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Related Concept Videos

Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
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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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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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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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Yield Criteria for Ductile Materials under Plane Stress01:25

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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.
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Related Experiment Video

Updated: Aug 26, 2025

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
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Inhibiting weld cracking in high-strength aluminium alloys.

Yanan Hu1,2, Shengchuan Wu3,4, Yi Guo5

  • 1State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, PR China.

Nature Communications
|October 3, 2022
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Summary

Cracking in 7000 series aluminum alloy welds is caused by brittle AlCuMg phases. A new hybrid welding technique improves the fine equiaxed zone (FQZ) structure, significantly increasing tensile strength.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Welding Engineering

Background:

  • Welding 7000 series aluminum alloys is prone to cracking, particularly within the fine equiaxed zone (FQZ).
  • Understanding the microstructural mechanisms leading to intergranular failure in the FQZ is crucial for improving weld integrity.

Purpose of the Study:

  • To investigate the strengthening mechanisms and intergranular failure in the FQZ of 7000 series aluminum alloy welds.
  • To develop and validate a novel hybrid welding strategy to mitigate cracking and enhance tensile strength.

Main Methods:

  • Employed a multiscale correlative methodology, spanning from millimeter to nanoscale analysis.
  • Investigated microstructural features, including precipitate distribution and phase characteristics within the FQZ.
  • Utilized a hybrid welding strategy combining laser beam oscillation and a pulsed magnetic field.

Main Results:

  • Identified intergranular AlCuMg phases as the primary cause of cracking via micro-void nucleation and linkage.
  • Demonstrated that plastic incompatibility between hard phases and soft grain interiors in the FQZ leads to failure.
  • The proposed hybrid welding strategy resulted in a wavy and interrupted FQZ with increased precipitate density.

Conclusions:

  • The hybrid welding strategy effectively mitigates cracking in 7000 series aluminum alloy welds.
  • The enhanced FQZ microstructure significantly increases tensile strength compared to conventional methods, including friction stir welding.