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Related Concept Videos

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a change in pressure to the resulting relative volume change.
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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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Strain-Energy Density

Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
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Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing
07:07

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Published on: December 13, 2016

Technical note: converting durometer data into elastic modulus in biological materials.

James D Pampush1, David J Daegling, Anna E Vick

  • 1Department of Anthropology, University of Florida, Gainesville, FL 32611, USA. jpampush@ufl.edu

American Journal of Physical Anthropology
|October 13, 2011
PubMed
Summary
This summary is machine-generated.

Field researchers can now accurately measure primate food hardness (H) and stiffness (E) using portable Shore-D durometers. This method reliably quantifies material properties, unlike older Shore-A tools, aiding masticatory studies.

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Area of Science:

  • Primate Ecology
  • Bio-mechanics
  • Materials Science

Background:

  • Quantifying primate food material properties like hardness (H) and elastic modulus (E) is crucial for understanding masticatory biomechanics.
  • Field assessments of these properties are challenging due to the expense and bulkiness of standard laboratory equipment.

Purpose of the Study:

  • To evaluate the utility of portable durometers for field-based measurement of primate food material properties.
  • To provide recommendations for using Shore-D durometers to accurately assess food hardness and stiffness in ecological field studies.

Main Methods:

  • Comparison of Shore-A and Shore-D durometer measurements on various food materials.
  • Assessment of the correlation between Shore-D hardness measurements and elastic modulus (E) for stiffer materials.
  • Evaluation of durometer portability and cost-effectiveness for field research.

Main Results:

  • Shore-D durometers accurately measure hardness (H) in harder, stiffer food items.
  • Shore-D hardness measurements can be reliably converted to elastic modulus (E) for these materials.
  • Shore-A durometers are less accurate for harder, stiffer food items, potentially underestimating mechanical demands.

Conclusions:

  • Shore-D durometers offer a practical and reliable solution for quantifying primate food material properties in field settings.
  • Accurate field measurements of food hardness and stiffness using Shore-D durometers can enhance studies on primate feeding ecology and masticatory adaptation.
  • Recommendations are provided for optimal Shore-D durometer application in primate food property research.