Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Oscillating adhesive contacts between micron-scale tips and compliant polymers.

K J Wahl1, S A S Asif, J A Greenwood

  • 1Tribology Section, Code 6176, Naval Research Laboratory, Washington, DC 20375, USA. kathryn.wahl@nrl.navy.mil

Journal of Colloid and Interface Science
|September 20, 2005
PubMed
Summary

This study reveals that the viscoelasticity of poly(dimethylsiloxane) (PDMS) elastomers causes measured stiffness to deviate from theoretical models under oscillatory loading. The findings reconcile apparent paradoxes in nanoindentation measurements of PDMS adhesion.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Perceptual exposure influences body size perceptions and anti-fat attitudes.

Communications psychology·2026
Same author

The Graded Incomplete Letters Test (GILT): a rapid test to detect cortical visual loss, with UK Biobank implementation.

Behavior research methods·2024
Same author

Waste to resource: use of water treatment residual for increased maize productivity and micronutrient content.

Environmental geochemistry and health·2021
Same author

Surgical repair of a meningoencephalocoele in a kākāpō (<i>Strigops habroptilus</i>).

New Zealand veterinary journal·2021
Same author

Finite element analysis of a ram brain during impact under wet and dry horn conditions.

Journal of the mechanical behavior of biomedical materials·2021
Same author

A mesoscale finite element modeling approach for understanding brain morphology and material heterogeneity effects in chronic traumatic encephalopathy.

Computer methods in biomechanics and biomedical engineering·2021

Area of Science:

  • Materials Science
  • Polymer Physics
  • Surface Science

Background:

  • Adhesion studies of elastomers like poly(dimethylsiloxane) (PDMS) are crucial for understanding material behavior.
  • The Johnson-Kendall-Roberts (JKR) model describes adhesive contact but may not fully capture viscoelastic effects.

Purpose of the Study:

  • To investigate the adhesion of PDMS elastomers using a depth-sensing nanoindenter under oscillatory loading.
  • To reconcile discrepancies between experimental stiffness measurements and theoretical JKR predictions.

Main Methods:

  • Utilized a depth-sensing nanoindenter with diamond probes (R = 5 or 10 microm) on PDMS samples.
  • Applied oscillatory loading to study force-displacement curves and tip-sample interaction stiffness.
  • Analyzed data considering viscoelasticity, oscillation frequency, and the Tabor parameter.

Related Experiment Videos

Main Results:

  • Experimental stiffness measurements consistently exceeded theoretical JKR stiffness, even in the negative stiffness region.
  • Viscoelasticity of PDMS under oscillatory loading leads to an oscillating crack tip that can maintain a fixed contact size.
  • Transitions between JKR and punch stiffness behavior were observed by altering probe radius, PDMS modulus, or oscillation frequency.

Conclusions:

  • The viscoelastic nature of PDMS under oscillatory loading explains the observed deviations from JKR theory.
  • A fixed contact size, akin to a flat punch, occurs under specific conditions, leading to measured stiffness matching punch stiffness.
  • The study provides a framework for understanding and predicting the mechanical response of viscoelastic materials in adhesive contact scenarios.