1,721,076 research outputs found
21th International Conference on Composite Structures (ICCS21)
No full textIt is well-known that the topic of composite materials affects many engineering fields, such as civil, mechanical, aerospace, automotive and chemical. In the last decades, in fact, a huge number of scientific papers concerning these peculiar constituents has been published. Analogously, the industrial progress has been extremely noticeable.
The study of composite materials, in general, is a challenging activity since the advancements both in the academia and in the industry provide continually new sparks to develop innovative ideas and applications. The communication, the sharing and the exchange of views can surely help the works of many researchers. This aspect represents the main purpose of this Conference, which aims to collect high-level contributions on the development and the application of composite materials.
The establishment of this 21st edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Bologna (Italy), selected plenary and key-note lectures have been collected in the present book.
The conference attracted 350+ delegates from around the world of composites. The plenary lectures were given by, Johannes Michael Sinapius (Technische Universität Braunschweig, Germany), Aurelio Araujo (University of Lisbon, Portugal), Francesco Tornabene (University of Bologna, Italy), Andreas Echtermeyer (NTNU-Norwegian University of Science and Technology, Norway), Raimondo Luciano (University of Cassino and Southern Lazio, Italy).
The Conference Chair: Antonio J.M. Ferreira (University of Porto, Portugal), Francesco Tornabene (University of Bologna, Italy), Nicholas Fantuzzi (University of Bologna, Italy), Erasmo Viola (University of Bologna, Italy).
The Local Organizing Committee: Michele Bacciocchi (University of Bologna, Italy)
The G.D.Q. method for the harmonic dynamic analysis of rotational shell structural elements
No full textThis paper deals with the modal analysis of rotational shell structures by means of the
numerical solution technique known as the Generalized Differential Quadrature (G. D. Q.) method. The
treatment is conducted within the Reissner first order shear deformation theory (F. S. D. T.) for linearly
elastic isotropic shells. Starting from a non-linear formulation, the compatibility equations via Principle of
Virtual Works are obtained, for the general shell structure, given the internal equilibrium equations in
terms of stress resultants and couples. These equations are subsequently linearized and specialized for the
rotational geometry, expanding all problem variables in a partial Fourier series, with respect to the
longitudinal coordinate. The procedure leads to the fundamental system of dynamic equilibrium equations
in terms of the reference surface kinematic harmonic components. Finally, a one-dimensional problem, by
means of a set of five ordinary differential equations, in which the only spatial coordinate appearing is the
one along meridians, is obtained. This can be conveniently solved using an appropriate G. D. Q. method
in meridional direction, yielding accurate results with an extremely low computational cost and not using
the so-called “delta-point” technique
Higher-Order Theories for Structural Analysis of Doubly-Curved Shells with Variable Mechanical Properties
No full textThe static and dynamic behavior of several shell structures is affected by their mechanical properties. In particular, the natural linear frequencies can be subjected to a considerable variation by placing the reinforcing fibers along curvilinear paths or assuming variable thickness in the whole domain. Similarly, if a static problem is considered, the stress and strain profiles along the thickness of the structure, as well as the three-dimensional displacements, can show different trend varying the fiber orientation. Therefore, the mechanical behavior of doubly-curved structures shows more and more changes combining this kind of layers, characterized by variable properties, with classic orthotropic plies or with a soft-core. Nevertheless, the use of such laminated composite materials does not allow to employ the well-known first-order shear deformation shell theories anymore due to the strong anisotropic behavior. Hence, higher-order Equivalent Single Layer formulations and Layer-Wise models have to be introduced for this purpose. In the same way, the geometric parameters are assumed variable in each point of the domain. The study of doubly-curved shells with variable radii of curvature and variable thickness can take place once the geometric description is performed accurately by using the differential geometry principles. In order to solve numerically all these problems, the Generalized Differential Quadrature method is introduced. Several applications and numerical results are shown to exhibit the accuracy of the present technique
3rd International Conference on Mechanics of Composites (MECHCOMP3)
No full textThe use of composite materials has grown exponentially in the last decades and has affected many engineering fields due to their enhanced mechanical properties and improved features with respect to conventional materials. For instance, they are employed in civil engineering (seismic isolators, long-span bridges, vaults), mechanical engineering (turbines, machine components), aerospace and naval engineering (fuselages, boat hulls and sails), automotive engineering (car bodies, tires), and biomechanical engineering (prostheses).
Nevertheless, the greater use of composites requires a rapid progress in gaining the needed knowledge to design and manufacture composite structures. Thus, researchers and designers devote their own efforts to develop new analysis techniques, design methodologies, manufacturing procedures, micromechanics approaches, theoretical models, and numerical methods. For these purpose, it is extremely easy to find many recent journal papers, books, and technical notes, focused on the mechanics of composites. In particular, several studies are presented to take advantage of their superior features by varying some typical structural parameters (such as geometry, fiber orientations, volume fraction, structural stiffness, weight, lamination scheme).
Therefore, this Conference aims to collect contributions from every part of the globe that can increase the knowledge of composite materials and their applications, by engaging researches and professional engineers and designers from different sectors. The same aims and scopes have been reached by the previous editions of Mechanics of Composites International Conferences (MECHCOMP), which occurred in 2014 at Stony Brook University (USA) and in 2016 at University of Porto (Portugal).
The third edition of the Conference at University of Bologna (Italy) attracted more than 450 delegates from around the world of composites. The plenary lectures were given by Fernando Fraternali (University of Salerno, Italy), Marco Gigliotti (Université de Poitiers and Ecole Nationale Supérieure de Mécanique et Aérotechnique, Poitiers, France), Salvatore Russo (IUAV University of Venice, Italy), Gaetano Giunta (Luxembourg Institute of Science and Technology (LIST), Luxembourg), Alberto Milazzo (University of Palermo, Italy), Christophe Bouvet (Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-supaéro) and Institut Clément Ader (ICA), France).
The Conference Chair: Antonio J.M. Ferreira (University of Porto, Portugal), Erasmo Viola, Francesco Tornabene and Nicholas Fantuzzi (University of Bologna, Italy).
The Local Organizing Committee: Michele Bacciocchi (University of Bologna, Italy)
Free surface boundary conditions for spilling waves: theoretical approach and numerical implementation
No full textThe recent advancement of numerical modeling has given valuable insights in the
knowledge of wave transformation and interaction with coastal structures. In particular, the twophase
flow formulation gives advantages towards a more accurate reproduction of the processes
and a deeper understanding of the dynamics developing at wave breaking, where an aerated
splashing regime is observed. However, such an approach is found to be computationally
expensive, especially in the case of large-scale analyses. Aim of the present paper is to describe a
novel single-phase numerical model where the adopted free surface boundary conditions take into
account the multiphase mixing layer forming at surface deformation. Preliminary comparisons
with available data on hydraulic jumps, stationary counterparts of bores, reveal good performances
of the model
Flexible multibody model of a motorbike timing system.
No full textThis paper describes a flexible multibody model of the Ducati Moto GP timing system. The model is developed by means of the Ricardo’s commercial software VALDYN.
The aim of the work is to provide the designers and the analysts of the Ducati company with a useful tool for the optimization of the engine dynamic behaviour. The predictive model of the system was developed and validated by means of experimental tests. The comparison between the simulation results and the experimental data proves the effectiveness of the model. Several examples of model applications are presented
An orthotropic multi surface yield with damage model for 3D FEM analysis of adhesively bonded wood steel elements
No full textModellazione mediante elementi distinti particellari delle prove sui materiali granulari
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