Radiated seismic energy and strain energy release in laboratory dynamic tensile fracture

Boler, Frances M.; Spetzler, H.

doi:10.1007/bf00879609

Cited by 13 publications

(7 citation statements)

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“…By way of comparison, the zero velocity fracture energy of PMMA is 140 J/m 2 , and that for soda-lime glass is 4 J/m 2 . Our estimate of the energy in the acoustic emissions is approximately 100 times larger than that of Boler and Spetzler [10], who found that the radiated energy was only 0.05% of the surface energy [11].…”

mentioning

confidence: 55%

“…Following previous calculations by Boler and Spetzler [10], we assume that the energy transported by a plane wave arriving at a particular location is the material density multiplied by the velocity of elastic wave transmission times the out of plane plate velocity squared. We calculate the total radiated energy by assuming that the emissions are isotropically distributed, and that the out of plane velocity is uni-3164 form throughout the plate thickness.…”

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confidence: 99%

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Acoustic emissions from rapidly moving cracks

et al. 1993

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Linear elasticity is unable to predict completely the dynamics of a rapidly moving crack without the addition of a phenomenological fracture energy. Our measurements of acoustic emission, crack velocity, and surface structure demonstrate quantitatively similar dynamical fracture behavior in two very different materials, polymethlymethacrylate and soda-lime glass. This unexpected agreement suggests that there exist universal features of the fracture energy that result from dissipation of energy in a dynamical instability.

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confidence: 55%

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confidence: 99%

Acoustic emissions from rapidly moving cracks

et al. 1993

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“…Energy radiated under mechanical waves emitted both in the solid and in the surrounding atmosphere as sound waves dissipated far from the crack [38,41]. It is usually a very small fraction of the mechanical energy, between 10 −5 and 10 −2 for fracture in glass [46][47][48] or earthquake sources [49]. We can thus neglect this term in the energy budget.…”

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confidence: 99%

How cracks are hot and cool: a burning issue for paper

et al. 2016

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Material failure is accompanied by important heat exchange, with extremely high temperature - thousands of degrees - reached at crack tips. Such a temperature may subsequently alter the mechanical properties of stressed solids, and finally facilitate their rupture. Thermal runaway weakening processes could indeed explain stick-slip motions and even be responsible for deep earthquakes. Therefore, to better understand catastrophic rupture events, it appears crucial to establish an accurate energy budget of fracture propagation from a clear measure of various energy dissipation sources. In this work, combining analytical calculations and numerical simulations, we directly relate the temperature field around a moving crack tip to the part α of mechanical energy converted into heat. By monitoring the slow crack growth in paper sheets using an infrared camera, we measure a significant fraction α = 12% ± 4%. Besides, we show that (self-generated) heat accumulation could weaken our samples by microfiber combustion, and lead to a fast crack/dynamic failure/regime.

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“…We notably compare our results to values reported in a similar experimental setup geometry and loading. Radiation efficiency was measured in these experiments for mode I crack in PMMA and soda‐lime glass (Boler, ; Boler & Spetzler, ; Gross et al, ). In all of these studies, the crack velocity was much higher than in our experiment (from 35 to 2,000 m/s).…”

Section: Discussionmentioning

confidence: 99%

“…In all of these studies, the crack velocity was much higher than in our experiment (from 35 to 2,000 m/s). Radiation efficiency computed from the results reported in Boler and Spetzler () ranges between 10 −5 and 10 −3 . The experiments performed in Gross et al () show that the radiation efficiency is closer to 10 −2 .…”

Section: Discussionmentioning

confidence: 99%

Energy Partitioning During Subcritical Mode I Crack Propagation Through a Heterogeneous Interface

2019

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The energy budget during the propagation of tensile fractures typically includes two major energy dissipation modes: the fracture energy to create a new interface and the radiated energy. Since seismic hazard is related to the amount of seismic energy released, it is important to evaluate precisely the energy budget during fracture propagation and see in particular if it is constant or not. However, two aspects are typically limiting a precise estimate of the energy budget: first, the measurement of the nonseismic energy release and second, the rock heterogeneity-like asperities or barriers. We conducted here laboratory experiments, using an analog material (Polymethyl methacrylate (PMMA)), of a stable mode I interfacial crack propagation close to brittle-creep transition through a heterogeneous interface for different macroscopic rupture velocities to evaluate carefully their energy budget. Both acoustic and optical advances of the crack front were measured simultaneously, providing precise estimates of both types of dissipated energy. We computed the radiation efficiency R (ratio of the radiated energy to the available energy for driving the fracture) and observed a nonlinear increase of R with the average fracture propagation velocity v over 2 orders of magnitude independently of the initial quenched disorder. The experimental observations are supported by a model based on the fluctuations of the local rupture velocity induced by the crack front pinning on local asperities which leads to R ∝ v 0.55 . We discuss implications for slow shear rupture modes, seismicity rate evolution, and induced seismicity.

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Radiated seismic energy and strain energy release in laboratory dynamic tensile fracture

Cited by 13 publications

References 13 publications

Acoustic emissions from rapidly moving cracks

Acoustic emissions from rapidly moving cracks

How cracks are hot and cool: a burning issue for paper

Energy Partitioning During Subcritical Mode I Crack Propagation Through a Heterogeneous Interface

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