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Related Concept Videos

Fatigue01:21

Fatigue

218
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...
218
Euler's Formula to Columns: Problem Solving01:23

Euler's Formula to Columns: Problem Solving

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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,...
311
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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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...
453
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

235
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...
235
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

240
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
240
Residual Stresses in Bending01:18

Residual Stresses in Bending

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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Related Experiment Video

Updated: Aug 5, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Fatigue Life Modelling of Steel Suspension Coil Springs Based on Wavelet Vibration Features Using Neuro-Fuzzy

C H Chin1, S Abdullah1, S S K Singh1

  • 1Department of Mechanical and Manufacturing Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.

Materials (Basel, Switzerland)
|March 29, 2023
PubMed
Summary

This study introduces wavelet-based methods to predict coil spring durability using vibration features, offering a faster and more accurate alternative to traditional strain-life approaches for random vibration analysis.

Keywords:
ANFISdurabilitylow-frequency energymultifractalitywavelet transform

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Signal Processing

Background:

  • Conventional strain-life methods for durability prediction are computationally intensive and lack accuracy for random vibration.
  • Existing vibration fatigue methods often provide unsatisfactory results for complex road excitations.
  • Accurate fatigue life prediction models based on vibrational features are necessary for coil spring durability analysis.

Purpose of the Study:

  • To develop and validate wavelet-based approaches for characterizing random vibration road excitations.
  • To establish an accurate fatigue life prediction model for coil springs using vibration features.
  • To reduce the dependency on strain data measurement in fatigue life assessments.

Main Methods:

  • Wavelet-based methods were employed to determine low-frequency energy and multifractality of road excitations.
  • Strain-life models were used for fatigue life evaluation based on strain histories.
  • Adaptive Neuro-Fuzzy Inference System (ANFIS) modeling was utilized to link vibration features with fatigue life.

Main Results:

  • Wavelet-based methods effectively characterized signal energy and multifractality in vibration signals.
  • The developed vibration-based models demonstrated good fatigue life conservativity (>90% data survivability).
  • The Morrow-based model achieved a high Pearson coefficient (0.955) and low RMSE (0.660).

Conclusions:

  • Low-frequency energy and multifractality of vibration signals are viable fatigue-related features for coil spring life prediction.
  • The proposed vibration-based model offers an acceptable and efficient method for fatigue life prediction.
  • This approach reduces the need for extensive strain data acquisition in durability assessments.