Abstract
The dependence of the critical load on the degree of nonuniformity of the stress field is considered on the example of polymethylmethacrylate beams and plates with a round hole or a sharp notch. It is proposed to use nonlocal criteria for brittle fracture to describe the behavior of a nonuniformly stressed material. Among the criteria considered, the structural criterion is the most universal, because, in this case, the distance parameter d is least dependent on the test configuration. The distance parameters in problems with a regular concentrator are of the same order of magnitude, as in problems with a singular stress concentrator. A further modification of the criterion that takes into account the properties of the fracture process will probably make it possible to obtain a unique value for the length parameter for any degree of nonuniformity of the stress field.
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Original Russian Text © A.A. Chevrychkina, A.A. Gruzdkov, Yu.V. Petrov, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 8, pp. 1570–1575.
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Chevrychkina, A.A., Gruzdkov, A.A. & Petrov, Y.V. Application of nonlocal criteria for destruction in problems with a nonuniform stress field. Phys. Solid State 59, 1594–1599 (2017). https://doi.org/10.1134/S1063783417080042
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DOI: https://doi.org/10.1134/S1063783417080042