Cycle scaling for submarines models

I

issac82

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this is my first post.hope to get valuable help from the members.thanx in advance.

1. static and cyclic pressure testing of model is carried out before actual design for underwater vessels. How cycle scale is carried out for loading cycles. Actual structure might experience many thousands of pressure cycles.

2. When we carry out fatigue testing for the model inside a tank, the tank is itself subjected to fatigue loading, how fatigue damange to the testing tank is prevented.
 
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