Project Vishnu: Long Range Hypersonic Cruise Missile (1 Viewer)

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Yea that's active cool scramjet tech
The one which was tested 1000 seconds
Due to the temperature being higher for even super alloys,they're susceptible to creep failure
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This is a graph for creep failure,in primary i.e stage 1 due to strain hardening the slope decreases with time
In secondary stage the curve is almost linear because the effect of heating and strain hardening is counterbalanced and in stage 3 heating effect dominates strain hardening due to which heating penetrates internal structure of the material therefore softening the material causing rupture.
The main problem with creep is even if you keep the load and temperature constant the strain increases which is problematic at very high temperature
 
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