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559504.pdf (1.88 MB)

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2008

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/18830

Critical ruptures in a bundle of slowly relaxing fibers

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Recurs relacionat

http://doi.org/10.1103/PhysRevE.77.036102

Resum

We study the damage enhanced creep rupture of disordered materials by means of a fiber bundle model. Broken fibers undergo a slow stress relaxation modeled by a Maxwell element whose stress exponent m can vary in a broad range. Under global load sharing we show that due to the strength disorder of fibers, the lifetime tf of the bundle has sample-to-sample fluctuations characterized by a log-normal distribution independent of the type of disorder. We determine the Monkman-Grant relation of the model and establish a relation between the rupture life tf and the characteristic time tm of the intermediate creep regime of the bundle where the minimum strain rate is reached, making possible reliable estimates of tf from short term measurements. Approaching macroscopic failure, the deformation rate has a finite time power law singularity whose exponent is a decreasing function of m. On the microlevel the distribution of waiting times is found to have a power law behavior with m-dependent exponents different below and above the critical load of the bundle. Approaching the critical load from above, the cutoff value of the distributions has a power law divergence whose exponent coincides with the stress exponent of Maxwell elements.

Matèries

Física de l'estat sòlid, Propietats de la matèria

Matèries (anglès)

Solid state physics, Properties of matter

Citació

Col·leccions

Articles publicats en revistes (Física de la Matèria Condensada)

Citació

KOVACS, K., et al. Critical ruptures in a bundle of slowly relaxing fibers. Physical Review E. 2008. Vol. 77, num. 3, pags. 036102-1-036102-8. ISSN 1063-651X. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/18830

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