A Study of Pull-Through Failures of Mechanically Fastened Joints.
Abstract
The relationship between the bending moment and the through-plane shear force in the vicinity of a mechanical fastener at failure was determined. Experiments were conducted on 4-inch wide flat plate aluminum and graphite-epoxy composite specimens that modeled portions of a wing skin along a spar and along a rib. The composite specimens were either 8-ply or 16-ply balanced layups and were simply supported at two opposing edges and free along the other two edges. The fasteners were pulled normal to the plates, and the maximum force at failure was measured for specimen lengths varying from two to six inches between supports. Two analyses were made; one for small elastic deflections of a thin orthotropic plate, and another for a beam in the elastic range. A mesh generator for a finite element model of the plate around the fastener was also developed for the computer program ADINA.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1977
- Accession Number
- ADA047142
Entities
People
- Robert N. Freedman
Organizations
- Naval Postgraduate School