Abstract
The Linear Elastic Finite Element Analysis was used to determine the influence of geometry and loading conditions on the stress distribution in specimens proposed for fracture testing in mixed mode loading. To establish the contribution of the shear part of the loading towards the overall cracking process, the stress intensity factors KI and KII at the notch tips were estimated from numerical displacements. It was established that in some cases KII is significantly higher than KI, indicating that the shear part of loading plays an important role during the fracture process. The numerical study was complemented by a series of experiments which indicated that shear fracture can be generated if the symmetry of specimen geometry and loading is maintained. A comparison of fracture zone characteristics generated under static and impact loading is also given and it was observed that the strain rate does not alter the fundamental features of a cracking process.
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