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Related Concept Videos

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.
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Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
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Support Reactions

A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
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Force-Clamp Rheometry for Characterizing Protein-based Hydrogels
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Published on: August 21, 2018

Piezoresistive cantilever force-clamp system.

Sung-Jin Park1, Bryan C Petzold, Miriam B Goodman

  • 1Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.

The Review of Scientific Instruments
|May 3, 2011
PubMed
Summary

A new force-clamp system precisely controls forces and displacements for materials science. This microelectromechanical device offers a large dynamic range and fast response for various applications.

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Area of Science:

  • Microelectromechanical Systems (MEMS)
  • Biophysics
  • Materials Science

Background:

  • Precise force and displacement control are crucial for mechanical characterization.
  • Existing systems often lack the dynamic range or responsiveness needed for complex measurements.
  • Integration with other experimental setups can be challenging.

Purpose of the Study:

  • To develop a versatile microelectromechanical device for controlled force application and displacement.
  • To enable precise measurement of mechanical properties across a wide range of scales.
  • To demonstrate the system's utility in calibrating other instruments and studying biological mechanics.

Main Methods:

  • Utilized a piezoresistive cantilever as a force sensor and a piezoelectric actuator's capacitive sensor for displacement.
  • Implemented a programmable real-time controller with 100 kHz feedback for actuator control.
  • Designed two operational modes: force-clamp and displacement-clamp.

Main Results:

  • Achieved a large dynamic range (sub-nN to tens of μN force, nm to tens of μm displacement) in air and water.
  • Demonstrated excellent dynamic response with a fast response time (<2 ms) and broad bandwidth (1 Hz to 1 kHz).
  • Successfully calibrated an electrostatic actuator and measured the mechanics of *Caenorhabditis elegans*.

Conclusions:

  • The force-clamp system provides a robust platform for precise mechanical testing.
  • Its versatility and performance characteristics make it suitable for diverse scientific investigations.
  • The system's design facilitates integration with microscopy and other advanced experimental tools.