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Related Concept Videos

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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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...
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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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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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...
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Measurements of Strain01:27

Measurements of Strain

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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...
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Variation in Acceleration due to Gravity near the Earth's Surface01:20

Variation in Acceleration due to Gravity near the Earth's Surface

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An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's...
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Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

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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...
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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Mercury's Crustal Thickness and Contractional Strain.

Thomas R Watters1, Peter B James2, Michelle M Selvans1,3

  • 1Center for Earth and Planetary Studies National Air and Space Museum Smithsonian Institution Washington DC USA.

Geophysical Research Letters
|July 21, 2022
PubMed
Summary
This summary is machine-generated.

Mercury

Keywords:
Crustal thicknessMercuryhigh relief ridgelobate scarpmantle flow

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Area of Science:

  • Planetary Science
  • Geology
  • Geophysics

Background:

  • Mercury's crust exhibits global contractional deformation.
  • Lobate thrust fault scarps are widespread, suggesting a cooling interior as the primary stress source.
  • Fault scarps often cluster, deviating from uniform distribution expected from global contraction alone.

Purpose of the Study:

  • To investigate the cause of localized thrust fault clustering on Mercury.
  • To analyze the relationship between crustal thickness and contractional strain.
  • To explore the role of mantle dynamics in shaping Mercury's surface features.

Main Methods:

  • Analysis of contractional strain using two crustal thickness models (CT1 and CT2).
  • Utilized gravity and topography data from the MESSENGER mission.
  • Comparison with terrestrial mantle downwelling processes.

Main Results:

  • Greatest contractional strain is concentrated in crustal regions 50-60 km thick.
  • Clusters of lobate scarps correlate with areas of thicker crust.
  • Evidence suggests localized lithospheric deformation.

Conclusions:

  • Mantle downwelling is a likely contributor to the localization of thrust faults on Mercury.
  • Crustal thickness variations play a key role in concentrating contractional strain.
  • These findings provide insights into Mercury's tectonic evolution and internal processes.