Accession Number:

ADA303565

Title:

Nondestructive Measurement of Impact Toughness of Aircraft Windshields.

Descriptive Note:

Final rept. 15 Jul 94-15 Oct 95,

Corporate Author:

HOUSTON UNIV TX DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1995-12-15

Pagination or Media Count:

38.0

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

Subject Categories:

  • Aircraft
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE