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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

568
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
568
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

570
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
570
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

713
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
713
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

622
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
622
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

556
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
556
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

443
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
443

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Related Experiment Video

Updated: Mar 27, 2026

Applying Permanent, Robust Stenciled Patterns of Fine Particles to Elastomeric Surfaces
07:12

Applying Permanent, Robust Stenciled Patterns of Fine Particles to Elastomeric Surfaces

Published on: July 8, 2025

585

Surface deformation tracking and modeling of soft materials.

Matthew D Parker, Thiranja P Babarenda Gamage, Amir HajiRassouliha

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary

    This study validates a novel method for tracking skin surface deformations. The technique accurately measures tissue mechanics, advancing applications in burn treatments and artificial skin development.

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    Quantification of Strain in a Porcine Model of Skin Expansion Using Multi-View Stereo and Isogeometric Kinematics
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    Area of Science:

    • Biomaterials Science
    • Mechanical Engineering
    • Medical Imaging

    Background:

    • Accurate characterization of soft tissue mechanical properties is crucial for advancements in reconstructive surgery, burn treatments, artificial skin development, and early disease detection.
    • Current methods for measuring surface deformations in soft tissues require validation for reliable application.

    Purpose of the Study:

    • To validate a phase-based cross-correlation method for material point tracking in soft tissues.
    • To assess the accuracy of this method in measuring surface deformations using a silicone gel phantom.

    Main Methods:

    • A silicone gel phantom was used to validate a phase-based cross-correlation technique for tracking speckle patterns on soft tissue surfaces.
    • Independent fluorescent microsphere markers were employed to validate the accuracy of the speckle pattern tracking.
    • A finite element mesh was deformed based on tracked speckle patterns to predict marker locations, which were then compared to stereo-reconstructions.

    Main Results:

    • The validated tracking method achieved a discrepancy of 23 μm between predicted and reconstructed microsphere locations under a 2900 μm indentation with 125 μm root-mean-square (rms) displacements.
    • The method demonstrated its utility in identifying mechanical properties by reproducing surface deformations with an rms error of 172 μm using a force-driven finite element mesh and a Neo-Hookean constitutive model.

    Conclusions:

    • The phase-based cross-correlation method provides a validated and accurate approach for measuring surface deformations in soft tissues.
    • This technique holds significant potential for improving surgical outcomes, burn treatments, artificial skin development, and disease diagnostics through precise mechanical property characterization.