Accession Number : ADA314275

Title :   Prediction and Control of Heat Treat Distortion of Helicopter Gears.

Descriptive Note : Final rept. un 92-May 95,

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MA

Personal Author(s) : Stingfellow, R.

PDF Url : ADA314275

Report Date : AUG 1995

Pagination or Media Count : 194

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.

Descriptors :   *COMPUTER PROGRAMS, *COMPUTERIZED SIMULATION, *PREDICTIONS, *HEAT TREATMENT, *AIRCRAFT EQUIPMENT, *GEARS, CONTROL, MATERIALS, FINITE ELEMENT ANALYSIS, ACCURACY, DIES, HELICOPTERS, RESIDUAL STRESS, GEOMETRY, DISKS, EQUATIONS, HEAT, AIRCRAFT MODELS, DISTORTION, HEAT TRANSFER COEFFICIENTS, CARBURIZING.

Subject Categories : Helicopters
      Computer Programming and Software
      Machinery and Tools
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE