Abstract
Industrial structural elements are often subjected to complex loading, including opening mode (mode I), transverse (mode II) and longitudinal (mode III) shear, as well as various combinations of these three main loading modes. The separate effect of the loading modes is widely researched, while their combined action on structural elements, especially containing small cracks, is much less investigated. In this paper, a mathematical model in deformational parameters of crack tip opening displacement (CTOD) is proposed for the description of small crack propagation in thick plates subjected to mixed mode II and mode III fatigue loading. The model is formulated based on the energy approach, and the suggested formulas for mode II and mode III CTOD determination take into account the relative load level of the plate. Further, the obtained model is applied for the lifetime determination of a thick plate. In addition, the effect of the principal load direction on the lifetime is considered.
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