Use of Laser Holography and Image Analysis for Crack Measurement and Determination of Strain Fields in Cement Based Materialsby Richard A. Miller, Northwestern Univ, Evanston, United States,
Alberto Castro-Montero, Northwestern Univ, Evanston, United States,
Surendra P. Shah, Northwestern Univ, Evanston, United States,
Abstract: The authors have successfully used laser holographic interferometry to measure various parameters, such as crack size, crack spacing, crack opening displacement, surface displacements and surface strain fields, for several types of specimens. The types of specimens used include: center cracked mortar plates with and without 'model' large aggregates and center cracked cylinders. Information from these tests was then used to check the validity of finite element modeling of fracture in concrete.
Subject Headings: Cracking | Lasers | Imaging techniques | Displacement (mechanics) | Strain | Model tests | Finite element method | Materials processing
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