Numerical Investigation on Fracture Propagation Mechanism of Pre-Existing Symmetrical Cracks Emanating from the Circular Blast Holes

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-02-28 DOI:10.1007/s11223-024-00611-1
L. Wang, J. Fu, H. Haeri, J. F. Labuz, M. Liu
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Abstract

The mechanism of fracture propagation from the circular blast holes with two symmetrical cracks in rock blasting operations was investigated by the displacement discontinuity method. The stress intensity factors at the crack tips of the pre-existing cracks were numerically determined using the displacement variations near the crack tips. In this paper, the variation of the displacement discontinuities along pre-existing cracks emanating from blast holes are studied and compared using linear, quadratic, and cubic collocations. For the crack tip behavior, cubic collections are used, and also the special crack tip element is employed to reduce the singularity at the crack tips. The numerical results of the normalized stress intensity factor for linear, quadratic, and cubic collocations of the displacement discontinuities compared with the analytical results. These sets of results are compared with one another, and good agreements have been reached between them.

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关于圆形爆破孔产生的预存对称裂缝断裂扩展机制的数值研究
采用位移不连续法研究了岩石爆破作业中带有两条对称裂缝的圆形爆破孔的断裂扩展机理。利用裂纹顶端附近的位移变化数值确定了预存裂纹裂纹顶端的应力强度因子。本文采用线性、二次方和三次方集合方法,研究并比较了沿爆破孔产生的预存裂缝的位移不连续变化。对于裂纹尖端行为,使用了立方集合,还使用了特殊的裂纹尖端元素来减少裂纹尖端的奇异性。位移不连续处的线性、二次方和三次方集合的归一化应力强度因子的数值结果与分析结果进行了比较。这几组结果相互比较,结果一致。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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