Nanoindentation measurements frequently involve a hold period at the peak load to allow material reach stabilized state. A dwell time is also commonly employed sufficiently low after unloading, quantify thermal drift for correction of raw load-displacement data. This communication presents numerical case studies indentation loading on viscoelastic thin film using finite element method. We illus...

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...

Elasticity imaging is emerging as an important tool for breast cancer detection and monitoring of treatment. Viscoelastic contrast in lesions is generated by disease specific processes that modify the molecular structure of connective tissues. We showed previously that gelatin hydrogels exhibit mechanical behavior similar to native collagen found in breast tissue and therefore are suitable as p...

The effective design of body armor requires the use of biomimicking materials that accurately and robustly reproduce the characteristic mechanical behavior of human tissues. The mechanical performance of the soft tissues is determined by their viscoelastic properties and for this reason the optimal soft tissue surrogate must viscoelastically mimic the original tissue. One traditional tissue sur...

INTRODUCTION Articular cartilage is known to exhibit strong transient mechanical behavior. When subjected to high strainrate loading, its apparent stiffness can be 10 times greater than its stiffness at equilibrium. However, the mechanism of this strain-rate dependent response is not completely understood. While some studies have shown evidence of a fluid-flow dominant mechanism of the strain-r...

Because of their outstanding physical properties, the use of carbon nanotubes within a polymer matrix has been proposed as a means to fabricate multifunctional composite materials with outstanding mechanical, electrical, and thermal properties. To date, experimental work studying the mechanical response of a nanotube reinforced polymer (NRP) has typically focused on the effective elastic modulu...

Rock-like materials are composites that can be regarded as a mixture composed of elastic, plastic, and viscous components. They exhibit viscoelastic-plastic behavior under a high-strain-rate loading according to element model theory. This paper presents an analytical solution for stress wave propagation in viscoelastic-plastic rock-like materials under a high-strain-rate loading and verifies th...