Intermittency in brittle cracks:Model experiment in artificial rocks
Stress enhancement in the vicinity of brittle cracks makes the macroscale failure properties extremely sensitive to the microscale material disorder.As a result,crack propagation is sometimes observed to display a jerky dynamics with seemingly random sudden jumps spanning a broad range of scales,reminiscent of earthquakes.This so-called crackling dynamics cannot be captured via standard continuum fracture theory.The understandings of the key processes that drive such a dynamics then represent a crucial step toward predictive statistical models for heterogeneous brittle failure.In this context,we designed an experimental setup which permits to drive brittle cracks in opening mode at adjustable velocity throughout model materials of adjustable microstructure.During the fracture,both the mechanical behavior and the acoustic emission are recorded in real time,and post-mortem,the morphology of the fracture surface is obtained by profilometry.Accurate statistical analysis of these experimental data and their interplay is believed to provide a deeper understanding of the key mechanisms responsible for crackling in heterogeneous brittle fracture.
Brittle crack Experiment Crackling dynamics Model rock Acoustic
Jonathan Barés Lamine Hattali Davy Dalmas Daniel Bonamy
CEA IRAMIS SPCSI,Saclay France 91191 UMR CNRS Saint-Gobain,Aubervillier France 93300
国际会议
北京
英文
1-6
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）