Loading...
Please wait, while we are loading the content...
Similar Documents
The dependence of the change in the coefficient of thermal expansion of graphite fiber reinforced polyimide im7-k3b on microcracking due to thermal cycling
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Stewart, Melissa C. |
| Copyright Year | 1995 |
| Description | Composite IM7-K3B was subjected to a simulated high speed aircraft thermal environment to determine the effects of microcracking on the change in CTE. IM7-K3B is a graphite fiber reinforced polyimide laminate, manufactured by Dupont. The lay-up for the material was (0.90((Sub 3)(Sub s))). The specimens were placed in a laser-interferometric dilatometer to obtain thermal expansion measurements and were then repeatedly cycled between -65 F and 350 F up to 1000 cycles. After cycling they were scanned for microcracks at a magnification of 400x. The material was expected not to crack and to have a near zero CTE. Some microcracking did occur in all specimens and extensive microcracking occurred in one specimen. Further testing is required to determine how closely the CTE and microcracking are related. |
| File Size | 214891 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970003117 |
| Archival Resource Key | ark:/13960/t9f52m03p |
| Language | English |
| Publisher Date | 1995-01-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Microcracks Thermal Expansion Thermal Environments Lasers High Speed Graphite Polyimides Fiber Composites Thermal Cycling Tests Extensometers Size Determination Interferometry Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
