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Related Concept Videos

Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

692
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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Plasticity00:58

Plasticity

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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...
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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.
The Maximum Shearing Stress Criterion, also known as...
158
Plastic Deformations01:19

Plastic Deformations

127
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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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

146
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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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

260
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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Fused Filament Fabrication FFF of Metal-Ceramic Components
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Borrowed dislocations for ductility in ceramics.

L R Dong1,2,3, J Zhang2, Y Z Li3

  • 1MOE Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, China.

Science (New York, N.Y.)
|July 25, 2024
PubMed
Summary
This summary is machine-generated.

Ceramics are brittle due to limited atomic movement. A new "borrowing-dislocations" strategy enhances ceramic plasticity by transferring dislocations from metals via interfaces, improving tensile ductility.

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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Mechanical Engineering

Background:

  • Ceramics exhibit inherent brittleness due to restricted atomic motion in rigid structures.
  • This brittleness limits dislocation nucleation, hindering plasticity enhancement strategies common in metals.

Purpose of the Study:

  • To overcome the challenge of poor dislocation nucleation in ceramics.
  • To develop a novel strategy for enhancing the tensile ductility of ceramics.

Main Methods:

  • Proposing a "borrowing-dislocations" strategy utilizing tailored interfacial structures.
  • Facilitating dislocation transfer from metals to ceramics through engineered interfaces.

Main Results:

  • Mobilized a significant number of dislocations in ceramics by borrowing them from metals.
  • Achieved greatly improved tensile ductility in ceramics.

Conclusions:

  • The "borrowing-dislocations" strategy effectively enhances ceramic plasticity.
  • This approach offers a new pathway for improving tensile ductility in brittle ceramic materials.