Effect of Variances and Manufacturing Tolerances on the Design Strength and Life of Mechanically Fastened Composite Joints. Volume 1. Methodology Development and Data Evaluation
Final rept. 15 Feb 78-15 Apr 81
MCDONNELL AIRCRAFT CO ST LOUIS MO
Pagination or Media Count:
The subject of this program was structural evaluation of mechanically fastened composite joints. Program objectives were threefold 1 development and verification by test of improved static strength methodology, 2 experimental evaluation of the effects of manufacturing anomalies on joint static strength, and 3 experimental evaluation of joint fatigue life. Program activities to accomplish these objectives were organized under five tasks. Under Task 1 - Literature Survey, a survey was performed to determine the state-of- the-art in design and analysis of bolted composite joints. Experimental evaluations of joint static strength were performed under Tasks 2 and 3. In Task 2 - Evaluation of Joint Design Variables, strength data were obtained through an experimental program to evaluate the effects of twelve joint design variables. In Task 3 - Evaluation of Manufacturing and Service Anomalies, effects of seven anomalies on joint strength were evaluated experimentally and compared with Task 2 strength data. Bolted composite joint durability was evaluated under Task 4 - Evaluation of Critical Joint Design Variables on Fatigue Life. Seven critical design variables or manufacturing anomalies were identified based on Task 2 and 3 strength data. Under Task 5 - Final Analyses and Correlation, required data reduction, methodology development and correlation and necessary documentation were performed.
- Couplers, Fasteners and Joints