Abstract
Brittle fracture in U-notched specimens made of porous graphite reinforced by aluminum particles is experimentally and theoretically investigated under compressive loading conditions, i.e. the closing mode loading. Using fracture tests, the critical loads of such specimens are experimentally acquired. Then, the maximum tangential stress and the mean stress criteria are used with the critical parameters obtained from an experimental calibration for predicting the critical loads of the specimens theoretically; showing great agreement with the experimental results. After that, the compressive critical stress of the reinforced porous graphite is theoretically estimated by means of the Equivalent Material Concept and used inside the two criteria for theoretical predictions. Referring to the successful joint of this concept with the criteria mentioned above, it is revealed that this concept is a strong tool for estimating the compressive critical stress of graphite materials without the need for experimental calibration.
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