A multiscale experimental approach for correlating global and local deformation response in woven composites

作者：Koohbor Behrad; Ravindran Suraj; Kidane Addis^*

来源：Composite Structures, 2018, 194: 328-334.

DOI：10.1016/j.compstruct.2018.04.016

• Polymer-matrix composites
• Micro-mechanics
• Multiscale
• Digital image correlation

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.

• 出版日期2018-6-15