Acoustic Emission-Based Analysis of Damage Mechanisms in FilamentWound Fiber Reinforced Composite Tubes

This study investigates the mechanical behavior and damage mechanisms of thin-walled glass/epoxy filament wound tubes under quasi-static lateral loads. The novelty is that the tubes are reinforced in critical areas using strip composite patches to provide a topology-optimized tube, and their damage mechanisms and mechanical performance are...

Burst Pressure Prediction of Cord-Rubber Composite Pressure Vessels: Using Global-Local Nonlinear Finite Element Analysis

This project aims at developing a model to predict the damage initiation and propagation in a cylindrical filament-wound cord-rubber structure under internal pressurization using non-linear FEA, and is conducted in cooperation with TANIQ BV, Netherlands.<br/>Cord-reinforced rubber composites are used in several safety-critical industries such as...

Lightweight design of variable-angle filament-wound cylinders combining Kriging-based metamodels with particle swarm optimization

Variable-angle filament-wound (VAFW) cylinders are herein optimized for minimum mass under manufacturing constraints, and for various design loads. A design parameterization based on a second-order polynomial variation of the tow winding angle along the axial direction of the cylinders is utilized to explore the nonlinear steering-thickness...

Lightweight Design of Variable-Stiffness Cylinders with Reduced Imperfection Sensitivity Enabled by Continuous Tow Shearing and Machine Learning

The present study investigates how to apply continuous tow shearing (CTS) in a manufacturable design parameterization to obtain reduced imperfection sensitivity in lightweight, cylindrical shell designs. The asymptotic nonlinear method developed by Koiter is applied to predict the postbuckled stiffness, whose index is constrained to be...

Development of a Computationally Efficient Modelling Framework for Type IV Pressure Vessels

The combination of a relatively recent emissions scandal and the ever growing incentive to provide sustainable transportation solutions, led to the fact that the transition to electrically propelled land-based vehicles is more prominent than ever. All prominent European car-makers announced diverse fully and partially electric product portfolios...

Design, modeling, optimization, manufacturing and testing of variable-angle filament-wound cylinders

This work demonstrates the potential of manufacturing variable-angle composite cylinders via filament winding (FW), called VAFW. The proposed design strategy allows different filament angles along the axial direction by dividing the cylinder into regions of constant angle called frames. Designs using two, four, or eight frames are herein...

Measuring geometric imperfections of variable–angle filament–wound cylinders with a simple digital image correlation setup

Measuring the geometric imperfections in cylindrical shells is a critical step necessary to create accurate numerical models that can capture the imperfection-sensitive behavior of these structures. Modern composite structures, such as variable–angle filament–wound (VAFW) cylinders, have a unique imperfection signature that is still unknown to...

Reliability-based buckling optimization with an accelerated Kriging metamodel for filament-wound variable angle tow composite cylinders

A reliability-based optimization framework is introduced and used to design filament-wound cylindrical shells with variable angle tow. Seven design cases are investigated to enable a comparison between constant-stiffness and variable angle tow designs, also considering effects of thickness variation created due to overlapping tow paths,...

Analysis Methodologies for As-Manufactured Composite Pressure Vessels

Type IV composite pressure vessels (CPVs) are used commercially for the gaseous storage of hydrogen in fuel cell electric vehicles (FCEVs). However, their economic implementation requires material optimization and a reliable prediction of the vessel strength. In this regard, their burst when loaded under internal pressure is impacted by the...

Experimental and Numerical Investigation into the Influence of Layup Sequence on the Mechanical Performance of Composite Pressure Vessels for H₂ Storage

Fuel cell electric vehicles can provide the possibility to meet CO₂ emission reduction targets, but these vehicles require cost effective energy storage solutions. The current most mature technology uses compressed hydrogen, stored in composite pressure vessels (CPVs) manufactured by filament winding. Structural optimization of CPVs...

Two-matrix composites: Carbon fiber micropultrusions embedded in flexible epoxy matrices

Two-matrix composites combine fibers with two distinct matrices. This is achieved by impregnating fiber bundles with a high-stiffness matrix and embedding the cured bundles in a flexible matrix. Two-matrix composites have been shown to offer unprecedented combinations of transverse flexibility and longitudinal tensile strength, and could offer...

Amsterdam Plaza: The new station of Amsterdam South

The Amsterdam South station area is at the very beginning of a huge transformation. Since the station and highway, situated directly next to each other, cannot manage the amount of travellers and cars anymore, both have to expand. Unfortunately, the lack of space makes it impossible for both expansions at the same level. So a solution has to be...

A filament wound pillar for a pedestrian bridge

This report describes the research done on the possibilities of a structural element in the built environment made using the ‘coreless’ filament winding composite forming technique. The focus lies with the combination of a loadbearing capacity and an aesthetic value specifically derived from this production technique. This is done by the design...

Design and Optimization of Filament Wound Composite Pressure Vessels

One of the most important issues for the design of filament-wound pressure vessels reflects on the determination of the most efficient meridian profiles and related fiber architectures, leading to optimal structural performance. To better understand the design and optimization of filament-wound pressure vessels, in this dissertation we present...

Filament Winding. A Unified Approach

In this dissertation we have presented an overview and comprehensive treatment of several facets of the filament winding process. With the concepts of differential geometry and the theory of thin anisotropic shells of revolution, a parametric shape generator has been formulated for the design procedure of optimal composite pressure vessels in...