Experimental and Numerical Studies on Inelastic Dynamic Behaviour of Stainless Steel Elbow under Harmonic Base excitation

[+] Author and Article Information
A. Ravi Kiran

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India

G. R. Reddy

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India

M.K. Agrawal

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India

1Corresponding author.

ASME doi:10.1115/1.4039126 History: Received October 24, 2017; Revised January 13, 2018


In the present work, inelastic dynamic behavior of a pressurized stainless steel elbow is studied under harmonic base excitation with emphasis on strain accumulation known as ratcheting. Initially, sine sweep test is carried out on the long radius stainless steel (SS 304L) elbow to evaluate the free vibration characteristics. Then incremental harmonic base excitation with first resonant frequency is applied to the elbow till failure and the resulting response is studied. The tested elbow is analyzed using a simplified method and the simulated ratcheting strain is compared with experimental results. Effect of thickness variation in the elbow on strain accumulation is also studied. Levels of base excitation corresponding to different failure criteria are evaluated and the details are provided in the paper.

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