Prediction and Control of Heat Treat Distortion of Helicopter Gears.

Abstract

A helicopter gear heat treatment distortion modelling approach was developed using a commercially available finite element program. The model. predicts distortion and residual stresses resulting from carburization, harden/quench and temper processes performed on gears fabricated from 9310 steel. Accurate prediction of heat treatment distortion could aid in the design of gears, heat treatment processes and quench dies to reduce distortion. This would result in a significant reduction in scrap and rework for new gear designs. The model development included the development of constitutive equations, gathering of materials property data and determination of heat transfer coefficients. The model was demonstrated on a simple flat disk geometry and a rim/web/accessory gear blank. Model results are compared to experimental heat treatments of these configurations.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1995
Accession Number
ADA314275

Entities

People

  • R. Stingfellow

Organizations

  • Arthur D. Little

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Computational Science
  • Critical Temperature
  • Crystal Structure
  • Experimental Design
  • Finite Element Analysis
  • Heat Transfer
  • Heat Transfer Coefficients
  • Heat Treatment
  • Latent Heat
  • Materials
  • Measurement
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Phase Transformations
  • Surface Temperature
  • Thermal Conductivity

Fields of Study

  • Materials science

Readers

  • Aerodynamics.
  • Computational Modeling and Simulation
  • Metallurgy