Impact Response Characteristics of Polymeric Matrices

Abstract

Impact/indentation velocity measurements on polycarbonate (PC) and polymethylmethacrylate (PMMA) have been measured to 6000 inches/minute using a 4.5 mm diameter ball as the impacting object. The 'best' force versus penetration depth values are given covering the range .0002 inches/minute to the maximum. Load relaxation measurements are reported and are found to have a characteristic time-decay constant inversely proportional to the impact velocity. This anomalous result causes a sensitive time dependence to be obscured under ordinary conditions. The deformation zone is found to consist of densified material and appears to result from an anelastic yielding. Models, analyses, and interpretations of the results are developed. The phenomena are believed to be fairly broadly applicable to other polymers.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1975
Accession Number
ADA015131

Entities

People

  • William B. Hillig

Organizations

  • General Electric

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Complex Systems
  • Diameters
  • Elastic Materials
  • Equations
  • Glass Transition Temperature
  • Hardening
  • Hardness
  • Materials
  • Measurement
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Deformation
  • Relaxation Time
  • Resins
  • Time Dependence
  • Transition Temperature

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Explosive Engineering.
  • Polymer Science and Engineering.