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AIMS Materials Science, 2016, 3(4): 1759-1772. doi: 10.3934/matersci.2016.4.1759. Research article

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A kinematic measurement for ductile and brittle failure of materials using digital image correlation

M.M. Reza Mousavi, Masoud D. Champiri, Mohammad S. Joshaghani, Shahin Sajjadi

1 Department of Civil and Environmental Engineering, University of Houston, Houston, TX, USA
2 Department of Construction Management, University of Houston, Houston, TX, USA

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This paper addresses some material level test which is done on quasi-brittle and ductile materials in the laboratory. The displacement control experimental program is composed of mortar cylinders under uniaxial compression shows quasi-brittle behavior and seemingly round-section aluminum specimens under uniaxial tension represents ductile behavior. Digital Image Correlation gives full field measurement of deformation in both aluminum and mortar specimens. Likewise, calculating the relative displacement of two points located on top and bottom of virtual LVDT, which is virtually placed on the surface of the specimen, gives us the classical measure of strain. However, the deformation distribution is not uniform all over the domain of specimens mainly due to imperfect nature of experiments and measurement devices. Displacement jumps in the fracture zone of mortar specimens and strain localization in the necking area for the aluminum specimen, which are reflecting different deformation values and deformation gradients, is compared to the other regions. Since the results are inherently scattered, it is usually non-trivial to smear out the stress of material as a function of a single strain value. To overcome this uncertainty, statistical analysis could bring a meaningful way to closely look at scattered results. A large number of virtual LVDTs are placed on the surface of specimens in order to collect statistical parameters of deformation and strain. Values of mean strain, standard deviation and coeffcient of variations for each material are calculated and correlated with the failure type of the corresponding material (either brittle or ductile). The main limiters for standard deviation and coeffcient of variations for brittle and ductile failure, in pre-peak and post-peak behavior are established and presented in this paper. These limiters help us determine whether failure is brittle or ductile without determining of stress level in the material.

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Keywords: digital image correlation; mortar; aluminum; ductile failure; quasi-brittle failure; statistics

Citation: M.M. Reza Mousavi, Masoud D. Champiri, Mohammad S. Joshaghani, Shahin Sajjadi. A kinematic measurement for ductile and brittle failure of materials using digital image correlation. AIMS Materials Science, 2016, 3(4): 1759-1772. doi: 10.3934/matersci.2016.4.1759

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This article has been cited by:

1. Mehdi Zomorodian, Guang Yang, Abdeldjelil Belarbi, Ashraf Ayoub, Behavior of FRP-strengthened RC elements subjected to pure shear, Construction and Building Materials, 2018, 170, 378, 10.1016/j.conbuildmat.2018.03.004
2. Masoud Dehghani Champiri, Mir Mohammad Reza Mousavi, Kaspar Jodok Willam, Bora Gencturk, Effect of Alkali-Silica Reactivity Damage to Tip-Over Impact Performance of Dry Cask Storage Structures, International Journal of Concrete Structures and Materials, 2018, 12, 1, 10.1186/s40069-018-0248-5

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Copyright Info: 2016, Masoud D. Champiri, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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