An empirical measure of nonlinear strain for soft tissue indentation.

ABSTRACT: Indentation is a primary tool in the investigation of the mechanical properties of very soft tissue such as the brain. However, the usual material characterization protocols are not applicable because the resulting deformation is inhomogeneous, with even the identification of the amount of strain ambiguous and uncertain. Focusing on spherical indentation only, a standard is needed to quantify the amount of strain in terms of the probe radius and displacement so that different indentation experiments can be compared and contrasted. It is shown here that the minimum axial value of the Eulerian logarithmic strain tensor has many desirable properties of such a standard, such as invariance under the choice of material model, and experimental conditions for a given probe displacement. The disadv

SUBMITTER: MacManus DB 

PROVIDER: S-EPMC5717656 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature