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Related Concept Videos

True Stress and True Strain01:28

True Stress and True Strain

Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
General State of Stress01:21

General State of Stress

The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...
Stress-Strain Diagram01:10

Stress-Strain Diagram

A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This change in...
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...

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Related Experiment Video

Updated: May 28, 2026

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation
07:50

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation

Published on: January 27, 2023

Protocol for inferring mechanical stresses in tissues using ForSys, an open-source Python tool.

Augusto Borges1, Jerónimo R Miranda-Rodríguez2, Alberto S Ceccarelli3

  • 1Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2, UK.

STAR Protocols
|May 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces ForSys, an open-source Python tool for computational stress inference in tissues. It provides a protocol for estimating mechanical tissue states non-invasively, aiding biomechanical research.

Keywords:
BioinformaticsBiophysicsDevelopmental biologySystems biologyTissue Engineering

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Area of Science:

  • Biomechanical Engineering
  • Computational Biology
  • Tissue Mechanics

Background:

  • Estimating mechanical stress in tissues is crucial for understanding tissue function and disease.
  • Traditional methods often involve invasive procedures, limiting their applicability.
  • Computational approaches offer a non-invasive alternative for stress inference.

Purpose of the Study:

  • To present a detailed protocol for inferring mechanical stresses in biological tissues.
  • To introduce ForSys, an open-source Python tool designed for this purpose.
  • To guide users through the installation, usage, and data analysis steps.

Main Methods:

  • Utilizing ForSys, an open-source Python tool for computational stress inference.
  • Describing the setup of the Python environment and the use of command-line and graphical user interfaces (GUI).
  • Detailing data import, correction of time-point connections, scale parameter determination, and result visualization.

Main Results:

  • Successful implementation of a protocol for non-invasive stress inference in tissues.
  • Demonstration of ForSys's capabilities in preparing data, performing calculations, and quantifying results.
  • Provision of a reproducible workflow for researchers in biomechanics and related fields.

Conclusions:

  • ForSys provides a rapid and accessible computational method for tissue stress inference.
  • The presented protocol enables researchers to estimate mechanical tissue states without invasive experiments.
  • This work facilitates advancements in understanding tissue mechanics and developing computational models.