Warnick James Module6 Questions with Answers -Student.docx

Warnick James Module6 Questions with Answers -Student.docx...

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SFTY 335 - Module 6 1. What are the design changes that can be done to limit creep failure and what would be practical if limiting creep on gas turbine engines? (up to 15 points) It is possible to limit or prevent creep if you utilize materials that have higher melting points than what they will be exposed to. If you were to replace material made from steel or aluminum and replaced them with a tungsten or ceramic type material would provide the reduction in operating temperatures needed. If you were to increase the grain size of the material, and alloying would also aid the reduction of creep. Within an engine it is not practical to reduce operating temperatures however if you were to utilize higher temperature materials and forging components with larger grains it would reduce the creep as well. 2. How does the rate of change of creep differ in each of the classic three stages? (up to 15 points) Primary creep, the strain rate is relatively high but slows over time to work hardening and typically lasts the longest.
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