A multiscale experimental approach for correlating global and local deformation response in woven composites. (15th June 2018)

• Record Type: Journal Article
• Authors: Koohbor, Behrad; Ravindran, Suraj; Kidane, Addis
• Is Part Of: Composite structures. Volume 194(2018)
• Page Start: 328
• Page End: 334
• Publication Date: 2018-06-15
• Subjects: Polymer-matrix composites -- Micro-mechanics -- Multiscale -- Digital image correlation; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2018.04.016
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: A multiscale experimental approach is introduced that facilitates correlating globally applied stress to the local material response at yarn scale. Using a high-resolution optical digital image correlation, low and high strain zones in off-axis woven composite samples loaded in uniaxial tension are identified and the corresponding full-field strains are quantified. The local strain response quantified over low and high strain domains are used along with the continuum scale deformation to establish a correlation between global and local deformation behavior as a function of fiber orientation. In addition, global stress-local strain curves are extracted for low and high strain domains at different fiber orientation angles. A simple plasticity model in conjunction with the obtained stress-strain curves is implemented and utilized to develop a phenomenological model that enables correlating global stress with the locally developed strain at different locations in a composite specimen subjected to off-axis tensile load.