船用SPS结构抗冲击性能与破坏机理研究
发布时间：2018-10-04 20:04
【摘要】：夹层结构以其优异的力学性能引起了造船界的关注,其在船舶与海洋工程及航空航天等领域的应用范围逐渐扩大,与船舶常用的带有扶强材的单一金属板相比具有重量轻、抗疲劳、结构形式简单、良好的吸能、抗腐蚀及抗冲击能力强、空间利用率高、隔振降噪及滤波等优点,随着对SPS夹层结构研究的深入,SPS夹层板大量应用于船舶制造将是一种不可阻挡的趋势。本文以船用SPS为研究对象,通过对船用SPS结构的受力特点及内部应力场和位移场进行分析,在合理假设的基础上建立了两种求解SPS夹层板的数学模型,运用大量的经典理论和有限元计算结果对两种理论进行了验证并运用以上数学模型重点研究了船用SPS结构的自由振动、静态力学行为和动态响应问题。此外对SPS夹层板的动静态本构方程、面/芯脱层问题以及不同SPS夹层板的冲击动力学性能进行了一定程度的研究。本文重点研究的内容和相关结论如下:(1)运用板的平衡运动微分方程推导了忽略芯材质量惯性的夹层板的控制方程和含芯材质量惯性的夹层板的控制方程,运用权威的数值实例和经典理论及有限元软件对两种模型的准确度和精度进行了验证,在此基础上对不同面板和芯材厚度的自由振动以及在正弦载荷、均布载荷、集中力载荷等的位移场进行了分析。在保证理论模型准确的情况下对受脉冲载荷、谐振载荷以及多次连续加载的有阻尼效应和无阻尼效应的船用SPS夹层结构的动态响应进行了分析,探讨了质量惯性力和阻尼力对SPS夹层结构的影响。(2)在理论分析的基础上通过实验研究了高应变率下面板钢、芯材以及钢/聚氨酯夹层板的准静态和高应变率动态本构关系,得到了能够准确描述芯材聚氨酯弹性体和钢/聚氨酯夹层板高应变率下的本构方程并通过实验证明了其精度。(3)由于夹层板较易发生脱层,根据夹层板的受力特点以及破坏形式,通过给船用SPS结构设定一个初始脱层,研究船用SPS夹层结构在脱层损伤下结构的自由振动和动态响应。对比分析了完好夹层板和有脱层夹层板的动态响应。为了方便处理LS-DYNA输出数据,作者运用M语言开发了一个数据处理并直观显示为三维图的软件Figure3D。(4)最后运用LS-DYNA软件详细研究了传统加筋板、SPS结构及SPS加筋板在低速冲击下的动态响应,对比分析了传统加筋板、SPS结构和SPS加筋板的自由振动和冲击动态响应。
[Abstract]:The sandwich structure has attracted the attention of shipbuilding because of its excellent mechanical properties. Its application in marine engineering, aerospace and other fields has been gradually expanded, and it has a light weight compared with the single metal plate with supporting material, which is commonly used in ships. Fatigue resistance, simple structure, good energy absorption, strong corrosion and impact resistance, high space utilization, vibration isolation, noise reduction and filtering, etc. It will be an unstoppable trend for SPS sandwich plates to be widely used in shipbuilding with the further study of SPS sandwich structures. In this paper, taking marine SPS as the research object, by analyzing the mechanical characteristics, internal stress field and displacement field of marine SPS structure, two mathematical models for solving SPS sandwich plate are established on the basis of reasonable assumptions. A large number of classical theories and finite element calculation results are used to verify the two theories and the above mathematical models are used to study the free vibration static mechanical behavior and dynamic response of marine SPS structures. In addition, the static and static constitutive equations of SPS sandwich plates, the surface / core delamination problem and the impact dynamics of different SPS sandwich plates are studied to some extent. The main contents and relevant conclusions of this paper are as follows: (1) the governing equations of the sandwich plate which neglects the inertia of the core mass and the sandwich plate with the inertia of the core mass are derived by using the equilibrium motion differential equation of the plate. The accuracy and accuracy of the two models are verified by using authoritative numerical examples, classical theory and finite element software. On this basis, the free vibration of different face panels and core materials and the distribution of loads under sinusoidal load are uniformly distributed. The displacement field of concentrated load is analyzed. The dynamic responses of marine SPS sandwich structures subjected to pulse load, resonant load and multiple continuous loading with and without damping effect are analyzed under the condition of ensuring the accuracy of the theoretical model. The influence of mass inertia force and damping force on SPS sandwich structure is discussed. (2) based on the theoretical analysis, the quasi-static and high strain rate dynamic constitutive relations of panel steel, core material and steel / polyurethane sandwich plate at high strain rate are studied experimentally. The constitutive equations which can accurately describe the core polyurethane elastomer and steel / polyurethane sandwich plate at high strain rate are obtained and their accuracy is proved by experiments. (3) due to the easy delamination of sandwich plate, according to the mechanical characteristics and failure form of sandwich plate, By setting an initial delamination for marine SPS structure, the free vibration and dynamic response of marine SPS sandwich structure under delamination damage are studied. The dynamic responses of intact sandwich plate and delaminated sandwich plate are compared and analyzed. To facilitate processing of LS-DYNA output data, In this paper, a software Figure3D. (4) is developed by using M language to process data and display 3D graph directly. Finally, the dynamic response of SPS stiffened plate under low speed impact is studied in detail by using LS-DYNA software. The free vibration and shock dynamic responses of the traditional stiffened SPS structure and the SPS stiffened plate are compared and analyzed.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U661.43
