Interior strain analysis of a woven composite beam using X-ray computed tomography and digital volumetric speckle photography. (15th December 2015)

• Record Type: Journal Article
• Authors: Mao, Lingtao; Chiang, Fu-pen
• Is Part Of: Composite structures. Volume 134(2016)
• Page Start: 782
• Page End: 788
• Publication Date: 2015-12-15
• Subjects: Interior strain in composite -- Digital volumetric speckle photography -- Digital volume correlation -- Digital speckle photography; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2015.08.129
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: Materials such as fiber reinforced composite are inherently 3D in nature. Its internal stress/strain fields are very complex even under the simplest loading condition. There is no effective means of measuring interior strain other than placing isolated sensors. In this paper we introduce a new strain measuring technique called digital volumetric speckle photography whereby we can probe the interior strain field in a whole field manner. We apply it to the determination in a woven fiber composite beam under 3-point bend. The in-plane strain field of three transverse sections and two longitudinal sections are determined using the technique. In addition we show that one of the principal strain fields of the mid-longitudinal section tends to predict the impending failure of the beam.