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Keyword : structural design
Results 1 - 5 of 152
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.
The Paper Boat: Building a Composite Optimist Dinghy with Cellulose Fiber and Epoxy Matrix
The purpose of this paper is to explore the opportunities to use cellulose as a replacement material for glass fiber in composites for boats, and as a demonstrator build a composite Optimist dinghy with cellulose fiber and epoxy matrix. Chemical modification of cellulose fibers was performed to enhance the adhesion to LDPE polymer. The adhesion was improved by chemical modification of the fibers but at the same time the fibers lost their strength which resulted in reduced mechanical properties. Since composites with unmodified fibers showed the best mechanical performance the continuation of the work was changed to fluff-pulp as reinforcement. The produced cellulose-thermoset material showed similar mechanical properties as glass fiber-thermoset. The result of the demonstrator was an Optimist dinghy that has proven its life at sea several times, as The Paper Boat.
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.