Investigation of Joints in Advanced Fibrous Composites for Aircraft Structures. Joint and Attachment Investigation. Volume 2. Test Results
Final rept. 25 Apr 1967-28 Mar 1969
DOUGLAS AIRCRAFT CO LONG BEACH CA
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Engineering drawings, experimental data, and quality control data are presented in this volume for specimens that were tested in an investigation of joints and attachments in advanced fibrous composites for aircraft structures. Engineering drawings are presented showing design details and parametric variations for each specimen. Test fixture and instrumentation details are shown for a trosion ring adhesive shear test apparatus designed to measure stress- strain characteristics of adhesives in pure shear without the stress concentrations of conventional lap shear specimens. Experimental plots or test data tabulations are presented for basic laminate and adhesive properties and for static and fatigue strength tests on bonded and bolted joint specimens. Test results are summarized for six adhesives. Static test results are given for adhesive joint specimens and for single-fastener, bolted joint specimens. Test results are tabulated for selected joint concepts under constant-amplitude fatigue test conditions. Quality control specifications, incoming inspection records, and resin and void content determinations are presented. The vacuum pyrolysis method of determining the resin content of boron-epoxy laminates is described.
- Laminates and Composite Materials
- Couplers, Fasteners and Joints