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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Creases on the interface between two soft materials.

Lihua Jin1, Dayong Chen, Ryan C Hayward

  • 1School of Engineering and Applied Sciences, Kavli Institute for Nanobio Science and Technology, Harvard University, Cambridge, Massachusetts 02138, USA. suo@seas.harvard.edu.

Soft Matter
|March 22, 2014
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Summary
This summary is machine-generated.

Soft material interfaces under compression can form distinct creases, unlike wrinkles. These interfacial creases appear at a specific compression threshold, offering new insights into material deformation and stability.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Soft Matter Physics

Background:

  • Interfaces between soft materials are susceptible to deformation under applied stress.
  • Understanding buckling and pattern formation in soft materials is crucial for designing advanced materials and devices.
  • Distinguishing between different types of pattern formation, such as creases and wrinkles, is essential for accurate modeling.

Purpose of the Study:

  • To theoretically and experimentally investigate the formation of creases at the interface between two compressed soft materials.
  • To differentiate interfacial creases from interfacial and surface wrinkles based on their bifurcation mechanisms.
  • To determine the critical conditions for the onset of interfacial creases and their dependence on material properties.

Main Methods:

  • Development of a theoretical framework based on continuum mechanics to model interfacial deformation.
  • Conducting compression experiments on bilayer soft material systems to observe and measure pattern formation.
  • Analyzing the spatial localization and amplitude of deformations to classify bifurcation types.

Main Results:

  • Identified interfacial creases as a distinct type of bifurcation, characterized by localized, large-amplitude deformations.
  • Demonstrated that interfacial creases form at a lower critical compression than interfacial wrinkles but higher than surface creases.
  • Established a scale-free condition for the onset of interfacial creases, dependent on elastic moduli, pre-strains, and applied strains.

Conclusions:

  • Interfacial creases represent a unique deformation mode in soft materials under compression.
  • The onset of interfacial creases is predictable and controllable through material properties and applied strains.
  • This research provides fundamental insights into the mechanics of soft interfaces, with implications for material design and failure analysis.