Accession Number : ADA138091

Title :   A Survey of Macroscopic Failure Criteria for Composite Materials.

Descriptive Note : Journal publication,

Corporate Author : AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s) : Tsai,S W

PDF Url : ADA138091

Report Date : Nov 1983

Pagination or Media Count : 32

Abstract : Popular failure criteria of fiber-reinforced composite materials are described and compared. These criteria are empirical and should only be judged from the standpoint of the fitness to data and the ease of application. The criteria for orthotropic plies of unidirectional composites are extensions of those for isotropic materials. The quadratic criteria are considered to be the most suitable for both isotropic and composite materials. Macroscopic criteria are essential for design and for providing guidelines for materials improvements. Strictly speaking, failure criteria for multidirectional laminants are valid up to the first-ply failure envelope; i.e., before transverse cracking and delamination occur. Finally, conditions for fully optimized ply properties are easily derived from the quadratic failure criterion. (Author)

Descriptors :   *Composite materials, *Fiber reinforced composites, *Failure(Mechanics), *Cracks, *Cracking(Fracturing), *Mathematical analysis, Quadratic equations, Transverse, Unidirectional, Isotropism, Stress strain relations, Tensile strength, Compressive properties, Poisson ratio, Shear strength, Formulas(Mathematics)

Subject Categories : Laminates and Composite Materials
      Theoretical Mathematics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE