The Influence of Ply Waviness with Nonlinear Shear on the Stiffness and Strength Reduction of Composite Laminates
Abstract
The influence of ply waviness with nonlinear shear material response on the mechanical performance of composite laminates is studied. An analytic model, based on a three-dimensional laminated media analysis, is developed to predict the effective nonlinear laminate behavior associated with ply waviness. An undulating 0 ply in a (90/0/90) sublaminate configuration and an undulating (+ or - Beta) ply in a (90/+ or - Beta/90) sublaminate configuration are two types of ply waviness considered. An incremental loading strategy is employed wherein piecewise linear solutions are supposed to obtain the overall nonlinear stress/strain response of composite laminates with wavy plies. The analysis also predicts individual ply stress and strain distributions with the wavy ply configuration. The maximum stress failure criteria is used to predict ply failure in local regions with the wavy ply configuration, and a progressive failure methodology is adopted to permit local load redistribution. Results are presented which offer fundamental insight into the dominant mechanisms for stiffness and strength reduction in composite laminates exhibiting ply waviness and nonlinear shear material behavior. Composite materials, Ply waviness, Nonlinear shear, Stiffness, Strength.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1994
- Accession Number
- ADA285736
Entities
People
- John W. Gillespie Jr.
- Mark A. Lamontia
- Travis A. Bogetti
Organizations
- United States Army Research Laboratory