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APPLICATION OF THE FINITE FRACTURE MECHANICS APPROACH TO ASSESS THE FAILURE OF A QUASI-BRITTLE MATERIAL WITH A CIRCULAR HOLE
Mechanics of Solids ( IF 0.7 ) Pub Date : 2021-07-13 , DOI: 10.3103/s0025654421030110
S. V. Suknev 1
Affiliation  

Abstract—

The size effect of the strength of structurally inhomogeneous materials is manifested, in particular, in the dependence of the failure load on the size of the stress concentration zone that occurs near material or geometric inhomogeneities (inclusions, pores, cutouts, fillets). Although the size of the stress concentration zone is determined primarily by the size and shape of the inhomogeneity, the loading conditions also have a certain effect. In addition, the predictive value of the fracture theory is determined not only by the ability to take into account the size effect, but also by the possibility of extending the theory to the widest possible range of boundary conditions. The influence of boundary conditions and hole diameter on the initiation of tensile cracks at a circular hole in a quasi-brittle geomaterial under non-uniformly distributed compression was studied theoretically and experimentally, taking into account the scale factor. On the basis of the approach of the finite fracture mechanics, a criterion of quasi-brittle fracture is proposed. The results of calculating the critical stress are compared with the obtained experimental data.



中文翻译:

有限断裂力学方法在评估圆孔准脆性材料失效中的应用

摘要-

结构非均质材料强度的尺寸效应表现在,特别是破坏载荷与材料附近发生的应力集中区的尺寸或几何非均质性(夹杂物、孔隙、切口、圆角)的关系。虽然应力集中区的大小主要由不均匀性的大小和形状决定,但加载条件也有一定的影响。此外,断裂理论的预测价值不仅取决于考虑尺寸效应的能力,还取决于将理论扩展到尽可能广泛的边界条件的可能性。考虑尺度因子,理论和实验研究了边界条件和孔径对非均匀分布压缩下准脆性土工材料圆孔拉伸裂纹萌生的影响。在有限断裂力学方法的基础上,提出了准脆性断裂的判据。计算临界应力的结果与获得的实验数据进行了比较。

更新日期:2021-07-13
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