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Related Concept Videos

Residual Stresses01:26

Residual Stresses

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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
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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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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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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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High Reversible Strain in Nanotwinned Metals.

Suyun He1, Binbin Jiang1, Chunyang Wang1

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China.

ACS Applied Materials & Interfaces
|September 20, 2021
PubMed
Summary

Nanotwinned metals with ultra-thin twin lamellae exhibit ultrahigh reversible strain up to 7.8%. This breakthrough in materials science enhances shape recoverability, paving the way for advanced flexible electronics.

Keywords:
HAADF-STEMTEMdislocationsnanotwinned metalsreversible strainstrain analysis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Development of bulk metals with large reversible strain is crucial for flexible electronic devices.
  • Nanometer-scale twins in metals offer high strength, ductility, and electrical conductivity.

Purpose of the Study:

  • To investigate ultrahigh reversible strain in nanotwinned metals.
  • To explore the relationship between twin lamella thickness and reversible strain.
  • To assess the impact of nanotwinning on the shape recoverability of metals.

Main Methods:

  • Fabrication of nanotwinned metals with varying twin lamella thicknesses.
  • In situ transmission electron microscopy (TEM) for observing deformation mechanisms.
  • Bending deformation experiments on twinned and twin-free gold (Au) nanorods.

Main Results:

  • Observed ultrahigh reversible strain of approximately 7.8% in bent twin lamellae (1-2 nm thickness).
  • Demonstrated that maximum reversible strain increases as twin lamella thickness decreases.
  • Attributed high reversible strain to suppressed dislocation nucleation in bent twin lamellae.
  • Showed significantly improved shape recoverability in twinned Au nanorods compared to twin-free ones.

Conclusions:

  • Ultra-thin twin lamellae are key to achieving large reversible strain in bulk metals.
  • Nanotwinning offers a novel pathway for developing materials with enhanced shape recoverability for flexible electronics.
  • Suppression of dislocation nucleation is the primary mechanism for high reversible strain in these materials.