Quasi-static and Oscillatory Indentation in Linear Viscoelastic Solids

Nonlinear analysis of oscillatory indentation in elastic and viscoelastic solids.

Determining the mechanical properties at micro- and nanometer length scales using nanoindentation or atomic force microscopy is important to many areas of science and engineering. Here we establish equations for obtaining storage and loss modulus from oscillatory indentations by performing a nonlinear analysis of conical and spherical indentation in elastic and viscoelastic solids. We show that...

Indentation Analysis of Fractional Viscoelastic Solids

Quasi-linear viscoelastic properties of fibrotic neck tissues obtained from ultrasound indentation tests in vivo.

BACKGROUND Hand palpation is a conventional way to assess and document soft tissue fibrosis. But it is semi-quantitative and subjective, so there is a need to develop quantitative and objective methods for this purpose. METHODS 105 patients with different degrees of radiation-induced fibrosis of soft tissue of the neck were assessed using an ultrasound indentation method. The force response w...

A Comparison of Low-Velocity Impact and Quasi-Static Indentation

Quasi-Static and Harmonic Indentation of Osteonal Bone

UNLABELLED The purpose of the study was to compare Quasi-Static (QS) and harmonic (CSM) methods of indentation testing. Bone sections were obtained from mid-femoral diaphyses of dogs which received a pair of calcein labels. Labeled (n = 35) and unlabeled (n = 112) osteons were identified. Indentation modulus (IM) and hardness (H) for the CSM method were collected during the entire loading cycle...