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Volume calculation often begins with simple geometric solids. For example, the volume of a rectangular box is obtained by multiplying the area of its base by its height. This straightforward approach relies on the fact that the cross-sectional area of the box remains constant throughout its length. Many real-world objects, however, do not have uniform cross-sections, and their volumes cannot be determined using elementary geometric formulas.To address this limitation, the Slicing Method...

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Thin Sectioning of Slice Preparations for Immunohistochemistry

Thin Sectioning of Slice Preparations for Immunohistochemistry

Published on: April 28, 2007

Slicing of a soft solid.

Meng Li¹, Preetika Karnal¹, Yinan Lu¹

¹Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

The Journal of Chemical Physics

|September 19, 2023

Summary

Researchers studied the cutting of polydimethylsiloxane (PDMS) elastomers, revealing distinct stages from initial indentation to stick-slip cutting. This provides a fundamental understanding of soft material slicing dynamics.

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Area of Science:

Materials Science
Mechanical Engineering
Soft Matter Physics

Background:

Cutting soft materials like elastomers presents fundamental challenges due to complex deformation behaviors.
Understanding the mechanics of slicing is crucial for applications involving soft materials.

Purpose of the Study:

To investigate and quantitatively interpret the distinct stages involved in the slicing of polydimethylsiloxane (PDMS) elastomers.
To characterize the force response and surface deformation during the cutting process.

Main Methods:

Experimental analysis of the cutting process using PDMS elastomers with varying elastic moduli.
Observation and measurement of blade indentation, slip initiation, and steady-state sliding forces.

Main Results:

Identified distinct cutting stages: elastic deformation, sudden slip initiation, smooth cutting, and stick-slip motion with fold formation.
Observed that steady-state cutting in soft PDMS exhibits oscillatory forces due to stick-slip behavior.
Determined that average shear force plateaus during steady sliding, independent of displacement.

Conclusions:

The study provides a quantitative interpretation of the fundamental stages in elastomer slicing.
Characterization of cutting mechanics aids in predicting and controlling material failure in soft materials.