Accession Number:

ADA230470

Title:

Failure Mechanisms in a Quasi-Isotropic Ceramic Composite Laminate under Tensile Fatigue Loading

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Tracy, Gregory D.

Report Date:

1990-12-01

Pagination or Media Count:

134.0

Abstract:

A study was conducted to experimentally investigate the tensile fatigue damage mechanisms in a quasi-isotropic ceramic matrix composite Cornings NicalonCASIII. The goals of this study were to 1 develop a grip fixture for a servo-hydraulic MTS test machine and 2 conduct a series of tests with 0-4590s specimens subjected to tensile fatigue loading to study their fatigue damage growth mechanisms. Results showed that when the material was subjected to stresses below 90 MPa, it lasted over 1000000 cycles but when stressed at or above 90 MPa, it failed in less than 1000 cycles. JHD

Descriptors:

• *TEST AND EVALUATION
• GROWTH(GENERAL)
• LOADS(FORCES)
• FATIGUE(MECHANICS)
• FAILURE
• TEST EQUIPMENT
• MACHINES
• DAMAGE
• TENSILE PROPERTIES

Subject Categories:

• Containers and Packaging
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE