Among the many deepwater activities in which deep-diving submarines have been used, include marine research, deep ocean mining and submarine rescues. To resist high hydrostatic pressure and obtain more inner space, the deep-diving submersible pressure hull is normally constructed by high strength steel and a simple geometrical configuration, e.g. spherical, elliptical and cylindrical shells. The material properties, weight/volume ratio and aspect ratio profoundly influence the diving depth of pressure hulls. The accurate calculation of strength is of priority in developing deep-diving submarine. It was investigated the diving depth of spherical and elliptical shells. Also considered are the geometrical non-linear and elastoplastic material of high yield steels, as well as effect of weight/volume ratios and aspect ratios on the geometrical configuration. High yield steels, i.e. HY80, HY100 and HY140, are adopted here. In addition, the finite element procedure based on the Hibbit and Karlsson's methodology is used to analyze the diving depth of the shells. Experimental results indicate that for a spherical shell a/b=1 and the weight/volume ratio W/V=0.685 ton/m3, the HY140 steel has the greatest yielding diving depth, i.e. 5238.6 m and ultimate diving depth, i.e. 5957.9 m. Moreover, the difference between diving depth at yielding strength and diving depth at ultimate strength is 719.3 m, i.e. lower than the difference 1020.2 m for HY80 and 840.6 m for HY100. Although the pressure hull of HY140 steel has a deeper diving depth than the HY80 and HY100, the difference between yielding and ultimate diving depth is smaller than the others, because the ability to sustain plastic deformation of HY140 is lower than that of HY100 and HY80. According to our results, a deep diving submersible pressure hull having a larger aspect ratio, has a larger diving depth. In addition, the higher weight/volume ratio implies a larger diving depth. Moreover, the higher yielding/ultimate strength implies a deep diving depth.


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    Title :

    A study of diving depth on deep-diving submersible vehicle


    Additional title:

    Untersuchung der Tauchtiefe von tieftauchenden Unterwasserfahrzeugen


    Contributors:
    Liang, C.C. (author) / Teng, T.L. (author) / Lai, W.H. (author)


    Publication date :

    1998


    Size :

    11 Seiten, 13 Bilder, 10 Tabellen, 16 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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