Stress Concentration Around Holes in Laminated Fibrous Composites.
Abstract
The purpose of this research was to show, both experimentally and analytically, that the stress concentration around holes in laminated fibrous composites is not adequately described by the theoretical solution for homogeneous orthotropic plates, and that it is a function of hole size. It was shown that the gross laminate properties, determined analytically from individual laminate properties, make it impossible to express the proper boundary conditions at a free edge. A new expression for the modulus of elasticity tangential to a free boundary was developed. Thus, the problem became similar to that of a circular hole strengthened by an elastic ring. Furthermore, the effective width of such a ring was found to depend upon hole size. Thus, the stress concentration factor was shown to be a function of hole size, which was not predicted by homogeneous orthotropic theory. These results were very satisfactorily verified by experiment. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1975
- Accession Number
- ADA015025
Entities
People
- David Lee Saba
Organizations
- Naval Postgraduate School