Alfonso Pagani
City University London
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Featured researches published by Alfonso Pagani.
Mechanics of Advanced Materials and Structures | 2016
Erasmo Carrera; Alfonso Pagani; J.R. Banerjee
Abstract This article introduces a one-dimensional (1D) higher-order exact formulation for linearized buckling analysis of beam-columns. The Carrera Unified Formulation (CUF) is utilized and the displacement field is expressed as a generic N-order expansion of the generalized unknown displacement field. The principle of virtual displacements is invoked along with CUF to derive the governing equations and the associated natural boundary conditions in terms of fundamental nuclei, which can be systematically expanded according to N by exploiting an extensive index notation. After the closed form solution of the N-order beam-column element is sought, an exact dynamic stiffness (DS) matrix is derived by relating the amplitudes of the loads to those of the responses. The global DS matrix is finally processed through the application of the Wittrick-Williams algorithm to extract the buckling loads of the structure. Isotropic solid and thin-walled cross-section beams as well as laminated composite structures are analyzed in this article. The validity of the formulation and its broad range of applicability are demonstrated through comparisons of results from the literature and by using commercial finite element codes.
Proceedings of the 32nd Technical Conference of the American Society for Composites (ASC) | 2017
A.G. de Miguel; Alfonso Pagani; Wenbin Yu; Erasmo Carrera
A novel approach for the micromechanics analysis of composite structures is developed using refined beam models and the mechanics of structure genome (MSG). The MSG provides a tool to obtain the complete stiffness matrix of general composite materials by asymptotically minimizing the loss of information between the original heterogeneous body and the sought homogenized body. The constitutive information is in this manner extracted from the representative volume without the need of ad-hoc assumptions and in one single loading step. The local fields are then straightforwardly recovered using the same unknowns of the original homogenization problem, with no need of additional analyses. This work proposes the use of higher-order beam models based on the Carrera unified formulation (CUF) to solve the micromechanics problem by means of MSG. The fibers, or equivalent constituents, are discretized along the longitudinal direction with beam elements and the unknown variables are expanded over the remaining two local coordinates making use of Legendre-class polynomial sets, denoted to as Hierarchical Legendre Expansions (HLE). In addition, non-local expansion domains with curved boundaries are defined to capture the exact shape of the constituents independently of the refinement of the model. In this sense, the quality of the approximation is controlled by the polynomial order of the beam model, which is introduced in the analysis as a user input, and the size of the computational problem can be reduced for many typical microstructures with no loss of accuracy.
Composite Structures | 2014
Alfonso Pagani; Erasmo Carrera; J.R. Banerjee; P.H. Cabral; G. Caprio; A. Prado
Computer Methods in Applied Mechanics and Engineering | 2018
A.G. de Miguel; G. De Pietro; Erasmo Carrera; Gaetano Giunta; Alfonso Pagani
XXIV International Conference of the Italian Association of Aeronautics and Astronautics - AIDAA 2017 | 2017
Maria Cinefra; Alberto Garcia De Miguel; Matteo Filippi; C. Houriet; Alfonso Pagani; Erasmo Carrera
SEVENTH INTERNATIONAL CONFERENCE ON THEORETICAL, APPLIED, COMPUTATIONAL AND EXPERIMENTAL MECHANICS (ICTACEM 2017) | 2017
R.B. Bharatia; Prashanta Kr Mahato; Erasmo Carrera; Matteo Filippi; Alfonso Pagani
Archive | 2017
Marco Montemurro; Alfonso Pagani; Giacinto Alberto Fiordilino; Jérôme Pailhes; Erasmo Carrera
ICCM 21 - 21st International Conference on Composite Materials | 2017
Guohong Li; A.G. de Miguel; Alfonso Pagani; Enrico Zappino; Carrera
ADVANCES IN AIRCRAFT AND SPACECRAFT SCIENCE | 2017
Alfonso Pagani; Erasmo Carrera; R. Jamshed
Archive | 2015
Erasmo Carrera; Alfonso Pagani; Rehan Jamshed