Acoustic emissions from rapidly moving cracks

Gross, Steven P.; Fineberg, Jay; Marder, Michael; McCormick, W. D.; Swinney, Harry L.

doi:10.1103/physrevlett.71.3162

Cited by 137 publications

(76 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Later experiments [46], suggested that the break-up of a simple crack to multiple cracks occurred at a critical velocity, at which a single crack became unstable. This instability, which became known at the "microbranching" instability, was later shown to be characteristic of many brittle amorphous materials [11,31,[46][47][48][49][50][51][52][53][54][55]. A comprehensive review of some of the early work on the micro-branching instability can be found in [31].…”

Section: A the Micro-branching Instabilitymentioning

confidence: 99%

Recent developments in dynamic fracture: some perspectives

Fineberg

Bouchbinder

2015

Int J Fract

Self Cite

View full text Add to dashboard Cite

We briefly review a number of important recent experimental and theoretical developments in the field of dynamic fracture. Topics include experimental validation of the equations of motion for straight tensile cracks (in both infinite media and strip geometries), validation of a new theoretical description of the near-tip fields of dynamic cracks incorporating weak elastic nonlinearities, a new understanding of dynamic instabilities of tensile cracks in both 2D and 3D, crack front dynamics, and the relation between frictional motion and dynamic shear cracks. Related future research directions are briefly discussed.

show abstract

Section: A the Micro-branching Instabilitymentioning

confidence: 99%

Recent developments in dynamic fracture: some perspectives

Fineberg

Bouchbinder

2015

Int J Fract

Self Cite

View full text Add to dashboard Cite

show abstract

“…When a het-erogeneous material is stretched its evolution towards breaking is characterized by the appearance of microcracks before the final break-up. Microcracks produce both an acoustic and an electromagnetic (EM) emission in the frequency range from VLF to VHF (Gross et al, 1993;Carrilo et al, 1998;Mavromatou and Hadjicontis, 2001). The microcracks and the associated acoustic and EM activities constitute the so-called precursors of general fracture.…”

Section: Introductionmentioning

confidence: 99%

Evolving towards a critical point: A possible electromagnetic way in which the critical regime is reached as the rupture approaches

Kapiris

Eftaxias

Νομικός

et al. 2003

Nonlin. Processes Geophys.

View full text Add to dashboard Cite

Abstract. In analogy to the study of critical phase transitions in statistical physics, it has been argued recently that the fracture of heterogeneous materials could be viewed as a critical phenomenon, either at laboratory or at geophysical scales. If the picture of the development of the fracture is correct one may guess that the precursors may reveal the critical approach of the main-shock. When a heterogeneous material is stretched, its evolution towards breaking is characterized by the appearance of microcracks before the final break-up. Microcracks produce both acoustic and electromagnetic (EM) emission in the frequency range from VLF to VHF. The microcracks and the associated acoustic and EM activities constitute the so-called precursors of general fracture. These precursors are detectable not only at laboratory but also at geophysical scales. VLF and VHF acoustic and EM emissions have been reported resulting from volcanic and seismic activities in various geologically distinct regions of the world. In the present work we attempt to establish the hypothesis that the evolution of the Earth's crust towards the critical point takes place not only in a mechanical but also in an electromagnetic sense. In other words, we focus on the possible electromagnetic criticality, which is reached while the catastrophic rupture in the Earth's crust approaches. Our main tool is the monitoring of micro-fractures that occur before the final breakup, by recording their radioelectromagnetic emissions. We show that the spectral power law analysis of the electromagnetic precursors reveals distinguishing signatures of underlying critical dynamics, such as: (i) the emergence of memory effects; (ii) the decrease with time of the anti-persistence behaviour; (iii) the presence of persistence properties in the tail of the sequence of the precursors; and (iv) the acceleration of the precursory electromagnetic energy release. Moreover, the statistical analysis of the amplitudes of the electromagnetic fluctuations reveals the breaking of the symmetry as the theory predicts. Finally, we try to answer the question: how universal the observed Correspondence to: K. A. Eftaxias (ceftax@phys.uoa.gr) electromagnetic critical behaviour of the failing system is?

show abstract

“…At the critical strain of 30% the fracture energy per unit area for the nanophase system is estimated to be 40 J/m 2 ; in contrast, its value for crystalline Si 3 N 4 is only 4 J/m 2 . This comparison along with the analysis of fracture surfaces discussed in the preceding paragraph indicates that multiple cracks are primarily responsible for energy dissipation [18][19][20] in the nanophase a-Si 3 N 4 system. This is consistent with a model calculation by Hoagland and Embury 21 for the elastic interaction between microcracks around the main crack tip.…”

Section: Effect Of Multiple Cracks On Toughnessmentioning

confidence: 99%

Dynamics of Consolidation and Crack Growth in Nanocluster‐Assembled Amorphous Silicon Nitride

Tsuruta

Nakano

Kalia

et al. 1998

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Consolidation and fracture dynamics in nanophase amorphous Si 3 N 4 are investigated using 10 6 -atom moleculardynamics simulations. At a pressure of 15 GPa and 2000 K, the nanophase system is almost fully consolidated within a fraction of a nanosecond. The consolidation process is welldescribed by the classical theory of sintering. Under an applied strain the consolidated system develops several cracks which propagate parallel to each other, causing failure at multiple sites. The critical strain at which the nanophase system fractures is much larger than that for crystalline Si 3 N 4 .

show abstract

Acoustic emissions from rapidly moving cracks

Cited by 137 publications

References 13 publications

Recent developments in dynamic fracture: some perspectives

Recent developments in dynamic fracture: some perspectives

Evolving towards a critical point: A possible electromagnetic way in which the critical regime is reached as the rupture approaches

Dynamics of Consolidation and Crack Growth in Nanocluster‐Assembled Amorphous Silicon Nitride

Contact Info

Product

Resources

About