Stress analysis of the LHA-1 class superheater header by finite element method.
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Author
Kaufmann, Jon W.
Date
1987-06Advisor
Cantin, G.
Second Reader
Wilson, E.L.
Metadata
Show full item recordAbstract
Numerous cracks and leaks in the superheater header tube attachment welds in
the LHA-1 class of amphibious assault ships have prompted an investigation by the
Naval Sea Systems Command (NAVSEA). This thesis describes the stress analysis of
the superheater header tube attachment region using a three dimensional axisymmetric
Finite Element model. The SAP 80 structural analysis program was utilized to conduct
the analysis. Both pre and post processors were employed to obtain graphical
representations of the model as well as the results of the stress analysis. This thesis
focuses primarily on thermally induced stresses produced in the header. Some results
obtained for a nominal 100 Degree F temperature drop across the thickness of the
superheater header wall yielded a maximum hoop stress of 19.01 (Ksi) and a maximum
in plane stress of 1.58 (Ksi).
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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