Stress Relaxation Analysis
Stress Relaxation Analysis - Related Videos
08:07
Investigating Stress-relaxation and Failure Responses in the Trachea
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Cited by 1 •
2022
The present protocol determines the tensile stress-relaxation and failure properties of porcine tracheae. Results from such methods can help improve the understanding of the viscoelastic and failure thresholds of the trachea and help advance the capabilities of computational models of the pulmonary system.
11:05
Analysis of Oxidative Stress in Zebrafish Embryos
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Cited by 97 •
2014
Here we report a protocol to measure oxidative stress in living zebrafish embryos. This procedure allows reactive oxygen species (ROS) detection in both whole embryo tissues and single-cell populations. This protocol will accomplish both qualitative and quantitative analyses.
12:22
Mindfulness in Motion (MIM): An Onsite Mindfulness Based Intervention (MBI) for Chronically High Stress Work Environments to Increase Resiliency and Work Engagement
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Cited by 105 •
2015
The Mindfulness in Motion (MIM) protocol offers a pragmatic Mindfulness Based Intervention (MBI) on-site, for persons working in chronically high-stress work environments that significantly increases resiliency and work engagement. The protocol has proven feasible, beneficial, and is easily adaptable to other high-stress workplaces.
01:29
Relaxation of Skeletal Muscles
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2024
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions. When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
03:50
Microscopic Analysis of Bacterial Growth Under Stress Using Microfluidic Chambers
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2025
Source: Cayron, J., et al. Multi-scale Analysis of Bacterial Growth Under Stress Treatments. J. Vis. Exp. (2019).This video demonstrates how to prepare and use a microfluidic plate for imaging bacterial cells under stress conditions. It outlines the process of introducing a bacterial culture and a stress-inducing antibiotic medium, followed by cell loading and microscopic setup. Time-lapse imaging in phase-contrast mode is then used to observe the development of elongated, filamentous cells...
FAQs
The fixed deformation removes changes in specimen shape as the primary test condition, so the measured decline in force or stress reflects internal rearrangement over time. Polymer chains, fluid phases, or tissue microstructures can redistribute the applied load, producing a time-dependent response. This separates immediate mechanical resistance from slower relaxation behavior relevant to material performance.
Stress decay depends on how polymer chains, fluid phases, and tissue microstructures rearrange after the specimen reaches its prescribed deformation. These constituents can contribute differently to the measured response, causing some materials to lose stress more rapidly than others. Examining the resulting curve therefore provides information about internal organization and time-dependent mechanical behavior.
Relaxation time describes the timescale associated with the decline in measured stress after deformation is maintained. A response that changes over a shorter or longer period can indicate how quickly the material’s internal constituents accommodate the imposed strain. Quantifying this behavior helps researchers assess material stability and anticipate performance during sustained loading.
The method provides a common stress-versus-time framework for comparing materials whose internal structures differ substantially. Hydrogels, engineered tissues, biomaterials, and biological samples may show different relaxation patterns because their polymer, fluid, or tissue components rearrange in distinct ways. These differences help characterize mechanical behavior without relying only on an initial deformation measurement.
A specimen is rapidly strained to a selected fixed deformation, and that deformation is then maintained while force or stress is recorded over time. The measured decline is organized as a stress-versus-time response, from which researchers evaluate relaxation behavior, relaxation time, and material stability. Consistent deformation and time recording are central to interpreting the result.
A stress-versus-time response shows how mechanical resistance changes after the initial deformation rather than reporting only an immediate value. Its decline can reveal time-dependent behavior, support quantification of viscoelastic properties and relaxation time, and indicate how stable the material remains while deformation is sustained. This information is useful when constant loading conditions matter.
Bioengineers apply the method when they need to evaluate hydrogels, biomaterials, engineered tissues, or biological samples under sustained deformation. The results can help assess mechanical compatibility, predict deformation during continued loading, and guide the design of implants and regenerative medicine platforms. In this context, time-dependent behavior becomes a design consideration rather than a secondary measurement.