Stress Analysis of Metallic Rocket - Motor Cases Reinforced with a Viscoelastic Fibre Overwind,

Abstract

Analytical stress solutions are presented for a metallic rocket motor case reinforced with a prestrained fibre overwind, with viscoelastic properties, under both constant and varying temperature histories. The treatment is in terms of the 'reduced time' proposed by Schwarzl and Staverman, with the Williams/Landel/Ferry form of the 'shift function'. The analysis is reduced to the solution of a Volterra integral equation. For a constant temperature history and using the 'standard linear solid' representation of the material properties of the overwind, this equation can be solved in closed form. For varying temperature histories the equation is solved using a finite-difference technique proposed by Lee and Roger and improved by Margetson. The effects of fibre relaxation on the internal pressure required for the initiation of yield in the motor case are evaluated and discussed for a number of temperature histories and end conditions.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1986
Accession Number
ADA169871

Entities

People

  • A. Groves
  • J. Margetson
  • P. Stanley

Tags

DTIC Thesaurus Topics

  • Climate Change
  • Composite Materials
  • Constitutive Equations
  • Delphi Method
  • Differential Equations
  • Equations
  • Integral Equations
  • Internal Pressure
  • Linear Differential Equations
  • Materials
  • Mechanical Properties
  • Modulus Of Elasticity
  • Numerical Analysis
  • Rocket Engines
  • Stress Analysis
  • Stresses
  • Time Intervals

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Mechanical Engineering/Mechanics of Materials.
  • Reinforced Composite Materials