Abstract
A semi-infinite-crack model is used to supplement the conic section simulation method for determining stress intensity factors of finite cracked bodies under mode I loadings. The actual displaced crack surface profile is found by finite element analysis. For each crack surface segment between two neighbouring nodes, a set of model parameters is found by using the displacements of these two nodes. A stress intensity factor estimate is then calculated from the closed-form formula associated with the model. It is found that near-tip crack surface displacements produce model parameters that are sufficient for quantifying the stress intensity factor. The semi-infinite-crack model can be used either as a stand alone model or in conjunction with the ellipse simulation procedure to form a systematic approach. It is shown that this model can be applied to different geometries and loadings with excellent accuracy.
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Ng, S.W., Lau, K.J. A semi-infinite-crack model for determining mode I stress intensity factors using crack surface displacements. Int J Fract 76, 355–371 (1996). https://doi.org/10.1007/BF00039783
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DOI: https://doi.org/10.1007/BF00039783