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Fatigue01:21

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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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An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
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Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys.

Roman Aigner1, Martin Leitner2, Michael Stoschka3

  • 1Christian Doppler Laboratory for Manufacturing Process based Component Design, Chair of Mechanical Engineering, Montanuniversität Leoben, 8700 Leoben, Austria. roman.aigner@unileoben.ac.at.

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Summary

This study introduces a defect-based fatigue design model for cast parts, incorporating micro shrinkage pores. The enhanced model accurately predicts fatigue strength in both finite-life and long-life regimes, validating a unified approach for cast aluminium alloys.

Keywords:
aluminium castingcomputed tomographydefectsextreme value statisticsfatigue assessmentstatistical distribution

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metallurgy

Background:

  • Cast parts often contain internal defects like micro shrinkage pores from manufacturing.
  • Assessing fatigue behavior in both finite-life and long-life regions is crucial for component design.
  • Existing models may not fully capture the influence of defects on fatigue life.

Purpose of the Study:

  • To develop a scientifically robust, defect-based fatigue design model for cast components.
  • To accurately predict fatigue behavior across finite-life and long-life regimes.
  • To extend Tiryakioglu's fatigue assessment approach for unified analysis.

Main Methods:

  • Conducting extensive fatigue and fracture mechanical tests.
  • Fractographic evaluation of crack-initiating defect size populations.
  • Utilizing in situ X-ray computed tomography for lifetime estimation until crack initiation.
  • Modifying Tiryakioglu's approach by incorporating the long crack threshold value.

Main Results:

  • The defect-based fatigue design model showed good agreement with experimental fatigue test results.
  • The model achieved minor deviations: up to ~5% for long-life fatigue strength and ~9% for finite-lifetime.
  • The modified Tiryakioglu's approach successfully enabled fatigue strength assessment in the long-life regime.

Conclusions:

  • The proposed defect-based fatigue design model provides a unified approach for assessing fatigue strength in cast aluminium alloys.
  • The extension of Tiryakioglu's method enhances accuracy for both finite- and long-life fatigue predictions.
  • This research contributes to improved design strategies for fatigue-critical cast components.