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Abstract:
The goal is to provide the material property information that is needed to decide whether radial bundles can reduce the stress in the circumferential bundles during the thermal processing of billets. Testing consisted of bundle pull-out experiments at room, 1000C, and 1500 C on coupons excised from as billet and of rupture and creep experiments on bundles processed to different degrees. The pull-out specimens showed increasing shear strength with temperature and the data showed a decrease in the coefficient of variation with temperature. The average bundle-matrix bond strength at 1500 C had a value of 1940 ksi with a coefficient of variation of 4.9%. The tests at 1000 C and room temperature had a coefficient of variation of 7.9% and 19.2 % respectively. The tensile strengths of the bundles were relatively insensitive to processing and varied from 190 to 260 ksi. No creep was observed at the maximum available temperature of 1800 C. Additional keywords: Rocket nozzles; Graphite; Fabrication; Stresses; Shear lag; High temperature. (Author)
| Description: |
Technical rept. |
| Pages: |
84 |
| Report Date: |
01 JUL 85 |
| Contract Number: |
N00014-77-C-0505 |
| Report Number: |
A936651 |
Report Unavailable |
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