Abstract
In this paper, two practical linear-elastic equations for the evaluation of the critical value of the J-integral in plates with U-notches under Mode I loading are presented and applied to brittle and quasi-brittle materials. It is found that these two proposed equations provide the same results with differences being negligible. By using one of these equations one can evaluate the Jcr and then predict the critical fracture load by means of the Jcr criterion. The results show that the material control radius to the notch root radius ratio (Rc/ρ), and the Poisson's ratio affect the critical value of the J-integral (Jcr) in U-notches under Mode I loading, and other parameters may be negligible. The predicted fracture loads are compared with experimental results. Two different materials are considered in the tests: a composite material (Al-15%SiC) tested at room temperature and a steel with a ferritic-pearlitic structure tested at −40°C.
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