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Study of pure and mixed-mode fracture of a brittle material

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Abstract

In order to study the behavior of a crack in a linear-elastic material in plane mixed mode (modes I+II), a specimen's shape and loading have been specially adapted. The specimens are first precracked in mode I and then subjected to monotonic loading until instability is reached by an original device which makes it possible to control the nature of the mixed mode applied and which is adjustable from pure mode I to pure mode II. After the specimens are fractured, the lengths of the initial cracks and the kinking angles were measured in the plane-strain area. Then the stress-intensity factorsK I andK II at the moment when crack instability appeared were calculated. This made it possible to apply two criteria: maximum principal stress and maximum stressintensity factorK *1 at the onset of kinking. From comparing the calculated values with the experimental values we may note that there is good agreement with respect to the crackkinking directions. However, for the limit load values considerable divergences have been recorded which are analyzed.

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Royer, J. Study of pure and mixed-mode fracture of a brittle material. Experimental Mechanics 28, 382–387 (1988). https://doi.org/10.1007/BF02325180

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  • DOI: https://doi.org/10.1007/BF02325180

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