Accession Number:

ADA343003

Title:

Towards a Predictive Design Methodology of Composite Laminates and Patches: Physical Models of Environmental and Thermal Sensitive Failure Processes

Descriptive Note:

Corporate Author:

CAMBRIDGE UNIV (UNITED KINGDOM) DEPT OF ENGINEERING

Personal Author(s):

• Beaumont, Peter W.

Report Date:

1998-04-01

Pagination or Media Count:

45.0

Abstract:

Once damage initiates, the stress distribution at the notch tip is altered by the growth of splits and delaminations and ultimate failure is controlled by the maximum notch tip stress in the load-bearing 0 degree plies, sigma0p. A damage-based model for notched tensile strength has been assembled, using the results of both finite element analysis and Weibull experiments. Thermal residual stresses are included into the model. Additional energy contributions are suggested that may arise due to interlaminar effects not included in the 2-dimensional finite element model.

Descriptors:

• *CRACK PROPAGATION
• *EPOXY LAMINATES
• *NOTCH SENSITIVITY
• WEIBULL DENSITY FUNCTIONS
• PREVENTIVE MAINTENANCE
• FINITE ELEMENT ANALYSIS
• GLASS FIBERS
• THERMAL STRESSES
• FATIGUE TESTS(MECHANICS)
• UNITED KINGDOM

Subject Categories:

• Laminates and Composite Materials
• Test Facilities, Equipment and Methods
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE