EXPERIMENTAL FRACTURE STUDIES AND EQUATION-OFSTATE MEASUREMENTS

Abstract

Studies of crack-propagation rates in plastics and polycrystalline aluminum were conducted to help test the validity of Waldorf's fracture theory. Results of these studies revealed that the omission of plastic-flow effects in the Waldorf equation is a serious neglect, since this flow can appreciably alter the effective stress at the crack tips under suitable conditions. This phenomenon will modify the temperature dependence of the strength of the material from that given by the theory and its a priori determined parameters. A discussion of fracture-time delay is also included. Dynamic compression data were experimentally determined for four re-entry vehicle materials: Avcoat II, Chopped Nylon Phenolic, RAD 60, and Series 124A Resin. These data have been used to formulate a Hugoniot equation of state for each material.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1964
Accession Number
AD0433240

Entities

People

  • N. A. Louie

Organizations

  • Aerojet Rocketdyne Holdings

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aluminum
  • Compression
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Equations
  • Films
  • Hugoniot Equations
  • Materials
  • Materials Laboratories
  • Measurement
  • Physical Properties
  • Plastic Flow
  • Plastics
  • Resins
  • Shock Waves

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials