Fractographic Analysis of CVD (Chemically Vapor Deposited) ZnS (Zinc Sulfide)

Abstract

Chemically vapor deposited (CVD) zinc sulfide is used as an infrared transmitting window on heat-seeking missiles and laser systems. In many of these in-service environments, mechanical and thermal stresses can lead to crack growth and fracture. Thus, a knowledge of the mechanical and thermal properties of these materials is necessary. Although many investigations and research papers have concentrated on the processing and properties of ZnS material, very little has been written on the characterization of the fracture surface of ZnS. This report is written to demonstrate the techniques of determining the fracture origin and the surrounding topography. The fracture toughness, or resistance to crack propagation, is determined from fracture surface features. Their values compare well with reported values. More importantly, observation of the fracture surface provides a tool by which we can determine the state of stress, identify the fracture origin, and analyze the fracture process.

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Document Details

Document Type
Technical Report
Publication Date
Jul 11, 1988
Accession Number
ADA197394

Entities

People

  • J. J. Mecholsky
  • P. L. Yoder

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Chemical Compounds
  • Chemistry
  • Classification
  • Compound Semiconductors
  • Cracks
  • Engineered Materials
  • Engineering
  • Fractography
  • Fracture (Mechanics)
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanics
  • Stress Intensity Factors
  • Thermal Properties
  • Thermal Stresses

Readers

  • Materials Science (Mechanical Engineering).
  • Thin Film Deposition Science.

Technology Areas

  • Directed Energy