Viscoelasticity is an essential property of bone related to fragility, which altered in aging and disease. Bone viscoelastic behavior attributed several mechanisms involving collagen mineral properties, porosities, hierarchical tissue organization. We aimed assess the relationships between cortical damping measured with Resonant Ultrasound Spectroscopy (RUS), microstructural compositional chara...

The application of surface-active biopolymers supports opportunities and novel prospects to generate a well-defined printable ink for 3D printing. In this regard, an ideal must show pseudoplastic, viscoelastic, thixotropic characters with recoverable structure so as be effectively printed desired printability. Here, microcrystalline cellulose was hydrophobically modified through facile sustaina...

AIMS AND OBJECTIVES The aim of this study is to compare whether differences exist between 2 viscoelastic foam support surfaces in the development of new pressure ulcers. BACKGROUND There is evidence to support the use of viscoelastic foam over standard hospital foam to reduce pressure. A comparative effectiveness study was done to compare 2 viscoelastic foam support surfaces. DESIGN A rando...

We solve the free boundary problem for the dynamics of a cylindrical, axisymmetric viscoelastic filament stretching in a gravity-driven extensional flow for the Upper Convected Maxwell and Oldroyd-B constitutive models. Assuming the axial stress in the filament has a spatial dependence provides the simplest coupling of viscoelastic effects to the motion of the filament, and yields a closed syst...

The problem of transient propagation in a homogeneous linear viscoelastic solid is investigated by means of the wave splitting technique. Two mechanical viscoelastic models are considered in particular, corresponding respectively to a single Maxwell element and to the series of a Maxwell element plus a Kelvin element. Analytical solutions for the split field are evaluated in terms of the wave p...

An instrumented indentation method is developed for generating maps of time-dependent viscoelastic and time-independent plastic properties of polymeric materials. The method is based on a pyramidal indentation model consisting of two quadratic viscoelastic Kelvin-like elements and a quadratic plastic element in series. Closed-form solutions for indentation displacement under constant load and c...

For objective 1: Complete the viscoelastic theory. Key individuals are the PI and a PhD student. Task 1: Use an analytical method to determine the propagation of waves through a floating viscoelastic mat for a wide range of effective viscosity and elasticity parameters. This range should include all possible ice cover types in the MIZ. The outcome of this task is a direct relation between visco...

In this paper, a thermomechanical problem involving viscoelastic Timoshenko beam is analyzed from numerical point of view. The so-called thermodiffusion effects are also included in the model. written as linear system composed two second-order-in-time partial differential equations for transverse displacement and rotational movement, first-order-in-time temperature chemical potential. correspon...

Proton exchange membrane fuel cells typically consist of stacks of membrane electrode assemblies sandwiched between bipolar plates, effectively combining the individual cells in series to achieve the desired voltage levels. Elastomeric gaskets are commonly used between each cell to insure that the reactant gases are isolated; any failure of a fuel cell gasket can cause the reactants to mix, whi...

The objective of this research is to establish structure-property relationships for macromolecules bearing reversibly associating side-groups. In previous studies we demonstrated shape-memory behavior for elastomer networks bearing strong ureidopyrimidinone (UPy) hydrogen-bonding side-groups. However, relationships between the underlying viscoelastic behavior and side-group features such as hyd...