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Keyword : structural loads
Results 1 - 5 of 24
An Analytical Approach to Estimate the Compressive Strength of Carbon Fibre Reinforced Plastics
This study deals with the estimation of the compressive strength of carbon fibre reinforced plastics composites used in yacht racing. This property is one the key design parameters in marine engineering. The mechanism of fibre micro-buckling as well as a structural effect including the neighbouring plies of the unidirectional ply and the deformation gradient linked to the the mechanical loading are taken into account to propose an analytical model for estimating this property. The parameters involved require a number of experiments to characterise the microstructure at the level of components (fibre, matrix, ply) and the mechanical behaviour (elastoplasticity). Some of them can be estimated using a micro-mechanical approach. It is shown that estimations and experiments show good agreement on two cases: one with a constant deformation gradient, the other one in pure compression. The paramount influence of the initial misalignment of the fibre is highlighted.
Hull - Furniture Interaction in the Primary Response to Global Loads of a Sailing Yacht
The aim of this work is to investigate the contribution of those “non-structural” components to the hull strength in order to evaluate their effect on the stress and deformation distribution of a large sailing yacht. Two different finite element models of a 94 ft sailing yacht, with and without “non structural components”, have been carried out with a very high level of detail in order to evaluate the outfit and furniture contribution to the primary hull response.
Running aground with a sailing yacht can result in significant damage to the structures of a yacht; particularly at high speeds. The prediction of grounding forces and an associated maximum speed is therefore an important precaution measure to remain inside the structural design envelope; to obtain robust structures at predictable grounding scenarios. Since current classification rules do not explicitly regard the vessel’s speed, an improved method of predicting grounding forces is desired. The aim of this work is to investigate the forces that act on a sailing yacht during grounding. A nonlinear finite element analysis of a large sailing yacht is performed, that accounts for plastic deformation of the keel bulb, elastic deformation of the keel fin and hull as well as hydrostatic restoring forces. The influence of the yacht’s initial velocity, draft and ballast/displacement ratio is investigated. Furthermore, the grounding force experienced by a yacht with a crashworthy bulb is examined.
New Methodology of Bending Fatigue Test and Slamming Test on PVC Foam Core Sandwich with GFRP Faces
The purpose of this study is to investigate the influence of a spatially moving load and edge effects on the fatigue life of the foam-cored sandwich structures. A spatially moving load can be observed in structures subjected to slamming. A new geometry of specimen is developed to reduce the influence of edge effects in the test specimen. Numerical model results of the new geometry are presented. This study confirms that edge effects are leading to early failures and shear stress concentrations are significantly reduced near the edges, improving ASTM C393 standard.
Insights from the Load Monitoring Program for the 2014-2015 Volvo Ocean Race
This paper describes insights into keel and rigging loads
obtained through a data acquisition system fitted on the
fleet of Volvo 65 yachts during the 2014-2015 Volvo
Ocean Race. In the first part, keel fin stress spectra are
derived from traces of canting keel ram pressures and keel
angle; these are reviewed and compared against equivalent
spectra obtained by applying methods proposed by Det
Norske Veritas - Germanischer Lloyd (“DNVGL”)
guidelines and the ISO 12215 standard. The differences
between stress spectra and their validity are discussed,
considering two types of keel: milled from a monolithic
cast of steel, and fabricated from welded metal sheets. The
second part discusses predicted and actual rigging working
loads for the Volvo 65 yachts, and considers how safety
factors vary between design loads proposed by DNVGL
and actual recorded loads.