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Related Concept Videos

Fatigue01:21

Fatigue

263
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...
263
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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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

340
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
340
Euler's Formula to Columns: Problem Solving01:23

Euler's Formula to Columns: Problem Solving

502
Euler's formula is used in structural engineering to determine the buckling load of columns under various conditions. However, when dealing with systems that incorporate both rigid elements and elastic components, such as springs, the analysis requires a finer approach to determine the critical load. The problem described involves two rigid bars connected at a pivot point with a spring attached and a vertical load applied at one end.
The system comprises two vertical rigid bars, AB and BC,...
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Design of Columns under a Centric Load01:17

Design of Columns under a Centric Load

198
The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
198
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

241
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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Mixed-Mode Crack Growth Behavior of Compact Tension Shear (CTS) Specimens: A Study on the Impact of the Fatigue Stress Ratio, Loading Angle, and Geometry Thickness.

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Fatigue Crack Growth Analysis under Constant Amplitude Loading Using Finite Element Method.

Abdulnaser M Alshoaibi1

  • 1Mechanical Engineering Department, Faculty of Engineering, Jazan University, P.O. Box 114, Jazan 45142, Saudi Arabia.

Materials (Basel, Switzerland)
|April 23, 2022
PubMed
Summary

This study used advanced numerical methods to predict fatigue crack growth, finding that stress ratio significantly impacts crack path and extends fatigue life. Higher stress ratios reduce stress and increase the number of cycles before failure.

Keywords:
ANSYSconstant amplitude loadingequivalent stress intensity factorfatigue analysislinear elastic fracture mechanics

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Computational Mechanics

Background:

  • Damage-tolerant design requires accurate prediction of fatigue crack growth under cyclic loading.
  • Understanding crack propagation is crucial for structural integrity and safety.

Purpose of the Study:

  • To numerically analyze fatigue crack growth using ANSYS Mechanical.
  • To investigate the influence of stress ratio on crack path, stress intensity factors, and fatigue life.
  • To validate simulation findings with existing literature.

Main Methods:

  • Utilized Separating Morphing and Adaptive Remeshing Technology (SMART) with Unstructured Mesh Method (UMM).
  • Performed numerical analysis on a modified compact tension specimen under constant amplitude loading.
  • Investigated stress ratios from 0 to 0.8 for linear elastic, isotropic materials.

Main Results:

  • Fatigue life and von Mises stress distribution are significantly influenced by stress ratio.
  • Increased stress ratio led to decreased von Mises stress and rapidly increased fatigue life cycles.
  • Crack propagation path is influenced by pre-crack location, often attracted to or bypassing holes.

Conclusions:

  • The numerical model accurately predicts crack propagation paths, validated by literature.
  • Stress ratio is a critical parameter affecting fatigue behavior and structural durability.
  • SMART and UMM offer a robust approach for fatigue crack growth simulation.