Study On Dynamic Response And Damage Mechanism Of SPS Structure For Ship

Sandwich plate attracts naval architectures field attention because excellent mechanical properties and are widely used in the naval architecture, ocean engineering and aerospace field because of advantageous features such as lightweight, simple structure, antifatigue, corrosion proof, strong shock resistance ability, high space utilization, good energy absorbing, noise-isolation, vibration absorber and filtering etc. As research SPS sandwich structures continues, a lot of applications in shipbuilding of SPS sandwich structure will be an unstoppable trend.In this dissertation, we mainly focus on the research of marine SPS, two mathematical models of marine SPS sandwich structures are provided according to the mechanical characteristics, the inside stress field and displacement field of marine SPS sandwich structure, we verify the mathematical models by a plenty of classical theories and finite element theory results. The free vibration, static mechanical behavior and dynamic response are studied based on two aforementioned models. Furthermore, the dynamic, static constitutive equations, skin/core debonds dynamic response and impact dynamic performances of different sandwich plates were studied. Key research contents and relevant conclusions in this paper are as follows:(1) The governing equations of without the dynamic effect and with the dynamic effect of core derived from equilibrium differential equations of motions are analytically solved for simply supported sandwich plate with a flexible core. The accuracy and convergence of the present theory and solution are ascertained by compared with various available results. the author considered the influence of vary of length width ratios, Young’s modulus ratios between skins and core, thickness ratios between skins and core and span-to-thickness of sandwich plates on free vibration, sinusoidal load, uniformly load and point load.(2) Constitutive equations of face steel, polyurethane and steel/polyurethane sandwich plate with high-strain rate are presented based on theories and experiments. Meanwhile, the accuracy of constitutive equations was verified by experiment results.(3) The author setting an initial debonded region for SPS structures based on stress characteristic and damage types of SPS structures which free vibration, static mechanical behavior and dynamic response are studied. Dynamic response of intact sandwich plates and debonded sandwich plates are analyzed. In order to process ls-dyna data conveniently, a 3D data processing software Figure3 D are developed based on M language.(4)Furthermore, conventional steel plane, SPS structures and SPS plate with stiffeners under low-velocity impact are analyzed, the analysis results shown that the SPS structures with stiffeners have better mechanics characteristics.