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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

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Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
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Microcracking in Concrete01:20

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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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.
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Shearing Strain01:20

Shearing Strain

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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 the...
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Asynchronous cracking with dissimilar paths in multilayer graphene.

Bongkyun Jang1, Byungwoon Kim, Jae-Hyun Kim

  • 1Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan.

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Summary
This summary is machine-generated.

Multilayer graphene exhibits unique crack propagation and interlayer slippage, enhancing its fracture toughness. This discovery offers insights for designing robust graphene-based composite materials.

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Area of Science:

  • Materials Science
  • Mechanics of Materials
  • Nanotechnology

Background:

  • Multilayer graphene, composed of stacked graphene sheets, presents novel fracture mechanics.
  • Understanding its mechanical behavior is crucial for advanced material design.

Purpose of the Study:

  • To investigate the fracture behavior of single-crystalline multilayer graphene.
  • To identify and characterize abnormal crack propagation mechanisms.
  • To determine the fracture toughness and toughening mechanisms.

Main Methods:

  • In situ mode I fracture testing under scanning electron microscopy.
  • Load-displacement curve analysis.
  • Finite element modeling of specimen geometries.

Main Results:

  • Observed asynchronous crack propagation along independent paths in multilayer graphene.
  • Identified interlayer shear stress and slippage as key factors.
  • Quantified enhanced fracture toughness attributed to energy dissipation via interlayer slippage.

Conclusions:

  • Asynchronous cracking and interlayer slippage represent a unique toughening mechanism in multilayer graphene, distinct from monolayer graphene.
  • This finding provides valuable insights for developing graphene composites for structural applications.