Accession Number:

ADA021242

Title:

Investigation of Failure Mechanisms in Fiber Composite Laminates.

Descriptive Note:

Final rept. Jun 74-Jun 75,

Corporate Author:

MATERIALS SCIENCES CORP BLUE BELL PA

Personal Author(s):

• McLaughlin,Philip V. , Jr
• Huang,Shiao N.
• Rosen,B. Walter

Report Date:

1975-06-01

Pagination or Media Count:

99.0

Abstract:

An analytical investigation is made into the behavior of fiber composite laminates after initial lamina failure has occurred in top outside layer. The analysis investigates the relative importance of delamination of the failed layer and of stress concentrations in the adjacent lamina to the ultimate failure mechanisms of laminates. A general interlaminar stress analysis is developed which takes into account interface nonlinear behavior and delamination effects. The analysis is specialized to a laminate whose top layer contains a long crack. Laminated plate theory is used in conjunction with the interlaminar stress analysis to analyze first and subsequent failure of graphiteepoxy 090, plus or minus 45, and 0plus or minus 45 laminates under several stress states.

Descriptors:

• *LAMINATES
• *LAMINATED PLASTICS
• STRESS ANALYSIS
• FIBER REINFORCED COMPOSITES
• CARBON FIBERS
• FAILURE(MECHANICS)
• EPOXY RESINS
• REINFORCED PLASTICS

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE