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Related Concept Videos

Fatigue01:21

Fatigue

888
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...
888
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

623
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...
623
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

603
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...
603
Strain-Energy Density01:20

Strain-Energy Density

987
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
987
True Stress and True Strain01:28

True Stress and True Strain

897
Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
897
Design Consideration01:22

Design Consideration

598
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...
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Updated: Feb 25, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

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A Fatigue Life Prediction Method Based on Strain Intensity Factor.

Wei Zhang1, Huili Liu2, Qiang Wang3

  • 1School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China. zhangwei.dse@buaa.edu.cn.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a strain intensity factor method for fatigue crack growth analysis under fully reversed loading. This new approach offers improved accuracy over the stress intensity factor, particularly for materials like 316 austenitic stainless steel.

Keywords:
crack growthfatigue lifefully reversednonlinearstrain intensity factor

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Fracture Mechanics

Background:

  • Fatigue crack growth is critical in structural integrity.
  • Stress intensity factor (SIF) is a common parameter, but has limitations under certain loading conditions.
  • Cyclic stress-strain behavior is nonlinear, especially at negative stress ratios.

Purpose of the Study:

  • To propose and validate a strain intensity factor-based method for fatigue crack growth calculation.
  • To demonstrate the superiority of strain intensity factor over SIF for fully reversed loading.
  • To analyze fatigue crack propagation in metallic materials under specific conditions.

Main Methods:

  • Theoretical analysis to correlate strain intensity factor with fatigue crack growth rate.
  • Development of a transformation algorithm between SIF and strain intensity factor.
  • Validation using experimental fatigue crack growth data for 316 austenitic stainless steel and AZ31 magnesium alloy.

Main Results:

  • Strain intensity factor shows a narrower scatter band for crack growth rate compared to SIF.
  • Fatigue crack growth rate is influenced by maximum loading, not just SIF range, under fully reversed conditions.
  • The proposed strain intensity factor method demonstrates better agreement with experimental data.

Conclusions:

  • Strain intensity factor is a more effective driving parameter than SIF for fatigue crack growth under fully reversed loading.
  • The developed method provides a more accurate prediction of fatigue crack propagation.
  • This approach is particularly valuable for low cycle fatigue regions and negative stress ratios.