Browsing by Author "Aravas, N."
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3D catalytic regeneration and stress modeling of diesel particulate filters by ABAQUS FEM software
Pontikakis, G.; Stamatelos, A.; Bakasis, K.; Aravas, N. (2002)The design of reliable DPF systems has proved a complex and demanding task that is increasingly being assisted by modeling. 1D but also 2D (axisymmetric) modeling has already been applied in design optimization case ... 
A Bayesian methodology for crack identification in structures using strain measurements
Gaitanaros, S.; Karaiskos, G.; Papadimitriou, C.; Aravas, N. (2010)A Bayesian system identification methodology is presented for estimating the crack location, size and orientation in a structure using strain measurements. The Bayesian statistical approach combines information from measured ... 
Constitutive modeling and finite element methods for TRIP steels
Papatriantafillou, I.; Agoras, M.; Aravas, N.; Haidemenopoulos, G. (2006)A constitutive model that describes the mechanical behavior of steels exhibiting "TRansformation Induced Plasticity" (TRIP) during martensitic transformation is presented. Multiphase TRIP steels are considered as composite ... 
Constitutive modeling of porous viscoelastic materials
Xu, F.; Sofronis, P.; Aravas, N.; Meyer, S. (2007)The effect of porosity on the constitutive response of an isotropic linearly viscoelastic solid that obeys a constitutive law of the standard differential form is investigated under small strain deformation conditions. The ... 
Constitutive modeling of solid propellant materials with evolving microstructural damage
Xu, F.; Aravas, N.; Sofronis, P. (2008)Solid propellants are composite materials with complex microstructure. In a generic form, the material consists of polymeric binder, crystal oxidizer (e.g., ammonium perchlorate), and fuel particles (e.g., aluminum). Severe ... 
Constitutive response and damage in solid propellants
Aravas, N.; Xu, F.; Sofronis, P.; Namazifard, A.; Fiedler, R. (2005)Solid propellants are composite materials with complex microstructure. In a generic form, the material consists of polymeric binder, ceramic oxidizer, and fuel particles (e.g. aluminum). Damage induced by severe stress and ... 
Detailed simulations of propellant slumping in the titanIV SRMU PQM1
Fiedler, R.; Namazifard, A.; Campbell, M.; Xu, F.; Aravas, N.; Sofronis, P. (2006)We utilize our tightlycoupled fluid/structure/combustion solid propellent rocket simulation package ("Rocstar") to study the unexpectedly large deformation of propellant at the center joint slot in a prequalification ... 
Evaluation of creep damage of INCOLOY 800HT pigtails in a refinery steam reformer unit
Spyrou, L. A.; Sarafoglou, P. I.; Aravas, N.; Haidemenopoulos, G. N. (2014)Pigtail tubes constitute a critical component of the outlet system of steam reformer units for hydrogen production in refineries. Creep failure of pigtails is a common cause of downtime and potential risk to plant personnel. ... 
Finite element implementation of gradient plasticity models  Part I: Gradientdependent yield functions
Ramaswamy, S.; Aravas, N. (1998)Theories with intrinsic or material length scales find applications in the modeling of sizedependent phenomena such as, for example, the localization of plastic flow into shear bands. In gradienttype plasticity theories, ... 
Finite element implementation of gradient plasticity models  Part II: Gradientdependent evolution equations
Ramaswamy, S.; Aravas, N. (1998)The variational formulation and finite element implementation of a class of plasticity models with gradientdependent yield functions is covered in detail in Part I. In this sequel, attention is focussed upon the finite ... 
Finite element implementation of gradient plasticity models part I: Gradientdependent yield functions
Ramaswamy, S.; Aravas, N. (1998)Theories with intrinsic or material length scales find applications in the modeling of sizedependent phenomena such as, for example, the localization of plastic flow into shear bands. In gradienttype plasticity theories, ... 
Finite element implementation of gradient plasticity models Part II: Gradientdependent evolution equations
Ramaswamy, S.; Aravas, N. (1998)The variational formulation and finite element implementation of a class of plasticity models with gradientdependent yield functions is covered in detail in Part I. In this sequel, attention is focussed upon the finite ... 
A finite element model of the Ilizarov fixator system
Toumanidou, Th; Spyrou, L. A.; Aravas, N. (2011)Mechanical characteristics of orthopaedic fixators, such as stiffness and stability, directly influence the mechanobiological environment in which the bone is healed. A comprehensive understanding of the sensitivity of the ... 
Finite element modeling of porous solid propellants
Xu, F.; Sofronis, P.; Aravas, N.; Namazifard, A.; Fiedler, R. (2005)The effect of porosity on the constitutive response of a linearly viscoelastic solid that obeys a constitutive law of the standard differential form is investigated under small strain deformation conditions. It is demonstrated ... 
Finite element modeling of trip steels
Papatriantafillou, I.; Aravas, N. (2004)In this paper, a constitutive model that describes the mechanical behavior of steels exhibiting the "Transformation Induced Plasticity" (TRIP) phenomenon during martensitic transformation is presented. Multiphase TRIP ... 
Finite element modelling of TRIP steels
Papatriantafillou, I.; Aravas, N.; Haidemenopoulos, G. N. (2004)A constitutive model that describes the mechanical behaviour of steels exhibiting "Transformation Induced Plasticity" (TRIP) during martensitic transformation is presented. Multiphase TRIP steels are considered as composite ... 
Hydrogen induced shear localization of the plastic flow in metals and alloys
Sofronis, P.; Liang, Y.; Aravas, N. (2001)Hydrogen enhanced localized plasticity (HELP) is a viable mechanism for hydrogen embrittlement supported by experimental observations. According to the HELP mechanism, hydrogen induced premature failures result from hydrogen ... 
Kinetics of straininduced transformation of dispersed austenite in lowalloy TRIP steels
Haidemenopoulos, G. N.; Aravas, N.; Bellas, I. (2014)A model describing the kinetics of the evolution of martensite volume fraction during the straininduced transformation of dispersed austenite in lowalloy TRIP steels has been developed. The model is based on the modification ... 
A Linear Complementarity formulation of rateindependent finitestrain elastoplasticity. Part I: Algorithm for numerical integration
Bassi, A.; Aravas, N.; Genna, F. (2012)A methodology for the numerical integration of rateindependent, elasticplastic finitestrain models is developed. The methodology is based on the idea of local linearization of the yield surface that was proposed in Maier ... 
A Linear Complementarity formulation of rateindependent finitestrain elastoplasticity. Part II: Calculation of bifurcation and limit points
Bassi, A.; Aravas, N.; Genna, F. (2012)A methodology for the numerical solution of discretized boundary value problems that involve rateindependent, elasticplastic finitestrain models is developed. The formulation is given in terms of a structural Linear ...