Within the Network of Excellence MARSTRUCT a round robin was carried out in which three different structural details were assessed by calculating hot-spot stresses or one case effective notch stresses. The first detail deals with stress increase at thickness steps plate structures. For two cases is determined types models. second penetration longitudinal through bulkhead four hot-spots. third assessment root failure single-sided fillet welds. welded joint end connection rectangular hollow...

This paper describes experimental and numerical techniques to study the structural design of double lap shear joints that are based on thick-adherend steel/steel steel/composite, with epoxy adhesive. A standard practical fabrication method was used produce specimens various dimensions materials. These consist 10 mm steel inner adherend outer materials including composite thicknesses overlaps. The is largely carbon fibre-reinforced plastic. were tested under monotonic tensile loading results...

This paper addresses the dynamic torsion behaviour of ship hull with very large open decks. A short overview past research is presented, and several key findings behavioral characteristics are discussed. In paper, author focusing on part a new macroelement model used for analysis made composite materials. The numerical (using two methods, one them being proposed method) experiments developed simplified typical container ship. performed scale ship, layered plates, first 5 natural frequencies...

In this paper the influence cell honeycomb geometry on mechanical behaviour of a composite sandwich plate is analyzed. Three geometries (circular, hexagonal and square) are static analysed so that to select best type will be used in manufacturing core. The main aim develop approach models equivalent orthotropic materials replace real model core with their properties quickly calculate made out when finite element analysis code. Geometry material delivered by provider. Comparative analysis,...

Sandwich panels with composite/steel skin sheets and foam core are very often used as lightweight structures in automotive, maritime aerospace applications due to their performances like high bending stiffness strength also lightweight. As an alternative classical structural reinforced panels, the sandwich justifying use various industrial fields, making these less complex, by eliminating need for secondary stiffening. In paper presented three models of sandwich, steel-foam-steel,...

Magnetorheological elastomers (MREs) are a kind of smart materials, which change the mechanical properties (viscoelastic characteristics) under magnetic field action. In paper determination damping (reactive force) specimens made out magnetorheological is presented. The MREs have been fabricated as composite with matrix silicone rubber certain contents magnetisable particles (carbonyl iron powder). cylindrical tested in compression loading, controlled by an electro-mechanic system. MRE...

The dynamic behavior of bebonded sandwich plates at the skin/core interface is analysed. finite element code COSMOS/M used to analyse natural frequencies and mode shapes with a ellipse shape debonding area. delamination model has been developed by using surface-to-surface contact option. In case contact, FE meshes adjacent plies do no need be identically. influence diameters ratio debonded area, on modal parameters clamped investigated. Parametric calculus plate, having various ratios (Dx/Dy...

Abstract To prepare for a transient analysis of damaged ship, mesh independence test was carried out on an open channel free surface simulation with fluid-solid interaction. The numerical methods applied, the sizing and method, as well several other parameters which might influence results were adjusted to obtain comparisons establish proper solution upcoming simulation. Compared data includes drag force, dynamic total pressure applied solid, maximum elevation at solid domain.

Abstract The modernization of the Danube IWT fleet involves developing needed know-how for retrofitting Romanian in accordance with Stage V emissions legislation. end goal is achieving lower air pollutant by increasing efficiency, lowering energetic needs and decreasing environmental footprint fleet. following paper presents principles design-for-retrofitting methodology developed inland ships. technologies involved aim at improving efficiency after-treatment meeting requirements.

The mechanical properties of certain flexible core materials ship structure sandwich panels, having skins made metallic or composite laminates maybe significantly influenced by the temperature variations that may occur during operational loading. At same time, improving knowledge behaviour these panels in terms bending strength and other stress/strain related aspects various harsh conditions increases their superiority weight-to-strength ratio, high stiffness, easy to manufacture, acoustic,...

In this paper, results obtained on buckling behavior of ship deck plates made composite materials are presented. The fabrication technologies used in structures mostly based the hand made. So, probability to occur material imperfections is too high. influence characteristics panels analyzed. so by numerical and experimental analysis with initial transversal compared for steel, having same type imperfections.

A new methodology based on a macroelement model proposed for torsional behaviour of the ship hull made composite material is in this paper. computer program has been developed elastic analysis linear torsion. The results are compared with FEM‐based licensed soft COSMOS/M and measurements scale simplified container ship, materials.

The paper addresses the study of damping characteristics estimation and behaviour magnetorheological elastomers (MREs) in absence magnetic field. This type material actively changes size, internal structure viscoelastic under external influences. These particular composite materials whose can vary presence a fields are known as smart materials. feature which causes variation properties is explained by existence polarized particles change form energy absorbing. Damping special characteristic...

The paper presents a study on the stresses and deformations induced by transversal loading of some flat plates made E Glass EWR Fiberglass Woven Roving type, having delamination type defects. parametric analysis influence displacements occurring in plate material is performed. results static calculation are compared with experimental tests subjected to bending, highlighting concordance variation versus position position.

The paper is focused on the structural problems related to retrofitting of a ship structure into maritime self-elevating platform. study referred design global and local strengthening platform legs structures. joint built as connection between hull tubular legs, designed so that be acted by special actuators. total force provided actuators during lifting operations necessary balance weight operating equipment. work described in shows methodology for FEM strength calculation using...

The paper is focused on the ship hull safety problems related to longitudinal strength of during design, construction and service in context International Goal-Based Ship Construction Standards carried out by Maritime Organization (IMO). study underscores importance for prevention theirs losses, mentioning most important measures taken IMO improvement safety. In work, a critical analysis methodology Association Classification Societies (IACS) calculation sectional efforts induced waves...

In this paper, numerical and experimental studies on the influence of thermal field behavior structure sandwich plates in three points bending is analysed. Various materials are used so for skins. For core only extruded polystyrene, with various thicknesses used. The conductivity n was determined by using Hilton B480 unit, based heat flowmeter method described ISO 8301:1991. We have been analyzed 12 cases composite structures. results obtained determination simulation all modeling compared...