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Related Concept Videos

Shearing Strain01:20

Shearing Strain

1.8K
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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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.
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Generalized Hooke's Law01:22

Generalized Hooke's Law

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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Hooke's Law01:26

Hooke's Law

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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 Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Strain Rate Dependent Shear Plasticity in Graphite Oxide.

Soumya Vinod1, Chandra Sekhar Tiwary1, Leonardo D Machado2

  • 1Department of Materials Science and Nanoengineering, Rice University , Houston, Texas 77005, United States.

Nano Letters
|January 8, 2016
PubMed
Summary

Plasticity in graphene oxide films can be controlled by adjusting the strain rate. Lowering the strain rate causes a transition from brittle to ductile behavior in these functionalized layered materials.

Keywords:
Graphene oxideMD simulationbrittle-ductile transitionstick−slipstrain rate

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Graphene oxide (GO) films consist of stacked graphene layers with inherent chemical functionalities.
  • Understanding the mechanical properties, particularly plasticity, of these layered systems is crucial for their applications.

Purpose of the Study:

  • To investigate the influence of strain rate on the plasticity and deformation behavior of graphene oxide films.
  • To explore the transition from brittle to ductile deformation in functionalized layered materials.

Main Methods:

  • Experimental characterization of stress-strain behavior under varying strain rates.
  • Theoretical modeling to understand deformation mechanisms.

Main Results:

  • Plasticity in graphene oxide films is significantly influenced by strain rate tuning.
  • Deformation is dominated by inter-layer shear slip and functional group interactions.
  • A clear transition from brittle to ductile behavior is observed with decreasing strain rate.

Conclusions:

  • Strain rate is a critical parameter for engineering the plasticity of graphene oxide films.
  • The findings provide insights into the mechanical response of functionalized layered nanomaterials.
  • This work offers potential for designing materials with tailored mechanical properties for specific applications.