Abstract
A method for the direct measurement of the fracture energy γF of brittle materials is presented. The samples used are of the double cantilever beam (DCB) type and have a groove to guide the crack to a hole where it is entrapped; thus, the elastic energy stored in the specimen will be released by the returning of the crosshead of the testing instrument. The energy of fracture is then measured directly by the ratio of the area of the ’’load-vs-displacement’’ cycle to the surface of the fracture measured on a photographic enlargement. Results obtained from microscope slides are the following: 3.5 J/m2 in air and 5 J/m2 in dry nitrogen. This method allows for good control of the fracture speed and is well designed to determine γF in opaque brittle materials where the length of the crack is difficult to measure.
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