1,721,039 research outputs found
On the equivalence of energetic and geometric shear factors based on Saint Venant flexure
No full textA Rational Procedure for the Experimental Evaluation of the Elastic Coefficients in a Linearized Formulation of Biphasic Media with Compressible Constituents
No full textThis article illustrates the specialization to infinitesimal perturbations of the geometrically
nonlinear formulation describing the macroscopic dynamic behavior of
biphasic media presented in (Serpieri and Rosati J Mech Phys Solids 59(4):841–862, 2011)
where, based on Lagrangian mechanics arguments, a consistent mathematical theory of fluidsaturated
poroelastic material is developed accounting for the property that both constituent
materials are microscopically compressible. The primary contribution of this work is
the employment of the linearized model in the development of a general procedure for the
determination of the relevant elastic coefficients on the basis of the data provided by a set
of experimental measures analogous to the one originally considered by Biot and Willis
consisting of a shear test, an unjacketed compressibility test and two jacketed tests in which
drainage is either completely allowed or prevented. The linearization of the formulation is
first presented for a generic configuration in which both phases are undergoing a generic
motion. Subsequently, a specific study is presented on the case that the media is motionless,
homogeneous, and isotropic in the reference configuration, which is typical of common
experimental set-ups for static tests. A numerical example is shown and a general relation
between the elastic coefficients and Biot’s constant is derived which consistently accounts
for the compressibility of all materials
A novel constitutive model of composite materials with unidirectional long fibers: theoretical aspects and computational issues
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Collaborative Leadership and Teachers Wellbeing. Research Strategies and School Governance in the Italian Education Field
No full textThe article deals with the relationship between research methods and strategies of governing in Italian education field. In particular, it relates to the surveys, whose interpretative and methodological machinery colludes with the neo- managerialist re-culturing of education space by embedding new public management ideas and tools within the educational texture. Thus, in order to analyse the generative effects that certain methodological choices can have on producing the field to be inquired, it focuses on the way in which defining unit of analysis, choosing techniques to collect data and aiming to such research objectives contribute to produce the “representation for the field to be governed [...] the techniques to be employed, and the ends to be achieved” (Dean 2010, p. 268) in education field. Our findings show how: the neo-managerialist ‘tyranny of numbers’ (Ball, 2007) - imposed both on education space, and research methods in education field can be refused, because - despite inquiry contexts “governed by numbers” (Ozga, 2009) - readings in line with a democratic perspective can be supplied
Modelling damage, friction and dilatancy on structural interfaces using cohesive-zone models, Proceedings of the 19th UK
No full textVariational Macroscopic Two-Phase Poroelasticity. Derivation of General Medium-Independent Equations and Stress Partitioning Laws
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