Abstract A clearer insight into the ‘shear locking’ phenomenon, which appears in development of C 0 continuous element using shear‐flexible or penalty type formulations, is obtained by a careful study Timoshenko beam element. When argument used to degenerate thick elements thin elements, various approximations shear related energy terms act as different types constraints and, depending on formulation, two are classified true spurious may emerge. The constraints, where they exist, responsible...

We have used quasi-static equations of piezoelectricity to derive a finite element formulation capable modelling two different kinds piezoelastically induced actuation in an adaptive composite sandwich beam. This is made couple certain piezoelectric constants transverse electric field develop extension-bending and shear-induced actuation. As illustration, we present model three sublaminates: face/core/face. control scheme based on the linear quadratic regulator/independent modal space...

Abstract Early attempts to derive curved beam and shell elements in a curvilinear system were dramatically unsuccessful. This was wrongly attributed the failure of these recover strain‐free rigid body displacement modes co‐ordinate description. Recent evidence points ‘membrane locking’ phenomenon that arises when constrained strain fields corresponding inextensional bending are not ‘consistently’ recovered. accounts for, more completely precisely, such elements. In this paper, simple linear...

Abstract In this paper, an attempt is made to understand the errors arising in curved finite elements which undergo both flexural and membrane deformations. It shown that with of size (i.e. a practical level discretization at reasonably accurate results can be expected), there special nature arise because strain fields are not consistently interpolated terms from two independent field functions characterize such problem. These lead errors, described here as ‘second kind’ physical phenomenon...

Abstract A three‐noded curved beam element with transverse shear deformation, based on independent isoparametric quadratic interpolations, is designed from field‐consistency principles. It shown that a field‐inconsistent in membrane strain suffers ‘membrane locking’—i.e. an error of the second kind propagates indefinitely as length to thickness ratio and/or radius curvature increase, nearly inextensional bending. However, field‐inconsistency does not lead ‘shear locking’ but degrades its...

Abstract A clearer understanding of the problems associated with reduced integration and optimum schemes for development Mindlin plate elements is presented. It shown that an optimal selective rule can be found 4‐node quadrilateral bending element which requires 2 × Gaussian energy 1 rules shear terms from (θ x − w , ) y ), respectively. This will give correct rank, without any zero mechanisms locking in thin limit, better performance moderately thick situations than currently available...

An inaugural Global Knowledge Index (GKI) has been released to the public recently. This is a joint exercise between United Nations Development Programme (UNDP) and Mohammad Bin Rashid Al Maktoum Foundation (MBRF), Dubai. first edition profiled 7 sectors in 131 countries intended help as guide track knowledge wealth for stronger nation-building achieving sustainable development.

A coupled piezoelectric field is modelled with an expansion strain in the numerical formulation to analyse piezohygrothermoelastic laminated plates and shells. Finite element actuator sensor equations are derived using a nine-noded consistent shallow shell element. Thermally induced vibration control attempted piezoelectrically developed active damping. The influence of anisotropy on damping evaluated, adopting simple modelling technique. With 40% reduced actuation capability lateral...

Abstract A curved three‐noded quadratic isoparametric axisymmetric thick shell element is developed. Field‐consistency interpretations allow various configurations of the to be designed so as satisfy specific problem needs. Typical applications demonstrate versatility and accuracy this in its different problem‐specific forms.

Abstract A shear flexible (i.e. Timoshenko) quadratic isoparametric beam element with two degrees of freedom per node is critically examined from the point view consistency constrained strain fields that arise in thin‐beam limits. The errors, terms convergence displacement and violent oscillations stress fields, emerge when exactly integrated elements are used predicted a priori confirmed numerical experiments. rationale behind use optimal sampling at Gaussian points also derived directly...

Introduction T HE early development on the topic of nonlinear vibrations isotropic circular cylindrical shells is well documented by Evensen. In 1976, Raju and Rao presented a finite-element solution, Evensen commented that authors had ignored physics problem thin bend more readily than they stretch. Subsequently, Prathap pointed out some inconsistencies in mathematical analysis carried also physical behavior three-term model Dowell Ventres. The comments made Ref. 4 led to reinvestigation...

In his recent paper, Vinkler (2013, p. 1085) comes to the conclusion that "substantial theoretical work and several case studies are needed arrive at a widely acceptable solution concerning characterization of eminence publications scientists teams, both qualitatively quantitatively, by single indicator." The quantity part is represented number papers, P, in publication set (for team or individual scientist), quality impact, i = C/P, where C total citations received P papers. I argue that,...