• Degradation in Cone-Plate Rheometry 

      Giacomin, A. Jeffrey; Gilbert, Peter H. (2018-07)
      We analyze quantitatively the oxidative degradation of a sample in a cone-plate rheometer, as oxygen diffuses inward, radially, from the free boundary. We examine rheometer error mitigation by means of nitrogen blanketing, ...
    • Degradation in Parallel-Disk Rheometry 

      Giacomin, A. Jeffrey; Pasquino, R.; Saengow, Chaimongkol; Gilbert, Peter H. (2018-08)
      We analyze quantitatively the oxidative degradation of a sample in a parallel-disk rheometer, as oxygen diffuses inward, radially, from the free boundary. We examine rheometer error mitigation by means of nitrogen blanketing, ...
    • Exact Analytical Interconversion between Durometer Hardness Scales 

      Gilbert, Peter H.; Giacomin, A. Jeffrey (2017-02)
      Previous work has related Young’s modulus to durometer hardness for any standardized scale. In this paper, we build on this work to solve explicitly and exactly for the hardness in any one standardized durometer hardness ...
    • Exact-solution for Cone-plate Viscometry 

      Giacomin, A. Jeffrey; Gilbert, Peter H. (2017-08)
      The viscosity of a Newtonian fluid is often measured by confining the fluid to the gap between a rotating cone that is perpendicular to a fixed disk. We call this experiment cone-plate viscometry. When the cone angle ...
    • Order in Oscillatory Shear Flow  

      Kanso, Mona A.; Giacomin, A. Jeffrey; Saengow, Chaimongkol; Gilbert, Peter H. (2018-12)
      We examine the second order orientation tensor for the simplest molecular model relevant to a polymeric liquid in large-amplitude oscillatory shear flow (LAOS), the rigid dumbbell suspension. For this we use an approximate ...
    • Polymer Orientation Contributions in Large-Amplitude Oscillatory Shear Flow 

      Gilbert, Peter H.; Giacomin, A. Jeffrey (2017-01)
      Previously, we used a dilute suspension of rigid dumbbells as a model for the dynamics for polymeric liquids in large-amplitude oscillatory shear (LAOS) flow. We then use dumbbell orientation to explain fluid elasticity. ...