Quote:
Originally Posted by M3SQRD
I work on spacecraft composite structures for a living. So far I’ve only been able to find velocity stack and CF-to-aluminum ring (secures the velocity stack to the ITB) bonded joint failures on the Eventuri CF plenum design. It’s not surprising that the Eventuri velocity stacks have separated from the plenum due to its poorly designed bonded joint that’s subjected to primary adhesive peel loading (weakest load path for an adhesively bonded joint). Using a large blob of adhesive to create a generous radius adds zero peel strength. The metallic ring that secures to the ITB is a single lap shear joint with practically zero bond area. The CF plenum is subjected to structure-borne random vibration from the engine rpm, thermally-induced loads due to CTE mismatch as well as secondary inertial and acoustic loadings. I doubt they performed any type of dynamic analysis to predict loads and then used the predicted loads in structural analyses to show their design can withstand its structural loading environments.
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You work in composites so you know a lot more than I do, that's out of my depth, I only report what I read! I guess doing all those tests takes a lot of time and money, so maybe that wasn't done, who knows. Yes, so far the problems only seem to be with the original Eventuri design. I have their updated plenum which bolts the throttle adapters to the velocity stacks with special vibration resistant lock nuts to avoid this problem. I think they learned from their mistake and did a thorough update. Hoping it holds up over time.