Accession Number:

ADA327579

Title:

Failure Models for Textile Composites.

Descriptive Note:

Final rept.,

Corporate Author:

ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s):

• Cox, Brian

Report Date:

1995-08-01

Pagination or Media Count:

141.0

Abstract:

The goals of this investigation were to identify mechanisms of failure and determine how the architecture of reinforcing fibers in 3D woven composites controlled stiffness, strength, strain to failure, work of fracture, notch sensitivity, and fatigue life and to model composite stiffness, strength, and fatigue life. A total of 11 different angle and orthogonal interlock woven composites were examined. Composite properties depended on the weave architecture, the tow size, and the spatial distributions and strength of geometrical flaws. Simple models were developed for elastic properties, strength, and fatigue life. A more complicated stochastic model, called the Binary Model, was developed for damage tolerance and ultimate failure. These 3D woven composites possessed an extraordinary combination of strength, damage tolerance, and notch insensitivity.

Descriptors:

• *FIBERS
• *COMPOSITE MATERIALS
• *FAILURE
• *TEXTILES
• MATHEMATICAL MODELS
• SPATIAL DISTRIBUTION
• STOCHASTIC PROCESSES
• DAMAGE
• FATIGUE LIFE
• PREDICTIONS
• STIFFNESS
• ELASTIC PROPERTIES
• CARBON
• FRACTURE(MECHANICS)
• THREE DIMENSIONAL
• DEFECTS(MATERIALS)
• STRENGTH(GENERAL)
• TOLERANCE
• GEOMETRY
• EPOXY COMPOSITES
• REINFORCING MATERIALS
• WEAVING
• NOTCH SENSITIVITY

Subject Categories:

• Laminates and Composite Materials
• Textiles

Distribution Statement:

APPROVED FOR PUBLIC RELEASE