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Related Concept Videos

Plasticity00:58

Plasticity

2.7K
Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
2.7K
Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Temperature Dependent Deformation01:12

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...
296
Residual Stresses01:26

Residual Stresses

456
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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Plastic Behavior01:21

Plastic Behavior

418
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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Related Experiment Video

Updated: Dec 6, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Defect reconfiguration in a Ti-Al alloy via electroplasticity.

Shiteng Zhao1,2, Ruopeng Zhang1,2, Yan Chong1,2

  • 1Department of Materials Science and Engineering, University of California, Berkeley, CA, USA.

Nature Materials
|October 6, 2020
PubMed
Summary
This summary is machine-generated.

Pulsed direct current enhances metal formability by altering dislocation behavior, not just heating. This study reveals microstructural changes in Ti-Al alloys, preventing early failure and improving material properties.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid Mechanics

Background:

  • Pulsed direct current (DC) application is known to enhance metal formability.
  • Distinguishing electroplastic effects from Joule heating has been challenging.
  • Ti-Al alloys exhibit reduced ductility at higher temperatures, making them ideal for studying electroplasticity.

Purpose of the Study:

  • To investigate the underlying mechanisms of electroplastic deformation in Ti-Al alloys.
  • To decouple the effects of electropulsing from simple Joule heating.
  • To understand how electropulsing influences dislocation behavior and microstructural evolution.

Main Methods:

  • Mechanical deformation of Ti-Al (7 at.% Al) alloy under electropulsing.
  • Microstructural analysis to observe dislocation morphology and defect configurations.
  • Comparative analysis with cryogenic deformation effects.

Main Results:

  • Electropulsing enhanced cross-slip and promoted a wavy dislocation morphology.
  • Twinning was observed to be enhanced by electropulsing, similar to cryogenic deformation.
  • Dislocation localization into planar slip bands, leading to premature failure, was prevented.

Conclusions:

  • Macroscopic electroplastic behavior in Ti-Al alloys originates from defect-level microstructural reconfiguration.
  • The observed effects cannot be explained by Joule heating alone.
  • Electropulsing offers a novel approach to enhance metal formability through controlled microstructural manipulation.