GLTRS--Glenn
TITLE AND SUBTITLE:
Computational Simulation of Composite Structural Fatigue

AUTHOR(S):
Levon Minnetyan

REPORT DATE:
February 2005

FUNDING NUMBERS:
WBS-22-066-30-02
NAG3-2609

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
Clarkson University
1 Clarkson Avenue
Potsdam, New York 13699-5710

PERFORMING ORGANIZATION REPORT NUMBER:
E-15018

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Final Contractor Report

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA CR-2005-213573

SUPPLEMENTARY NOTES:
Project Manager, Christos C. Chamis, Research and Technology Directorate, NASA Glenn Research Center, organization code R, 216-433-3252.

ABSTRACT:
Progressive damage and fracture of composite structures subjected to monotonically increasing static, tension-tension cyclic, pressurization, and flexural cyclic loading are evaluated via computational simulation. Constituent material properties, stress and strain limits are scaled up to the structure level to evaluate the overall damage and fracture propagation for composites. Damage initiation, growth, accumulation, and propagation to fracture due to monotonically increasing static and cyclic loads are included in the simulations. Results show the number of cycles to failure at different temperatures and the damage progression sequence during different degradation stages. A procedure is outlined for use of computational simulation data in the assessment of damage tolerance, determination of sensitive parameters affecting fracture, and interpretation of results with insight for design decisions.

SUBJECT TERMS:
Cyclic loading; Progressive degradation; Thermal effect; Fatigue; Laminates

NUMBER OF PAGES:
21

PDF AVAILABLE FROM URL:
2005/CR-2005-213573.pdf ( 280 KB )
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