Force-ramp Protocol
Force-ramp Protocol - Related Videos
10:35
Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy
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Cited by 26 •
2016
We present detailed protocols for isolation of aortas from mouse and measurement of their elastic modulus using atomic force microscopy.
08:00
Force and Acceleration
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2023
Source: Nicholas Timmons, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA The goal of this experiment is to understand the components of force and their relation to motion through the use of Newton's second law by measuring the acceleration of a glider being acted upon by a force. Nearly every aspect of motion in everyday life can be described using Isaac Newton's three laws of motion. They describe how objects in...
03:13
Intermolecular Forces
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2020
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
02:36
Electromotive Force
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2020
Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
03:08
Characterization of the Mechanical Properties of Mouse Brain Tissue Using Atomic Force Microscopy
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2025
Source: Canovic, E. P., et al. Characterizing Multiscale Mechanical Properties of Brain Tissue Using Atomic Force Microscopy, Impact Indentation, and Rheometry. J. Vis. Exp. (2016)This video demonstrates the use of atomic force microscopy (AFM) to measure the viscoelastic properties of brain tissue, where a cantilever with a spherical probe interacts with the tissue and bends under applied forces. A laser beam deflected onto a detector tracks the cantilever to measure indentation depth and...
FAQs
Controlling the loading rate makes responses comparable across tests because the system experiences force changes according to a defined time or displacement schedule. If the rate varies between experiments, differences in measured deformation, detachment, or failure thresholds may reflect the loading history rather than the property being studied. Consistent loading therefore supports quantitative comparison and model validation.
A force-response curve links the applied load to measured behavior such as displacement, deformation, detachment, or failure. Its features can support estimates of stiffness and strength, while abrupt changes or limiting points may indicate adhesion, friction, or a failure threshold. Engineers use these responses to compare materials, components, or interfaces under controlled mechanical conditions.
The selected ramp range establishes how the force changes during the experiment. A time-defined range controls the progression according to elapsed time, whereas a displacement-defined range relates loading to a specified movement. Recording the chosen basis is important because force-response results must be interpreted in relation to the schedule used to produce them.
Force alone may not describe the mechanical response sufficiently, so instrumentation can also record displacement, deformation, detachment, or other relevant changes. The loading rate and experimental conditions should remain controlled throughout the test. Coordinating these measurements allows the resulting curve to connect the applied load with a specific mechanical response and outcome.
A basic workflow defines the force increase and its time or displacement range, establishes the experimental conditions, and applies the load progressively. Instrumentation then records force together with relevant responses such as displacement, deformation, or detachment. After testing, engineers examine the force-response curve to quantify behavior and compare the system with other samples or designs.
Engineers choose this approach when they need to observe how a system responds across changing load rather than at only one force value. The progressive measurement can characterize stiffness, strength, adhesion, friction, or failure thresholds. This makes the method useful for comparing materials and interfaces, evaluating components, and examining how mechanical performance changes as loading increases.
The measured curves provide quantitative evidence for comparing tested systems and checking whether their behavior agrees with mechanical models. Engineers can use the results for quality assessment and for designing structures or devices that must withstand mechanical stress. Because the protocol identifies response characteristics and limiting thresholds, it connects experimental measurements with performance requirements.