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Related Concept Videos

Fatigue01:21

Fatigue

180
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...
180
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

697
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...
697
Structural Steel Products01:24

Structural Steel Products

194
Structural steel products are created within a structural mill. The process begins with a beam blank that is reheated and then fed through a series of rollers. These rollers progressively shape the metal into its final form. Adjusting the spacings between the rollers allows for the production of different sections with the same nominal dimensions.
Once shaped, the steel's final form emerges as a continuous length, which is then segmented by a hot saw into manageable pieces. These segments...
194
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

183
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
183
Stress Concentrations01:24

Stress Concentrations

280
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...
280
Design Consideration01:22

Design Consideration

185
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
185

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Updated: Jun 21, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Optimizing Fatigue Performance in Gradient Structural Steels by Manipulating the Grain Size Gradient Rate.

Meichen Pan1, Xin Chen1, Meiling He1

  • 1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
Summary
This summary is machine-generated.

Optimizing gradient structural steel involves controlling the gradient rate to enhance fatigue life. A concave gradient rate, favoring finer grains, significantly extends material durability compared to linear or convex designs.

Keywords:
crack propagationfatiguegradient rategradient structural steel

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Materials Science

Background:

  • Gradient structural steel offers high performance due to unique microstructures.
  • Fatigue failure is a critical concern in engineering applications of this material.
  • The gradient rate, or rate of change in local grain size, is crucial for fatigue performance.

Purpose of the Study:

  • To investigate the effect of different gradient rates on the fatigue performance of structural steel.
  • To establish computational models for analyzing stress-strain response and crack propagation.
  • To identify optimal gradient structures for improved fatigue life.

Main Methods:

  • Developed 'Voronoi primary + secondary modeling' to create three gradient rate models (convex, linear, concave).
  • Simulated stress-strain response and fatigue crack propagation under cyclic loading.
  • Compared fatigue life across different gradient rate structures.

Main Results:

  • The concave gradient rate model, with a higher volume fraction of finer grains, exhibited superior fatigue resistance.
  • Fatigue life was 16.16% longer for the concave model than the linear, and 23.66% longer than the convex model.
  • Simulation results align with experimental observations.

Conclusions:

  • Prioritizing a higher volume fraction of fine grains through concave gradient rate design enhances material fatigue life.
  • This study offers a new strategy for engineering materials with improved service performance.
  • Controlling the gradient rate is key to optimizing fatigue behavior in structural steels.