In this paper, we present a recently developed progressive damage model for composites (CPDM) that allows the switching between different damage modes during the numerical process to mimic real physical behaviour. The modelled damage modes are ranging from matrix cracking to fibre breakage or delamination. Moreover, the CPDM is flexible in the sense that provides the basic structure to include ...

This study is focused on the influence of a modified matrix glass fiber reinforced laminates, which inherently have different material properties than carbon composites. For this we green epoxy resin with 2.5wt% based fillers (synthesized graphene nanopellets, and milled recycled fibres), were subsequently applied to multifilaments, vacuum cured obtain fiber/epoxy UD laminates. The prepared sam...

Pad cratering test methods have been under development with the emergence of this laminate fracture defect mechanism. In additional to ball shear, ball pull, and pin pull testing methods, the acoustic emission method is being developed to evaluate laminate materials’ resistance to pad cratering. Though the acoustic emission (AE) method has been proven to be able to detect pad cratering, no stud...

This study focuses on using an artificial neural network (ANN) based model for predicting the performance of high strength concrete (HSC) beams strengthened with surface mounted FRP laminates. Eight input parameters such as geometrical properties of the beam and mechanical properties of FRP laminates were considered for this study. Back propagation network with Lavenberg-Marquardt algorithm has...

This work investigates two aspects linked to the nature of feasible domain anisotropic laminates. In first part paper, proofs are given on non-convexity for full and membrane-orthotropic laminates, either in lamination parameters space or polar one. Then, adopting formalism, some particular cases studied, providing analytical expressions new narrower bounds, terms membrane stiffness tensor. For...

The use of fiber reinforced polymers (FRP) for reinforcement of aging and deteriorating concrete members has emerged as a viable and cost effective alternative to traditional repair and strengthening techniques to upgrade deficient structures to meet today’s design standards (Crasto et al., 1996; Myers et al., 2000). The load carrying ability of structures such as beams and columns can be enhan...

In this work, TEMPO cellulose nanofibril (TOCNF) laminates were fabricated using a layup method. Two different TOCNF layers tested, neat and with polyvinyl alcohol (PVA) strengthening aid four epoxy formulations as interlayers for the laminates. Flexural testing showed correlation between presence of stronger (TOCNFs + PVA) in laminate higher flexural strength, bending modulus, work failure. Di...

A general theory of thermally stable anisotropic laminates with bending-extension coupling is presented in the framework of linear thermo-elasticity. It is based upon the use of tensor invariants, found by the polar formalism for bi-dimensional anisotropic elasticity. The extension of the results to moisture absorption effects is also proved.

1 2004 (1) References [1] M. Cho and S. Y. Rhee. Optimization of laminates with free edges under bounded uncertainty subject to extension, bending and twisting. International Journal of Solids and Structures, 41:227–245, 2004. [2] C. Lin and Y. Lee. Stacking sequence optimization of laminated composite structures using genetic algorithm with local improvement. Composite Structures, 63:339–345, ...

The ballistic performance of the lightweight armour systems was examined to obtain an estimate for the V50 and the global damage of the composite plates. All estimates were performed by varying the thickness of ceramic tiles, while maintaining equal areal density of the system. Simulation predictions and trial results is demonstrated both in terms of deformation and damage of the laminates and ...