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Summary
This summary is machine-generated.

This study models crack propagation in thermoplastic bearings under mixed-mode loading. Internal defects significantly influence stress intensity factors, but friction effects are negligible, aiding lifetime predictions.

Keywords:
bearing elementcrack propagationfinite element methodfracture mechanicsstress intensity factorthermoplastic material

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Tribology

Background:

  • Thermoplastic cylindrical bearing elements are prone to crack propagation from internal defects.
  • Crack propagation occurs under complex mixed-mode loading conditions (Modes I, II, and III).
  • The interplay of these loading modes changes dynamically during element rotation.

Purpose of the Study:

  • To analyze crack propagation from internal defects in thermoplastic cylindrical bearings.
  • To develop a model for stress intensity factor dependency on crack length and internal voids.
  • To evaluate the influence of manufacturing defects and crack face friction on crack behavior.

Main Methods:

  • Development of general parametric equations to describe stress intensity factors.
  • Modification of the model to include a void simulating a manufacturing defect.
  • Analysis of mixed-mode crack propagation under combined tensile and shear loading.

Main Results:

  • The presence of a void significantly impacts stress intensity factor values.
  • This void influence diminishes as the crack propagates away from the defect.
  • Friction between crack faces was found to have a negligible effect on stress intensity factors.

Conclusions:

  • The developed model provides a simplified approach to predict bearing element lifetime.
  • Results can be directly applied for lifetime calculations, avoiding complex finite element simulations.
  • Understanding defect influence is crucial for enhancing the durability of thermoplastic bearing elements.