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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

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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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Stress Concentrations01:24

Stress Concentrations

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Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
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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.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

707
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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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.
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Updated: Jun 26, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Effect of Fusion Boundary Microstructure on Flow-Accelerated Corrosion Cracking.

Yajing Wang1,2, Zhe Lyu1, Zhisheng Wu2

  • 1Department of Chemical & Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.

Materials (Basel, Switzerland)
|May 11, 2024
PubMed
Summary
This summary is machine-generated.

Flow-accelerated corrosion preferentially attacks steam pipe welds at the fusion boundary. This occurs due to depleted alloying elements and specific grain textures, making the weld the weakest link.

Keywords:
flow-accelerated corrosionfusion boundaryheat-affected zonemicrostructuresteam pipe

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Area of Science:

  • Materials Science
  • Corrosion Engineering
  • Metallurgy

Background:

  • Flow-accelerated corrosion (FAC) is a significant degradation mechanism in steam pipe systems.
  • FAC commonly targets the heat-affected zone of root-pass welds, compromising structural integrity.

Purpose of the Study:

  • To identify the precise initiation sites and underlying mechanisms of FAC in steam pipe girth welds.
  • To characterize the microstructural and chemical features at the weld fusion boundary contributing to FAC susceptibility.

Main Methods:

  • Detailed microstructural characterization of affected weld regions.
  • Analysis of elemental composition and phase transformations along the weld fusion boundary.
  • Texture analysis to identify preferred crystallographic orientations.

Main Results:

  • The fusion boundary of the root-pass weld was confirmed as the preferential initiation site for FAC.
  • Depletion of alloying elements and an increased proportion of Goss {110}<001> textured grains were observed at the fusion boundary.
  • These microstructural features suggest a synergistic effect contributing to FAC initiation.

Conclusions:

  • The weld fusion boundary represents the weakest link for FAC attack in steam pipe girth welds.
  • Chemical segregation and specific crystallographic texture (Schmid factor) at the fusion boundary synergistically promote FAC initiation.
  • Understanding these mechanisms is crucial for developing mitigation strategies against FAC in power plants.