Sfoglia per Autore "Giannakopoulos, A. E."
Items 1-20 di 43
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The adhesive contact of a flat punch on a hyperelastic substrate subject to a pull-out force or a bending moment
Zisis, T.; Zafiropoulou, V. I.; Giannakopoulos, A. E. (2011)In the last decade; instrumented macro- and nano-indentation tests have become useful tools for probing mechanical properties of materials. In this context, little in-depth work has been done for soft bio-materials like ... -
Analysis of Knoop indentation
Giannakopoulos, A. E.; Zisis, T. (2011)Knoop indentation tests have long been a standard method for material characterization due to the fact that they provide an easy inexpensive non destructive and objective method of evaluating basic properties from small ... -
Analysis of Knoop indentation of cohesive frictional materials
Giannakopoulos, A. E.; Zisis, T. (2013)During the last decades, pyramid micro and nano-indentation tests such as Vickers, Berkovich and Knoop have been used on cohesive-frictional (pressure sensitive) materials, such as hard metals, glasses and ceramics, and ... -
Analysis of Knoop indentation strain hardening effects
Zisis, T.; Giannakopoulos, A. E. (2011)Knoop indentation tests are a standard method for material characterization due to the fact that they provide an easy, inexpensive non-destructive and objective method of evaluating basic properties from small volumes of ... -
Conical indentation of incompressible rubber-like materials
Giannakopoulos, A. E.; Panagiotopoulos, D. I. (2009)In the last decade, the indentation test has become a useful tool for probing mechanical properties of small material volumes. In this context, little has been done for rubber-like materials (elastomers), although there ... -
The contact problem of a circular rigid punch on piezomagnetic materials
Giannakopoulos, A. E.; Parmaklis, A. Z. (2007)In this project; a general theory for the axisymmetric indentation of piezomagnetic solids by a fiat rigid punch is presented within the context of fully coupled linear model, in the absence of friction or adhesion. It is ... -
Derivation of strain gradient length via homogenization of heterogeneous elastic materials
Triantafyllou, A.; Giannakopoulos, A. E. (2013)We present explicit upper bound estimates of the microstructural length used in simple gradient elasticity. Our model is a two dimensional composite made of circular hard inclusions randomly dispersed in a soft matrix. ... -
Development of Strong Surfaces Using Functionally Graded Composites Inspired by Natural Teeth-A Theoretical Approach
Giannakopoulos, A. E.; Kordolemis, A.; Zisis, T. (2010)In recent years functionally-graded composites have been proposed to develop strong surfaces that can withstand high contact and frictional forces. The present work presents a new graded composite that can be used for the ... -
Development of Strong Surfaces Using Functionally Graded Composites Inspired by Natural Teeth-Finite Element and Experimental Verification
Zisis, T.; Kordolemis, A.; Giannakopoulos, A. E. (2010)Functionally graded materials (FGMs) are composite materials that exhibit a microstructure that varies locally in order to achieve a specific type of local material properties distribution. In recent years, FGMs appear to ... -
Dipolar gradient elasticity of cables
Giannakopoulos, A. E.; Petridis, S.; Sophianopoulos, D. S. (2012)The increasing structural use of cables and cable-systems has given rise to a substantial technical literature concerning their static and dynamic response. However, the majority of these works is based on classical ... -
Dynamic behavior of suture-anastomosed arteries and implications to vascular surgery operations
Roussis, P. C.; Giannakopoulos, A. E.; Charalambous, H. P.; Demetriou, D. C.; Georghiou, G. P. (2015)Background: Routine vascular surgery operations involve stitching of disconnected human arteries with themselves or with artificial grafts (arterial anastomosis). This study aims to extend current knowledge and provide ... -
Elastic and viscoelastic indentation of flat surfaces by pyramid indentors
Giannakopoulos, A. E. (2006)The present work presents the results of frictionless and adhesionless contact of flat surfaces by pyramid indentors. The materials of the contacting solids were modelled as homogeneous and isotropic, linear elastic, as ... -
Erratum: Finite element analysis of discrete circular dislocations (CMES (2010) 60: 2 (181-198))
Baxevanakis, K. P.; Giannakopoulos, A. E. (2014) -
Evaluation of material properties of incompressible hyperelastic materials based on instrumented indentation of an equal-biaxial prestretched substrate
Zisis, T.; Zafiropoulou, V. I.; Giannakopoulos, A. E. (2015)It is well known that instrumented indentation tests are useful tools in probing mechanical properties of materials such as metals and ceramics. Instrumented indentation of hyperelastic materials such as rubbers, bio-materials, ... -
An example of double forces taken from structural analysis
Vardoulakis, I.; Giannakopoulos, A. E. (2006)The classic Bernoulli-Euler beam is revisited in relation to the Timoshenko beam, using a T-type cross-section. A practical example of double forces is worked out, where the double forces appear due to the shearing of the ... -
Finite Element Analysis of Discrete Circular Dislocations
Baxevanakis, K. P.; Giannakopoulos, A. E. (2010)The present work gives a systematic and rigorous implementation of (edge type) circular Volterra dislocation loops in ordinary axisymmetric finite elements using the thermal analogue and the integral representation of ... -
Finite Element Analysis of Discrete Circular Dislocations (vol 60, pg 181, 2010)
Baxevanakis, K. P.; Giannakopoulos, A. E. (2014) -
Finite element analysis of discrete edge dislocations: Configurational forces and conserved integrals
Baxevanakis, K. P.; Giannakopoulos, A. E. (2015)We present a finite element description of Volterra dislocations using a thermal analogue and the integral representation of dislocations through stresses in the context of linear elasticity. Several analytical results are ... -
Finite element analysis of Volterra dislocations in anisotropic crystals: A thermal analogue
Giannakopoulos, A. E.; Baxevanakis, K. P.; Gouldstone, A. (2007)The present work gives a systematic and rigorous implementation of Volterra dislocations in ordinary two-dimensional finite elements using the thermal analogue and the integral representation of dislocations through the ... -
Gradient Elastodamage Model for Quasi-Brittle Materials with an Evolving Internal Length
Triantafyllou, A.; Perdikaris, P. C.; Giannakopoulos, A. E. (2015)The article presents a new approach based on a strain gradient damage constitutive law for modeling quasi-brittle materials such as concrete. The authors use a weak type nonlocal formulation of the problem, relying on ...