Consideration of Wear Rates at High Velocities

Abstract

The goal of this research is to study sliding contact wear of test sled slippers at high velocities. Experimentation representative of the slippers is infeasible, so numerical studies are used. An Eulerian-Lagrangian hydrocode called CTH is used to study mechanical wear. Failure criteria have been established to evaluate the stresses and strains resulting from the hydrocode simulation of a single asperity collision. The results from the hydrocode simulations are scaled to account for slipper bounce and multiple asperities, and these results produce total wear values that are approximately 90% of total experimental wear. Slipper thermodynamics have also been evaluated. The fraction of frictional heating energy entering the slipper has been evaluated, and an average value of approximately 0.125 has been determined. Total wear for a slipper reaching 3,000 m/s and following a typical slipper velocity profile has been evaluated to range from 3 to 6% of the total slipper volume.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2010
Accession Number
ADA517645

Entities

People

  • Stephen P. Meador

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Autonomy
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Constitutive Equations
  • Convection
  • Equations Of State
  • Failure Mode And Effect Analysis
  • Heat Energy
  • Heat Transfer
  • Measurement
  • Mechanics
  • Temperature Gradients
  • Thermodynamics
  • Three Dimensional
  • Two Dimensional
  • United States Government

Readers

  • Computational Fluid Dynamics (CFD)
  • Explosive Engineering.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).