Accession Number:

ADA048565

Title:

Stress Fields in Composite Laminates.

Descriptive Note:

Interim rept. Apr 76-Apr 77,

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• Pagano,N. J.

Report Date:

1977-08-01

Pagination or Media Count:

54.0

Abstract:

A new theory is proposed to define the complete stress field within an arbitrary composite laminate. The theory is based upon and extension of Reissners variational principle to laminated bodies. Weaknesses in previous laminate theories are discussed and it is demonstrated how these are overcome in the present formulation. Comparison with existing numerical elasticity solutions for a class of boundary value problems in which steep stress gradients are present shows extremely close agreement. Author

Descriptors:

• *STRESS ANALYSIS
• *LAMINATES
• *COMPOSITE STRUCTURES
• *MATHEMATICAL ANALYSIS
• STRESS STRAIN RELATIONS
• FINITE ELEMENT ANALYSIS
• ELASTIC PROPERTIES
• EQUILIBRIUM(GENERAL)
• STRAIN(MECHANICS)
• BOUNDARY VALUE PROBLEMS
• NUMERICAL METHODS AND PROCEDURES
• ENERGY LEVELS
• VARIATIONAL PRINCIPLES
• LAMINAR BOUNDARY LAYER
• DISTRIBUTION THEORY
• PLANE GEOMETRY

Subject Categories:

• Laminates and Composite Materials
• Statistics and Probability
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE