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Related Concept Videos

Shearing Strain01:20

Shearing Strain

586
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
586
Measurements of Strain01:27

Measurements of Strain

1.9K
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...
1.9K
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

280
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
280
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

264
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
264
Transformation of Plane Strain01:12

Transformation of Plane Strain

227
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
227
Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

646
Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
Mohr's circle visually represents the strain states under various conditions, which is essential for...
646

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Related Experiment Video

Updated: Aug 26, 2025

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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A plantar surface shear strain methodology utilising Digital Image Correlation.

Sarah R Crossland1, Heidi J Siddle2, Peter Culmer1

  • 1Department of Mechanical Engineering, University of Leeds, Leeds, UK.

Journal of the Mechanical Behavior of Biomedical Materials
|October 9, 2022
PubMed
Summary
This summary is machine-generated.

A new method accurately measures plantar foot strain, a key factor in diabetic foot ulcer (DFU) development. This technique aids in understanding DFU causes and improving clinical prevention strategies.

Keywords:
DICDiabetesPlantarShearStrain

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Diabetology

Background:

  • Global rise in diabetes leads to increased diabetic foot ulceration (DFU) and amputations.
  • Off-loading is crucial for DFU healing and prevention, yet plantar strain's role remains unclear.
  • Current research focuses on pressure measurement, neglecting strain's contribution to DFU formation.

Purpose of the Study:

  • To develop and assess a novel system for measuring plantar foot strain.
  • To advance understanding of strain's role in diabetic foot ulcer development.
  • To provide clinically relevant metrics for DFU risk assessment.

Main Methods:

  • Developed a Digital Image Correlation (DIC) system using a speckle pattern on the foot's plantar surface.
  • Utilized a transparent walkway and calibrated camera to capture images during the stance phase.
  • Applied 2D DIC and custom analysis to determine plantar strain and derive clinical metrics.

Main Results:

  • Successfully captured continuous plantar surface strain data in a feasibility study with healthy participants.
  • Identified variations in peak and averaged mean strain locations across individuals, from heel to forefoot.
  • Demonstrated the system's ability to map strain characteristics to specific anatomical regions.

Conclusions:

  • The developed DIC method effectively measures plantar skin strain in research and clinical settings.
  • This technique has the potential to significantly improve understanding of DFU etiology.
  • Further research can differentiate healthy from abnormal plantar strain patterns, aiding DFU prevention.