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Related Concept Videos

Wedges01:24

Wedges

A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...
Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Design Example: Forces in Sluice Gate01:11

Design Example: Forces in Sluice Gate

In hydraulic engineering, sluice gates are essential for managing water flow through channels, reservoirs, and irrigation systems. Sluice gates, acting as vertical barriers, regulate water by adjusting the gate's opening height, which changes the velocity and pressure of water flowing beneath the gate. Understanding the forces involved is crucial to designing sluice gates that can withstand dynamic pressure differences, especially when the gate is closed or partially open.
Key variables in...
Machines: Problem Solving I01:22

Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...

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Related Experiment Video

Updated: May 26, 2026

Insect-machine Hybrid System: Remote Radio Control of a Freely Flying Beetle (Mercynorrhina torquata)
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Insect-machine Hybrid System: Remote Radio Control of a Freely Flying Beetle (Mercynorrhina torquata)

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Analysis of preload-dependent reversible mechanical interlocking using beetle-inspired wing locking device.

Changhyun Pang1, Daeshik Kang, Tae-il Kim

  • 1Division of WCU Multiscale Mechanical Design, Seoul National University, Seoul 151-742, Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Researchers analyzed how polymer micro/nanofibers interlock under pressure, inspired by beetle wings. This study reveals how preload affects adhesion forces for advanced materials.

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Last Updated: May 26, 2026

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Area of Science:

  • Materials Science
  • Biomimetics
  • Surface Science

Background:

  • Nature-inspired designs offer unique mechanical properties.
  • Beetle wing microtrichia demonstrate effective adhesion through interlocking.
  • High aspect ratio structures are key to maximizing surface interactions.

Purpose of the Study:

  • To investigate preload-dependent reversible interlocking in polymer micro- and nanofibers.
  • To mimic the adhesive mechanisms found in beetle wings.
  • To develop a theoretical model explaining adhesion forces.

Main Methods:

  • Fabrication of high aspect ratio (AR) polymer micro- and nanopillars on flexible substrates.
  • Experimental analysis of shear locking force under varying preloads (0.1-10 N/cm²).
  • Development of a theoretical model considering van der Waals forces and pillar deflection.

Main Results:

  • Demonstrated preload-dependent reversible interlocking behavior.
  • Quantified shear adhesion forces based on pillar geometry and preload.
  • The theoretical model accurately predicts pillar deflection, tilting angle, and adhesion force.

Conclusions:

  • High AR polymer micro/nanofibers exhibit reversible interlocking inspired by natural structures.
  • Adhesion is governed by a balance between van der Waals attraction and mechanical deflection.
  • This research provides insights for designing advanced adhesive materials.