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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Transient adhesion in a non-fully detached contact.

Zheyu Liu1, Hongyu Lu1, Yelong Zheng1

  • 1The State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, 100084, Beijing, China.

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Summary

Transient adhesion forces occur in non-fully detached contacts, challenging traditional adhesion testing. Understanding interfacial adhesion hysteresis and stiffness combinations is crucial for designing better adhesive actuators.

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Area of Science:

  • Materials Science
  • Surface Science
  • Mechanical Engineering

Background:

  • Adhesion tests typically involve continuous approaching and detaching displacements.
  • Traditional quasi-static theory predicts no adhesion force at a specific detaching displacement.

Purpose of the Study:

  • To investigate transient adhesion forces at the end of non-fully detached contacts.
  • To understand the underlying mechanisms of this transient adhesion.
  • To analyze the influence of stiffness on adhesion testing and actuator design.

Main Methods:

  • Experimental adhesion testing with varying displacement parameters.
  • Analysis of interfacial adhesion hysteresis.
  • Investigation of contact cracking and deformation dynamics.
  • Examination of the interplay between object stiffness and supporting spring cantilever stiffness.

Main Results:

  • A transient adhesion force was observed when detaching displacement was less than the predicted zero-force point.
  • This force is attributed to interfacial adhesion hysteresis, driven by contact cracking and deformation competition.
  • Adhesion test outcomes are significantly influenced by the stiffness combinations of the contact and supporting spring.

Conclusions:

  • Transient adhesion forces represent a critical phenomenon in adhesion testing.
  • Interfacial adhesion hysteresis plays a key role in the observed transient forces.
  • Careful design and consideration of stiffness combinations are essential for accurate adhesion testing and effective adhesive actuator development.