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Related Concept Videos

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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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.
270
Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Thin-Walled Hollow Shafts01:15

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

219
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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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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Related Experiment Video

Updated: Jul 8, 2025

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Lithospheric thickness records tectonic evolution by controlling metamorphic conditions.

Zhen-Jie Zhang1,2,3, Guo-Xiong Chen4, Timothy Kusky4

  • 1School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.

Science Advances
|December 15, 2023
PubMed
Summary
This summary is machine-generated.

Lithospheric thickness, the Earth

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Area of Science:

  • Geology and Geophysics
  • Earth System Science
  • Tectonics and Geodynamics

Background:

  • The lithosphere's outermost solid layer holds Earth's geological history, but its early records are fragmented.
  • Understanding lithospheric thickness evolution and its tectonic impacts is crucial but currently limited.

Purpose of the Study:

  • To reconstruct the history of lithospheric thickness.
  • To investigate the relationship between lithospheric thickness and tectonic events.
  • To understand the feedback mechanisms between lithosphere and crustal processes.

Main Methods:

  • Machine learning applied to global lithogeochemical basalt data.
  • Analysis of lithospheric thickness variations over geological time.
  • Cross-correlation of lithospheric thickness with metamorphic thermal gradients.

Main Results:

  • Identified four major lithospheric thinning events in the Paleoarchean, early Paleoproterozoic, Neoproterozoic, and Phanerozoic.
  • These thinning events correlate with supercontinent/supercraton breakup and assembly cycles.
  • Crustal metamorphic and deformation styles were found to be a feedback of lithospheric thickness.

Conclusions:

  • Lithospheric thickness evolution is intrinsically linked to supercontinent cycles.
  • The transition in subduction systems and the emergence of thick continents influenced supercontinent assembly.
  • This study provides a new framework for understanding early Earth tectonic evolution.