Nondestructive Measurement of Impact Toughness of Aircraft Windshields.

Abstract

This report summarizes the results on the project obtained over the past fifteen months. With a view toward establishing a nondestructive procedure for evaluation - of the impact properties of polycarbonate windshield material, we have set up the following experiments (1) a split-Hopkinson bar apparatus for impact strength measurement, (1) an instrumented impact tester for impact toughness measurement and (3) a monochromator with a birefringence measuring Babinet-Soleil compensator for optical characterization. Some polycarbonate specimens have been identified as potential candidates for evaluation of the proposed method. A dynamic crack growth model based on an extension of the Dugdale-Barenblatt has been formulated and solved through a finite difference scheme. This model exhibits many of the features observed in dynamic fracture experiments. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Dec 15, 1995
Accession Number
ADA303565

Entities

People

  • K. Ravi-chandar

Organizations

  • University of Houston

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Birefringence
  • Crack Tips
  • Equations
  • Geometry
  • Impact Strength
  • Light Sources
  • Materials
  • Measurement
  • Mechanical Engineering
  • Mechanical Working
  • Mechanics
  • Molecular Weight
  • Optical Properties
  • Strain Gages
  • Stress Waves
  • Test And Evaluation
  • Toughness

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.