A Study of the Stress-Strain Behavior of Graphite Fiber Composites to Assess the Stress Levels at Which Significant Damage Occurs.
Abstract
The purpose of this investigation is to attempt to obtain by experimental means a rigorous definition of the stress level within a composite specimen at which physical damage and/or degradation of mechanical properties is initiated and to show that the composite material resistance to subsequent loadings is seriously impaired. Load-introduction problems and compression test methods on tubes of HTS/ERL 2256 GRAPHITE EPOXY WITH (0)C, (0/90)C, (90/ + or -45/0)C, (90/+ or -45/0)C, and (+ or - 45)C orientations are studied. Additional fatigue data are generated, showing good correlation with significant damage (proportional limit) stress levels. Maximum strain criterion is used to predict the proportional limit (significant damage level) and ultimate strength with considerable success. A large number of tubes is fabricated for testing in the balance of the program and a test plan worked out. (Author, modified-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1974
- Accession Number
- ADA007069
Entities
People
- George E. Commerford
- George K. Wolfe
- Glenn C. Grimes
- Philip H. Francis
Organizations
- Southwest Research Institute