本文编号：2251697
[Abstract]:The sandwich structure has attracted the attention of shipbuilding because of its excellent mechanical properties. Its application in marine engineering, aerospace and other fields has been gradually expanded, and it has a light weight compared with the single metal plate with supporting material, which is commonly used in ships. Fatigue resistance, simple structure, good energy absorption, strong corrosion and impact resistance, high space utilization, vibration isolation, noise reduction and filtering, etc. It will be an unstoppable trend for SPS sandwich plates to be widely used in shipbuilding with the further study of SPS sandwich structures. In this paper, taking marine SPS as the research object, by analyzing the mechanical characteristics, internal stress field and displacement field of marine SPS structure, two mathematical models for solving SPS sandwich plate are established on the basis of reasonable assumptions. A large number of classical theories and finite element calculation results are used to verify the two theories and the above mathematical models are used to study the free vibration static mechanical behavior and dynamic response of marine SPS structures. In addition, the static and static constitutive equations of SPS sandwich plates, the surface / core delamination problem and the impact dynamics of different SPS sandwich plates are studied to some extent. The main contents and relevant conclusions of this paper are as follows: (1) the governing equations of the sandwich plate which neglects the inertia of the core mass and the sandwich plate with the inertia of the core mass are derived by using the equilibrium motion differential equation of the plate. The accuracy and accuracy of the two models are verified by using authoritative numerical examples, classical theory and finite element software. On this basis, the free vibration of different face panels and core materials and the distribution of loads under sinusoidal load are uniformly distributed. The displacement field of concentrated load is analyzed. The dynamic responses of marine SPS sandwich structures subjected to pulse load, resonant load and multiple continuous loading with and without damping effect are analyzed under the condition of ensuring the accuracy of the theoretical model. The influence of mass inertia force and damping force on SPS sandwich structure is discussed. (2) based on the theoretical analysis, the quasi-static and high strain rate dynamic constitutive relations of panel steel, core material and steel / polyurethane sandwich plate at high strain rate are studied experimentally. The constitutive equations which can accurately describe the core polyurethane elastomer and steel / polyurethane sandwich plate at high strain rate are obtained and their accuracy is proved by experiments. (3) due to the easy delamination of sandwich plate, according to the mechanical characteristics and failure form of sandwich plate, By setting an initial delamination for marine SPS structure, the free vibration and dynamic response of marine SPS sandwich structure under delamination damage are studied. The dynamic responses of intact sandwich plate and delaminated sandwich plate are compared and analyzed. To facilitate processing of LS-DYNA output data, In this paper, a software Figure3D. (4) is developed by using M language to process data and display 3D graph directly. Finally, the dynamic response of SPS stiffened plate under low speed impact is studied in detail by using LS-DYNA software. The free vibration and shock dynamic responses of the traditional stiffened SPS structure and the SPS stiffened plate are compared and analyzed.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U661.43
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