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Understanding global mechanical response of fiber reinforced cementitious composite beams from local fracture process
Author(s) -
Sanal Irem
Publication year - 2018
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2202
Subject(s) - durability , structural engineering , fracture (geology) , materials science , digital image correlation , fracture mechanics , cracking , bending , structural health monitoring , cementitious , damage tolerance , structural material , composite material , composite number , engineering , cement
Summary Cracking of the concrete structures is the major problem in the structural health and durability, and there is a critical need for continuous monitoring and assessing structural integrity. In order to monitor structures, traditional sensors are being used, which have some drawbacks, such only taking recording at specifically determined points. However, it has been shown that unless any existing damage is located at a point of high stress or has severely compromised the integrity of a structure, damages might be undetected. In order to have a more detailed understanding on the behavior of fiber‐reinforced concretes (FRC), their mechanical performance should be evaluated together with local fracture phenomena, such as crack propagation and localization. Because cracking is a major problem in the design and durability of structural elements. In this paper, propagation of cracks in FRC beams under 4‐point bending test is analyzed in detail with an image processing technique, Digital Image Correlation (DIC). DIC technique is applied to further identify fracture parameters such as crack width evolution and crack patterns at different stages of loading, which enables a detailed evaluation of the relationship between fracture parameters and resulting mechanical performance. Therefore, the main aim of this study is to enable the translation of global mechanical response of the FRC beams from the local fracture process, with a detailed characterization of cracks both experimentally and also with DIC analysis, which can be used for structural health monitoring of FRC beams, in terms early stage crack determination and crack monitoring through the lifetime.