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  • 1
    Digitale Medien
    Digitale Medien
    Dynamic Function of Damage and Its Implications (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 145-149 (Oct. 1997), p. 411-420 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/44/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.145-149.411.pdf
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  • 2
    Digitale Medien
    Digitale Medien
    Damage Localization as a Possible Precursor of Earthquake Rupture (2000)
    Springer
    Pure and applied geophysics 157 (2000), S. 1929-1943 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Key Words: Heterogeneous medium, rupture, statistical mesoscopic damage mechanics, dynamic function of damage, damage localization.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract —Based on the concepts of statistical mesoscopic damage mechanics, the rupture of a heterogeneous medium is investigated in terms of numerical simulations of a network model, subjected to simple shear loading. The heterogeneities are simulated by varying the sizes and fracture strains of the elements of the network. Progressive damage is governed by a damage field equation and a dynamic function of damage (DFD). From the damage field equation, a criterion for damage localization can be derived, and the DFD can be extracted from the simulations of the network. Importantly, the DFD intrinsically governs the damage localization. Both stress-free and periodic boundary conditions for the network are examined. It is found that damage localization may be the underlying mechanism of eventual rupture and thus could be used as a possible precursor of earthquake rupture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00001068
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  • 3
    Digitale Medien
    Digitale Medien
    Numerical Simulation of Rock Failure and Earthquake Process on Mesoscopic Scale (2000)
    Springer
    Pure and applied geophysics 157 (2000), S. 1905-1928 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Key Words: Numerical simulation, discrete element method, lattice model, rock failure, earthquake process.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract —On the basis of the lattice model of Mora and Place, Discrete Element Method, and Molecular Dynamics approach, another kind of numerical model is developed. The model consists of a 2-D set of particles linked by three kinds of interactions and arranged into triangular lattice. After the fracture criterion and rules of changes between linking states are given, the particle positions, velocities and accelerations at every time step are calculated using a finite-difference scheme, and the configuration of particles can be gained step by step. Using this model, realistic fracture simulations of brittle solid (especially under pressure) and simulation of earthquake dynamics are made.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00001067
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  • 4
    Digitale Medien
    Digitale Medien
    Evolution-induced Catastrophe and its Predictability (2000)
    Springer
    Pure and applied geophysics 157 (2000), S. 1945-1957 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Key Words: Evolution-induced catastrophe, sample-specificity, stress fluctuations, earthquake prediction, predictability.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstrac —Both earthquake prediction and failure prediction of disordered brittle media are difficult and complicated problems and they might have something in common. In order to search for clues for earthquake prediction, the common features of failure in a simple nonlinear dynamical model resembling disordered brittle media are examined. It is found that the failure manifests evolution-induced catastrophe (EIC), i.e., the abrupt transition from globally stable (GS) accumulation of damage to catastrophic failure. A distinct feature is the significant uncertainty of catastrophe, called sample-specificity. Consequently, it is impossible to make a deterministic prediction macroscopically. This is similar to the question of predictability of earthquakes. However, our model shows that strong stress fluctuations may be an immediate precursor of catastrophic failure statistically. This might provide clues for earthquake forecasting.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00001069
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