Accession Number:

ADA063796

Title:

Representation of Matrix/Interface-Controlled Strength of Unidirectional Composites.

Descriptive Note:

Final rept. 1 May 76-31 Dec 77,

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• Hahn,H. Thomas
• Erikson,J.

Report Date:

1978-08-01

Pagination or Media Count:

38.0

Abstract:

The report presents a method of characterizing the matrixinterface-controlled strength, including scatter, of unidirectional composites under combined loading. The failure envelope is represented by a second order polynomial and the scatter is described by the strength vector whose magnitude has a Weibull distriubtion. The method is based on the assumption of failure originating at inherent cracks parallel to the fibers and holds promise as a means of accounting for the size effect under combined loading. In addition, the energy release rate approach is discussed as a physical model and the appropriate data are presented. Author

Descriptors:

• *FIBER REINFORCED COMPOSITES
• *MATRIX MATERIALS
• *STRENGTH(MECHANICS)
• *MATHEMATICAL ANALYSIS
• WEIBULL DENSITY FUNCTIONS
• INTERFACES
• LOADS(FORCES)
• CRACKING(FRACTURING)
• TOUGHNESS
• POLYNOMIALS
• FAILURE(MECHANICS)

Subject Categories:

• Laminates and Composite Materials
• Statistics and Probability
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE