Patent ID: 9297730
Filing Date: 2016-03-29
CPC Classification: G01N

Claim Text:
1. A method of calculating a Young's modulus of a material specimen that is a biological soft tissue, the method comprising: indenting the material specimen with an indenter attached to a load axis actuated by an actuator; obtaining an indentation force of the indenter using a load cell attached to the load axis; obtaining, using a potentiometer, an indentation depth of the indenter into the material specimen based on a travel of the indenter; obtaining, as a strain induced by compression deformation, a rate at which a compressed region in the material specimen changes, the compressed region being a region in the material specimen that is compressed and deformed by a load from the indenter; obtaining, as a strain induced by contact deformation, a strain induced when the indenter comes into contact with the material specimen; summing the strain induced by compression deformation and the strain induced by contact deformation to determine an equivalent indentation strain of the material specimen; and calculating, using a Young's modulus calculator, the Young's modulus of the material specimen using the equivalent indentation strain of the material specimen, wherein the strain induced by compression deformation is defined by the strain induced by contact deformation is defined by where ν is the Poisson ratio, and the Young's modulus is calculated by where ε