Abstract
Development of failure in quasi-brittle materials is associated with microcracks, which release energy in the form of elastic waves called acoustic emission. From three types of tests - diametral compression, flexure and indentation - on specimens of high strength concrete, locations of acoustic emission were observed to form in the critically stressed region in a more or less diffuse manner for stress below the material's strength. However, as damage increased and peak stress was reached, a coalescence or localization of damage occurred and the zone formed a distinct volume, the so-called intrinsic process zone. Typically, the zone was similar in length for specimens of various size. Thus, it appeared that the acoustic emission technique was able to identify a characteristic length of the quasi-brittle material.
Original language | English (US) |
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Pages (from-to) | 225-233 |
Number of pages | 9 |
Journal | Construction and Building Materials |
Volume | 15 |
Issue number | 5-6 |
DOIs | |
State | Published - 2001 |
Bibliographical note
Funding Information:Partial support was provided by the National Science Foundation grant number CMS-0070062.
Keywords
- Acoustic emission
- Characteristic length
- Size effect