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Effects of cure temperature, electron radiation, and thermal cycling on p75/930 composites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Funk, Joan G. |
| Copyright Year | 1990 |
| Description | Graphite/epoxy composites are candidates for future space structures due to high stiffness and dimensional stability requirements of these structures. Typical graphite/epoxy composites are brittle and have high residual stresses which often result in microcracking during the thermal cycling typical of the space environment. Composite materials used in geosynchronous orbit applications will also be exposed to high levels of radiation. The purpose of the present study was to determine the effects of cure temperature and radiation exposure on the shear strength and thermal cycling-induced microcrack density of a high modulus, 275 F cure epoxy, P75/930. The results from the P75/930 are compared to previously reported data on P75/934 and T300/934 where 934 is a standard 350 F cure epoxy. The results of this study reveal that P75/930 is significantly degraded by total doses of electron radiation greater than 10(exp 8) rads and by thermally cycling between -250 F and 150 F. The P75/930 did not have improved microcrack resistance over the P75/934, and the 930 resin system appears to be more sensitive to electron radiation-induced degradation than the 934 resin system. |
| File Size | 585706 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910006019 |
| Archival Resource Key | ark:/13960/t12p01g65 |
| Language | English |
| Publisher Date | 1990-12-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Microcracks Radiation Effects Aerospace Environments Shear Strength Thermal Cycling Tests Electron Radiation Brittleness Radiation Dosage Degradation Temperature Effects Curing Graphite-epoxy Composites Stiffness Spacecraft Structures Geosynchronous Orbits Dimensional Stability Residual Stress Large Space Structures Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
