provide for slow stable crack propagation in such materials. This report presents the results of an attempt to analyze this truly three-dimensional problem in an approximate 'two-dimensional' fashion, treating the specimen as a series of slices with correction for interslice shear effects. Both beam bending and beam shear effects on compliance are considered. Comparison of experimental and analytical results is discussed. The observed stability characteristics of the work-of-fracture specimen is discussed in light of these results.