Effect of surface coating on cylinders subjected to underwater shock
Bergersen, John K.
Kwon, Young W.
Shin, Young S.
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The response of a composite cylinder (metallic cylinder coated with a rubber material) subjected to an underwater explosion was analyzed numerically. Qualitative differences between coated and uncoated cylinders were investigated. The dynamic response of the coated cylinder was found to be adversely affected when impacted by an underwater shock wave under certain conditions of geometry and material properties of the coating. When adversely affected, significant deviations in axial and hoop stress and strain values were observed. The coated cylinder exhibited larger effective plastic strain and higher residual internal energy in thp metallic material. Rubber coatings appeared to inhibit energy dissipation from the metallic material to the surrounding water medium. A parametric study of various coatings was performed on both aluminum and steel cylinders. The adverse effects of the coating decreased when the shear modulus of the rubber was increased or when the rubber thickness was increased, indicating the existence of threshold values for these parameters. The results of this study indicate that the stiffness of the coating is a critical factor involving these threshold values.
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Kwon, Y.W.; Bergersen, J.K.; Shin, Y.S. (John Wiley & Sons, Inc., 1994);The response of a coated cylinder (metallic cylinder coated with a rubber material) subjected to an underwater explosion is analyzed numerically. The dynamic response of the coated cylinder appears to be adversely affected ...
Kwon, Young W.; Shin, Y. S.; Brasek, Thomas Peyton (Monterey, California. Naval Postgraduate School, 1994); NPS-ME-94-006The response of a one-dimensional, coated, aluminum structure subjected to a unit step pressure wave is studied. The coating is either an elastic material or a viscoelastic tread stock rubber of variable stiffness; it ...
Brasek, Thomas Peyton; Kwon, Young W.; Shin, Y. S. (Monterey, California. Naval Postgraduate School, 1994); NPS-ME-94-007The response of coated, metallic structures subjected to shock pressure waves is studied. The coating is either an elastic material or nearly incompressible rubber of variable stiffness separating the structure from an air ...