Dynamic response of a laminated pipeline on the seabed subjected to underwater shock

Transient vibrations of laminated composite cylindrical shells exposed to underwater shock waves

“…A fluid-structure interaction takes place as the pressure pulses act upon the flexible surface of the structure. The equation of motion for the velocity u(t) of the structural surface in the direction that is opposite to the normal to the surface is [19] m su (t) = p tot (t) − p str (t) (14) where m s is the mass of the structural surface per unit area, p tot (t) is the total pressure in the fluid, and p str (t) is the structural pressure, which is determined by the properties of the structure. Rigid body and elastic motions of the structure will be initiated by the incident shock wave, which will be scattered by the structure as an obstacle, and the motions of the structure will again radiate waves into the fluid medium.…”

“…(14) can be expressed as [19,20] u(t) = u 0 (t) − u str (t) (22) in which the velocity, if there were no structural pressure, is and the retarding velocity due to the structural pressure is…”

“…The effective structural damping and stiffness were formulated and incorporated in the fluid-structure-coupled equations. Lam et al [14] studied the dynamic response of a simply supported laminated pipeline lying on the seabed subjected to underwater explosion shock, using the modal analysis technique. The pipeline was modeled as the laminated moderately thick cylindrical shell and an approximate method was introduced to estimate the explosion shock loading.…”

Performance Quality Testing under Combined Loading of Polyethylene Pipes Reinforced with Aramid Fiber

“…Many studies related to thermoset composite pipes [2][3][4][5][6] have been published considering combined loads, as well as thermoplastic pipes [7]. However, there are few works relaying on RTP under combined load testing; in two of them, Kruijer et al [8] investigated polyethylene pipes reinforced with embedded aramid fibers so as to identify its torsion-extension coupling, and the viscoelastic behavior of steel reinforced thermoplastic (polyethylene) pipe or s-RTP.…”

Dynamic Responses of Composite Structures with Fluid-Structure Interaction

“…Both experimental and numerical studies have been conducted for metallic structures [Kwon & Fox, 1993;Kwon, et al, 1994;Kwon & McDermott, 2001]. On the other hand, a much limited studies were undertaken for composite structures subjected to underwater explosion [Rasmussen, 1992;Rousseau, 1993;Mouritz, 1995Mouritz, , 1996McCoy & Sun, 1997;Gong & Lam, 1998;and Lam, et al, 2003]. As far as impact loading on composite structures under water is concerned, the author's research team conducted the research for the first time, to our best knowledge [Kwon, 2009;Kwon & Kendall, 2009;Owen, et al, 2010].…”