Browsing by Subject "Viscoplasticity"

Now showing items 1-9 of 9

    • Article  

      On the early breakdown of semisolid suspensions 

      Alexandrou, Andreas N.; Georgiou, Georgios C. (2007)
      Semisolid materials are suspensions of metal alloys which are processed while in a mushy state. In this state, the suspensions behave as viscoplastic materials with time-dependent material properties. During processing, ...
    • Article  

      On the early breakdown of semisolid suspensions 

      Alexandrou, Andreas N.; Georgiou, G. (2007)
      Semisolid materials are suspensions of metal alloys which are processed while in a mushy state. In this state, the suspensions behave as viscoplastic materials with time-dependent material properties. During processing, ...
    • Article  

      On the transition to turbulence of a viscoplastic fluid past a confined cylinder: A numerical study 

      Kanaris, N.; Kassinos, Stavros C.; Alexandrou, Andreas N. (2015)
      Three-dimensional direct numerical simulations of a Bingham fluid flowing past a confined circular cylinder have been used in order to investigate viscoplastic effects in the wake-transition regime. The case of a cylinder ...
    • Article  

      Thixotropic flow past a cylinder 

      Syrakos, A.; Georgiou, Georgios C.; Alexandrou, Andreas N. (2014)
      We study the flow of a thixotropic fluid around a cylinder. The rheology of the fluid is described by means of a structural viscoplastic model based on the Bingham constitutive equation, regularised using the Papanastasiou ...
    • Article  

      Thixotropic flow past a cylinder 

      Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2014)
      We study the flow of a thixotropic fluid around a cylinder. The rheology of the fluid is described by means of a structural viscoplastic model based on the Bingham constitutive equation, regularised using the Papanastasiou ...
    • Conference Object  

      Uniaxial and biaxial mechanical behavior of human amnion 

      Barocas, V. Η; Oyen, M. L.; Stylianopoulos, T.; Calvin, S. E.; Cook, R. F. (Affiliation: Department of Biophysical Sciences and Medical Physics, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Department of Obstetrics, Gynecology and Women's Health, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Minnesota Perinatal Physicians/Allina Health System, Minneapolis, MN 55407, United StatesCorrespondence Address: Oyen, M.L.Department of Biophysical Sciences and Medical Physics, University of Minnesota, Minneapolis, MN 55455, United States, 2005)
      Chorioamnion, the membrane surrounding a fetus during gestation (the "amniotic sac"), is a structural soft tissue for which the mechanical behavior is poorly understood-despite its critical role in maintaining a successful ...
    • Article  

      Unsteady circular Couette flow of a Bingham plastic with the Augmented Lagrangian Method 

      Muravleva, L.; Muravleva, E.; Georgiou, Georgios C.; Mitsoulis, Evan C. (2010)
      Numerical simulations are undertaken for unsteady flows of an ideal Bingham fluid in a circular Couette viscometer. The main difficulties in such simulations are caused by the non-differentiability of the constitutive ...
    • Article  

      Viscoplastic flow in an extrusion damper 

      Syrakos, A.; Dimakopoulos, Yannis; Georgiou, Georgios C.; Tsamopoulos, J. (2016)
      Numerical simulations of the flow in an extrusion damper are performed using a finite volume method. The damper is assumed to consist of a shaft, with or without a spherical bulge, oscillating axially in a containing ...
    • Doctoral Thesis  Open Access

      Viscoplastic flows with wall slip and pressure-dependent rheological parameters 

      Panaseti, Pandelitsa E. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2019-01)
      Τα ιξωδοπλαστικά υλικά συμπεριφέρονται ως ρευστά ή ως στερεά αν η τάση είναι μικρότερη ή μεγαλύτερη από την τάση διαρροής (yield-stress), αντίστοιχα. Αυτή η διττή συμπεριφορά έχει ως αποτέλεσμα το ότι το πεδίο ροής χωρίζεται ...