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Related Concept Videos

Fatigue01:21

Fatigue

220
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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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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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...
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Design Consideration01:22

Design Consideration

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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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Design of Transmission Shafts - Stress Analysis01:15

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Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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Fatigue Life Prediction of Notched Details Using SWT Model and LEFM-Based Approach.

Rui Hao1, Zongyi Wen1,2, Haohui Xin3

  • 1Department of Civil Engineering, Aalto University, 02150 Espoo, Finland.

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|March 11, 2023
PubMed
Summary
This summary is machine-generated.

Predicting fatigue crack initiation in steel bridges is crucial. This study developed a numerical model using XFEM and SWT to accurately estimate fatigue life in notched steel components, showing good agreement with experimental data.

Keywords:
UDMGINIXFEMfatiguefatigue life predictionnumerical simulation

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Civil Engineering

Background:

  • Fatigue crack initiation significantly impacts the total fatigue life of steel components.
  • Accurate prediction of fatigue crack initiation is essential for structural integrity, especially in orthotropic steel deck bridges.

Purpose of the Study:

  • To develop and validate a numerical model for predicting fatigue crack initiation life in notched steel details.
  • To assess the efficacy of the extended finite element method (XFEM) combined with the Smith-Watson-Topper (SWT) model for high-cycle fatigue analysis.

Main Methods:

  • A numerical model was established using the extended finite element method (XFEM) and the Smith-Watson-Topper (SWT) model.
  • A novel algorithm was implemented via the Abaqus UDMGINI subroutine to compute the SWT damage parameter under high-cycle fatigue.
  • The virtual crack-closure technique (VCCT) was employed to monitor crack propagation.

Main Results:

  • The proposed XFEM model, incorporating UDMGINI and VCCT, reasonably predicted fatigue lives for notched specimens under high-cycle fatigue (load ratio 0.1).
  • Fatigue initiation life prediction errors ranged from -27.5% to 41.1%.
  • Total fatigue life predictions showed good agreement with experimental results, with a scatter factor of approximately 2.

Conclusions:

  • The developed XFEM-based numerical model provides a reliable approach for predicting fatigue crack initiation and total fatigue life in notched steel components.
  • The integration of UDMGINI for SWT parameter calculation and VCCT for crack monitoring enhances the accuracy of fatigue life assessments in structural engineering applications.