Khizar Rouf

University of Waterloo | UWaterloo · Department of Mechanical and Mechatronics Engineering

A new hierarchical dual-scale modelling framework is developed for predicting the strain rate-dependent nonlinear deformation response of a unidirectional non-crimp fabric (NCF) carbon fiber/snap-cure epoxy composite. A linear Drucker-Prager model that considers tension–compression asymmetry of the yield surface was used to capture the elastic–plas...

The strain rate-dependent behavior of a unidirectional non-crimp fabric (UD-NCF) carbon fiber/snap-cure epoxy composite loaded along the transverse direction under quasi-static and dynamic conditions was characterized. Transverse tension and compression tests at quasi-static and intermediate strain rates were performed using hydraulic testing machi...

The dynamic in-plane shear stress-strain response of a unidirectional non- crimp fabric carbon fiber/snap-cure epoxy composite was studied by subjecting 30° and 45° off-axis specimens to compression loading at high strain rates. Tests were performed using a compression split-Hopkinson pressure bar apparatus where an approximate axial strain rate of...

The aim of this study was to evaluate the effect of manufacturing induced in-plane tow misalignment and out-of-plane tow crimp on the mechanical properties of a heavy-tow unidirectional non-crimp fabric (UD-NCF) composite. The elastic constants and failure onset (strength) are predicted by employing a multiscale computational approach. Micro-scale...

In the finite element analysis (FEA) of composite structures, shell and beam elements with homogenized material properties are often used to reduce the computational costs and modeling efforts. However, significant loss of accuracy may occur due to constitutive modeling limitations of commercially available software packages for complex mesostructu...

Mechanics of structure genome (MSG) is used to develop an approach for multiscale structural analysis of textile structures. First, MSG is used to predict the properties of yarns having realistic geometry. Then, beam and plate stiffness matrices are predicted based on the yarn and matrix properties using MSG. These beam and plate stiffness matrices...

This study investigated the effect of two-dimensional fabric weaves (plain, twill, and satin) on the vibrational characteristics (natural frequency and damping) of woven carbon/epoxy composites. Natural frequencies of woven composites were measured by experimental modal analysis for plain weave, twill weave, and satin weave composites. The experime...

Mechanics of Structure Genome is extended to provide a novel two-step homogenization approach to predicting the effective properties of textile composites. The first homogenization step (micro-homogenization) deals with determining the effective properties of tows (yarns) from fiber and matrix properties. In the second homogenization step (macro-ho...