This is the second of five murals to be posted. Visit us again!
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| Space Shuttle
Main Engine O'Donnell developed an analytical procedure for predicting thrust chamber life limited by the small number of firings. In an operating rocket thrust chamber the hot-gas-wall ligaments separating the coolant and combustion gas are subjected to pressure loading and severe thermal cycling. The resulting stresses cause plastic straining resulting in incremental bulging of the ligaments during each firing cycle. This mechanism of creep ratcheting was analyzed considering combined bending and membrane loading. The incremental permanent deflection and progressive thinning near the center of the ligaments was evaluated. Creep and tensile instability were identified as the limiting mode of failure. Results of these analyses compared favorably with available experimental data and allowed design changes which extended the design life. |
| Hubble
Space Telescope O'Donnell Consulting Engineers evaluated the nature of vibratory conditions in the framework supporting the Hubble Space Telescope. Combined analyses and tests showed that conditions were due to second order shortening of the transverse bracing members not found by conventional computer analysis. The vibration problems were then solved using lateral restraints on the transverse members. |
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| Heat Exchanger O'Donnell Consulting performed an extensive engineering analyses of a high-temperature heat exchanger for NASA. The results showed that the cracks were caused by excessive cyclic thermal stresses, and a repair redesign was developed. |
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