Impact Damage Thresholds in Brittle Materials Impacted by Water Drops.

Abstract

The damage threshold for brittle materials impacted by water drops has been studied by using a combination of analytic and numerical approaches to obtain solutions for the impact stress fields and dynamic stress intensity factors. It has been shown that expressions for the damage threshold, which consists of the activation of pre-existent surface microcracks, can be derived from these solutions. The expressions identify three types of behavior, depending upon the adjacence of the pre-existent cracks to the impact center, vis-a-vis their size, and describe the respective roles of the three important target parameters, the fracture toughness, the elastic wave velocity and the pre-existent flow size. An absolute damage threshold has also been defined. The conditions at this threshold are demonstrated to be reasonably consistent with available threshold measurements. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1979
Accession Number
ADA068440

Entities

People

  • A. G. Evans
  • M. Rosenblatt
  • Y. M. Ito

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Analytic Functions
  • Crack Tips
  • Cracks
  • Differential Equations
  • Elastic Waves
  • Intensity
  • Materials
  • Partial Differential Equations
  • Peak Values
  • Physical Properties
  • Rayleigh Waves
  • Stress Intensity Factors
  • Stress Waves
  • Stresses
  • Tensile Stress
  • Time Dependence
  • Waves

Readers

  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.