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Accelerated fatigue durability of a high performance composite
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Rotem, A. |
| Copyright Year | 1982 |
| Description | The fatigue behavior of multidirectional graphite-epoxy laminates was analyzed theoretically and experimentally in an effort to establish an accelerated testing methodology. Analysis of the failure mechanism in fatigue of the laminates led to the determination of the failure mode governing fracture. The nonlinear, cyclic-dependent shear modulus was used to calculate the changing stress field in the laminate during the fatigue loading. Fatigue tests were performed at three different temperatures: 25 C, 74 C, and 114 C. The prediction of the S-N curves was made based on the artificial static strength artificial static strength at a reference temperature and the fatigue functions associated with them. The prediction of an S-N curve at other temperatures was performed using shifting factors determined for the specific failure mode. For multidirectional laminates, different S-N curves at different temperatures could be predicted using these shifting factors. Different S-N curves at different temperatures occur only when the fatigue failure mode is matrix dominated. It was found that whenever the fatigue failure mode is fiber dominated, temperature, over the range investigated, had no influence on the fatigue life. These results permit the prediction of long-time, low temperature fatigue behavior from data obtained in short time, high temperature testing, for laminates governed by a matrix failure mode. |
| File Size | 1313822 |
| Page Count | 35 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820025561 |
| Archival Resource Key | ark:/13960/t11p2xb0p |
| Language | English |
| Publisher Date | 1982-09-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Temperature Dependence Accelerated Life Tests Stress Distribution Fatigue Materials Tensile Tests Failure Modes High Temperature Tests Shear Stress Graphite-epoxy Composites Laminates Stress-strain Diagrams Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
