Author
Char Raghunandan
Bio: Char Raghunandan is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Bellows & Hydroforming. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.
Topics: Bellows, Hydroforming
Papers
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TL;DR: In this paper, a combination of hydroforming and roll-forming processes is examined to enhance the fatigue life of steel bellows for low-pressure, low-temperature applications.
11 citations
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TL;DR: In this paper, the failure of a pressure safety valve (PSV) in a petroleum refinery was investigated and it was found that the failure had occurred due to stress corrosion cracking (SCC) caused by a high amount of chloride ions in the operating environment.
27 citations
TL;DR: In this article, the fatigue behavior of U shaped hydroformed bellows was investigated using the finite element method, and the experimental results of the fatigue test correlates well with the numerical results, indicating that the fatigue life of the bellows is very short.
14 citations
TL;DR: A finite element model was established to simulate the forming residual stress of the nickel alloy multi-layer bellow and the distribution of residual stress was calculated out and validated by cosα X-ray diffraction measurement.
5 citations
TL;DR: In this article, the authors investigated the failure of the expansion bellow during turbine operation of a boiler unit and found that the maximum stress induced in the trough region and stress could be higher as compared to ASME VIII Div 1 design equations.
5 citations
Journal Article•
TL;DR: In this paper, the performance of the hydroformed tubular bellows expansion joints made up of inconel 625 (superalloy) was evaluated by using the spring rate test and life cycle test.
Abstract: Tubular Bellows are generally formed by hydroforming process is to achieve the uniformity in structure with adequate dimensional accuracy. This research investigation focused on evaluating the performance of the hydroformed tubular bellows expansion joints made up of inconel 625 (superalloy). The optical microscopic image has been used to find the variation in thickness of bellows. The flexibility and the fatigue property of the bellows were evaluated by using the spring rate test and life cycle test. The cross-sectional SEM (Scanning Electron Microscope) images were perfectly identifying the defects which presence on the surface of the convolutions of the bellows expansion joints.
4 citations