| Autor: |
Lebovka, N. I., Mank, V. V., Pivovarova, N. S. |
| Zdroj: |
Materials Science; January 1995, Vol. 30 Issue: 1 p87-94, 8p |
| Abstrakt: |
Fracture of heterogeneous materials under cycling loading is investigated by using a simple deterministic model. A material is simulated by an inhomogeneous two-dimensional square lattice. Characteristics of the fracture process are studied as functions of the amplitude of the strain factor ?R and the loading periodtp; the durability of the material is also analyzed as a function of these parameters. It is shown that the degree of fracture in the system increases with ?R for smalltp and is practically independent of ?R for largetp. The fractal dimensionality remains constant under all conditions and is equal toD=1.10±0.04. Fracture clusters at points of destruction of the material (percolation clusters) are anisotropic and their width-to-length ratio (the anisotropy parameter) averaged over all possible configurations is equal to d=0.18±0.10 (?E=90). A power decrease in the elasticity modulusE of the system with an index t=0.39±0.17 is observed near the percolation threshold. |
| Databáze: |
Supplemental Index |
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