☆ 4.5 Article

A Preliminary Two-Dimensional Palpation Mechanics for Detecting a Hard Inclusion by Indentation of a Soft Matrix Under Large Strain

JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME (2019)

期刊

JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME

卷 86, 期 5, 页码 -

出版社

ASME

DOI: 10.1115/1.4042919

关键词

palpation; large deformation; solid inclusion; hyperelastic matrix; indentation; soft tissue; elastic instability

类别

Mechanics

资金

Aerospace, Mechanical, and Mechatronic Engineering (AMME) at the University of Sydney, Australia

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Reagent

摘要

A rigid inclusion is embedded at a finite depth in a soft layer resting on a rigid substrate. A spherical indenter presses vertically onto the surface, deforming the matrix and displacing the inclusion. A subsurface inclusion initially near the indentation axis moves primarily downward, until an unstable lateral jump occurs to minimize the energy stored in the elastic medium. Such an instability is unique to soft materials undergoing large deformation. A two-dimensional plane-strain finite element analysis is used to simulate the 3D phenomenon.

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