A Simple Screw Thread Model for Use in Finite Element Stress Analysis

Abstract

A technique for modelling screw threads, such as those found on artillery projectiles, has been developed. The model employs a matrix of gap elements which are easier to use and require less computation time than the current method of modelling actual threads with material elements. Structural analysis of projectiles and other ballistic components often require the modelling of screw threads. Typically, many finite elements are required in the immediate vicinity of the joint to accurately define and model a thread. In addition, reconciling the effect of dimensional tolerances of threads is not a simple effort. For example, if an analyst were required to perform a complete analysis of a threaded region, including tolerance considerations, at least four iterations would be required. These would include the mating of large and small pitch diameter male threads (within the tolerance range) with large and small female threads (also within tolerances).

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1989
Accession Number
ADA210233

Entities

People

  • J. M. Bender

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Ammunition
  • Availability
  • Classification
  • Computations
  • Materials
  • Mechanics
  • Munitions
  • Projectiles
  • Screw Threads
  • Screws
  • Security
  • Stress Strain Relations
  • Stress Waves
  • Stresses
  • Structural Analysis
  • Weapons

Readers

  • Computational Modeling and Simulation
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Parallel and Distributed Computing.