The effect of using multiple materials within hexagonal and re-entrant (auxetic) cellular structures was investigated. For each topology, three different material configurations including (a) Nylon, (b) Carbon fibre reinforced Nylon (c) Glass were used. A numerical model constituted to imitate the compressive behaviour these multi-material under quasi-static loading. validation, samples printed with Fused Filament Fabrication (FFF) technique experimentally tested. good correlation captured...

Auxetic cellular structures have the potential to revolutionise sandwich panel cores due their superior energy absorption capability. Because of negative Poisson's ratio, auxetics behave counterintuitively and contract orthogonally under an applied compressive force, resulting in a densification material vicinity load. This study investigates three compares absorbing characteristics in-plane axial loading conditions. Three unit cell topologies are considered; conventional hexagonal,...

This study examines the impact of three factors on tensile and compressive behaviour 3D-printed parts: (1) addition short carbon fibres to nylon filament used for 3D printing, (2) infill pattern, (3) speed at which materials are strained during testing. The results show that adding reduces variability between tests emphasises effect print orientation. When pattern is aligned with direction loading, strength all samples increases, largest increase 100% observed in fibre-reinforced samples,...

The layered structures exhibit a weakly singular stress state in the vicinity of free edges, attributable to elastic mismatch adjacent plies, thereby promoting delamination. In present study, this so-called edge effect is investigated for symmetric angle-ply laminates framework Finite Fracture Mechanics (FFM). For given intrinsic properties, such as fracture toughness and strength, computation interlaminar stresses energy release rate imperative evaluation coupled FFM criterion. These...

In the present study, a comparative compression investigation of anti-tetrachiral and modified re-entrant lattices was conducted in-plane direction using experimental numerical analyses. Lattice structures were manufactured fused deposition modelling 3D printing technology crushed at quasi-static condition. Nonlinear finite element (FE) models both established, FE results systematically compared with results. The onset densification phases determined numerically. Results indicate that...

There is no native support for the modeling of woven fabric composites within Abaqus. A new approach has been implemented Abaqus, which shown to be robust and capable across a range loading conditions. This predicted bending modulus displacement at failure carbon-fiber under three-point standard deviation experimental results. Under high-velocity impact loading, critical perforation velocity aramid panels was 3% results, while back face deformation error.

Traditional approaches that rely on stress or energy-based criteria to predict delamination require the determination of stresses before crack onset energy release rates after initiation, respectively. While a relatively new coupled criterion, Finite Fracture Mechanics, necessitates computation both and rates. This study discusses numerical interlaminar semi-elliptical cracks emanating at free edge in carbon fibre-reinforced polymer materials. The method establishes semi-analytical...

Abstract The material mismatch between the dissimilarly oriented plies within laminated structures induces localised singular interlaminar stresses at free edges, under various loading conditions such as mechanical, moisture, or thermal. These lead to premature cracking. This study introduces application of Finite Fracture Mechanics (FFM) for predicting edge delamination in angle-ply laminates uniform thermal loading. current framework assumes nucleation semi-elliptically shaped crack...

A novel 3D printing methodology using continuous carbon fiber (CCF) reinforced thermosetting epoxy (EP) composites was proposed to fabricate triangular corrugated structures (TCSs). The single-stroke path ensured a strong connection between the core and face sheets. Silicone rubber deposited vulcanized solve shape retention problem of preformed sample during post-curing. Flatwise compression tests were conducted evolution stress-strain curves upon deformation discussed as well. Particular...

A variety of 3D printing parameters have been investigated including reinforcement material and print orientation, as well pattern, distribution volume. From these evaluated parameters, the optimal values are taken into account to select highest compressive properties. By using Scanning Electron Microscopy (SEM) imaging, thermoplastic layers clearly identified alongside sample flaws. Horizontally printed samples exhibited higher mean with less standard deviation than vertically ones for...

This research deals with the derivation and solution of nonlinear dynamic equations a clamped laminated plate exposed to blast load including structural damping effects. Dynamic are derived by use virtual work principle. The geometric nonlinearity effects taken into account von Karman large deflection theory thin plates. An appropriate approximate is assumed for space domain considering finite element analysis results deformation static plate. Galerkin method used obtain differential in time...

In this study, the geometrically nonlinear dynamic behaviour of simply supported tapered laminated composite plates subjected to air blast loading is investigated numerically. In-plane stiffness, inertia and geometric nonlinearity effects are considered in formulation problem. The equations motion for plate derived by use virtual work principle. Approximate solution functions assumed space domain substituted into motion. Then, Galerkin method used obtain algebraic differential time domain....

In this study, the nonlinear dynamic response of a hybrid laminated composite plate composed basalt, Kevlar/epoxy and E-glass/epoxy under blast load with damping effects has been investigated. The von Kármán type geometric nonlinearities are taken into account rectangular is assumed to be simply supported on all edges. Galerkin Method used obtain differential equations in time domain, those solved by Finite Difference Method. Parametric studies conducted. influences some parameters such as...