Fiber bundle models for stress release and energy bursts during granular shearing

被引：19

作者：

Michlmayr, Gernot ^{[1
]}

Or, Dani ^{[1
]}

Cohen, Denis ^{[2
,3
]}

机构：

[1] Swiss Fed Inst Technol, Inst Terr Ecosyst, CH-8092 Zurich, Switzerland

[2] Univ Geneva, Inst Environm Sci, CH-1227 Carouge, Switzerland

[3] Iowa State Univ, Dept Geol & Atmospher Sci, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW E | 2012年 / 86卷 / 06期

关键词：

FORCE FLUCTUATIONS; MECHANISMS; FAILURE; MEDIA; BULK;

D O I：

10.1103/PhysRevE.86.061307

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Fiber bundle models (FBMs) offer a versatile framework for representing transitions from progressive to abrupt failure in disordered material. We report a FBM-based description of mechanical interactions and associated energy bursts during shear deformation of granular materials. For strain-controlled shearing, where elements fail in a sequential order, we present analytical expressions for strain energy release and failure statistics. Results suggest that frequency-magnitude characteristics of fiber failure vary considerably throughout progressive shearing. Predicted failure distributions were in good agreement with experimentally observed shear stress fluctuations and associated bursts of acoustic emissions. Experiments also confirm a delayed release of acoustic emission energy relative to shear stress buildup, as anticipated by the model. Combined with data-rich acoustic emission measurements, the modified FBM offers highly resolved contact-scale insights into granular media dynamics of shearing processes. DOI: 10.1103/PhysRevE.86.061307

引用

页数：7

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