 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
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| A.G. Demeshkin, V.M. Kornev, and V.D. Kurguzov, "Crack Nucleation near Stress Concentrators in Quasi-Brittle Materials," Mech. Solids. 47 (1), 86-94 (2012) |
| Year |
2012 |
Volume |
47 |
Number |
1 |
Pages |
86-94 |
| DOI |
10.3103/S0025654412010086 |
| Title |
Crack Nucleation near Stress Concentrators in Quasi-Brittle Materials |
| Author(s) |
A.G. Demeshkin (Lavrentyev Institute of Hydrodynamics, Siberian Branch of Russian Academy of Sciences, pr-t Akad. Lavrentyeva 15, Novosibirsk, 630090 Russia)
V.M. Kornev (Lavrentyev Institute of Hydrodynamics, Siberian Branch of Russian Academy of Sciences, pr-t Akad. Lavrentyeva 15, Novosibirsk, 630090 Russia, kornev@hydro.nsc.ru)
V.D. Kurguzov (Lavrentyev Institute of Hydrodynamics, Siberian Branch of Russian Academy of Sciences, pr-t Akad. Lavrentyeva 15, Novosibirsk, 630090 Russia, kurguzov@hydro.nsc.ru) |
| Abstract |
The results of combined tension (compression) and shear experiments with plexiglass specimens are used to construct a Coulomb-Mohr-type strength curve. Fracture experiments were performed with plexiglass square plates with internal through cuts. The specimens were subjected to compression on a Zwick/Roell testing machine until cracks appeared. In the process of testing, nucleation of symmetric cracks was observed, which propagated as the load was further increased. The fracture character (tensile or shear) could not be decided until a subsequent numerical analysis of the plate stress-strain state was performed by the finite element method. The stress concentration loci were found to coincide with the crack nucleation loci. In the plane (σ,τ), Mohr's circles were constructed for the stress states at the stress concentration points. If the point at which Mohr's curve touches the limit curve is known, then one can determine the plane on which the normal and tangential stresses attain critical values, and hence one can determine the crack propagation direction. The experimental results and numerical solutions were found to be in good agreement. |
| Keywords |
strength, fracture, fracture toughness, stress concentrators |
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|
| Received |
16 June 2009 |
| Link to Fulltext |
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