基于复合夹层版的货船舷.doc
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基于复合夹层版的货船舷,摘 要随着海上交通日趋繁忙，有限的航线上航行船舶的密度越来越大，不时的会发生船舶碰撞的事故。船舶碰撞往往会引发船体结构破损甚至沉没、货物泄露、环境污染及人员伤亡等灾难性后果。因此，无论是从安全上、经济上，还是从环境保护上来看，进行船舶碰撞研究，提高船舶的耐撞性都具有重要意义。本文利用碰撞理论、试验及数值仿真分析对钢—聚...
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摘 要
随着海上交通日趋繁忙，有限的航线上航行船舶的密度越来越大，不时的会发生船舶碰撞的事故。船舶碰撞往往会引发船体结构破损甚至沉没、货物泄露、环境污染及人员伤亡等灾难性后果。因此，无论是从安全上、经济上，还是从环境保护上来看，进行船舶碰撞研究，提高船舶的耐撞性都具有重要意义。
本文利用碰撞理论、试验及数值仿真分析对钢—聚氨酯复合夹层板的耐撞特性进行了分析研究，对比了等质量情况下夹层板在抗冲击性能上较钢板所具有的优势。运用非线性有限元软件进一步分析了复合夹层结构尺寸参数对结构耐撞性能的影响。
将复合夹层板应用到船舶单层舷侧结构，分析该结构的耐撞性能；同时与常规舷侧结构进行比较分析，综合评估此复合舷侧结构的性能。本文主要研究工作如下：
(1) 介绍了聚氨酯材料的基本性能，及钢—聚氨酯夹层结构特点，此复合板具有优越的力学及其他方面的性能，在工程应用中越来越广泛，将其应用到船舶结构中也已有先例。但还未普及，需要做的研究工作还很多。
(2) 运用试验所得结果与有限元数值仿真进行比较，研究复合夹层板的建模方式对碰撞性能的影响，最终确定理想的复合夹层板建模方式。并综合比较了夹层板与普通钢板在碰撞性能上的优劣。
(3) 运用有限元数值仿真技术，探讨了夹层板不同的主尺度与厚度比对夹层板抗冲击性能的影响，得出主尺度与厚度比越小，夹层板的抗冲击性能越优越的结论。在此基础上设计了两个复合舷侧结构方案，用来替代原有单层舷侧。
(4) 利用有限元数值模拟分析了复合舷侧结构在受到横向冲击载荷作用下的力学行为，通过对损伤程度、最大碰撞力及吸能等方面的分析对比，综合评估了复合舷侧结构在碰撞性能上与原有舷侧结构所具有的独特优势。探讨了复合夹层板引用到船舶舷侧的可行性。
关键词： 复合夹层板；碰撞；试验；数值仿真；结构耐撞性
Abstract
The density of sailing ships is increasing rapidly on limited sailing routes with the increasingly busy marine traffic developed. The collision of ships happens easily, which leads to damage or sinking of the hull structure, cargo leakage, environmental pollution and disastrous consequences of casualties. So it has important significance to make collision research and to improve the crashworthiness of ships, either from the security, economic, or from the environmental point of view.
In this paper, the steel-polyurethane crashworthiness characteristics of composite structure was studied and analyzed based on collision theory, experiment, numerical simulation and energy absorption. The structure size parameters’ effect on crashworthiness of composite structure was analyzed based on nonlinear finite element structural analysis software. The composite structure was applied to single layer side structure and the crashworthiness performance was analyzed. The result was compared with the conventional structural crashworthiness analysis and a comprehensive assessment of the side structure of the composite performance was made. The main researches are listed below:
(1) Introduces the basic properties of the polyurethane materials, structural features of Steel polyurethane interlayer board. The Steel polyurethane interlayer board has excellent mechanical properties and other aspects performance, more and more widely used in engineering, existing precedent of application to ship structure. But not yet universal, need to do more research work.
(2) Use test result and finite element numerical simulation to obtain the ideal modeling method. Comprehensive compared the crashworthiness of steel plate and sandwich plate.
(3) Discussed influence on sandwich plate’s crashworthiness by finite element numerical simulation technology. Get the following conclusion: with main dimensions and thickness ratio decrease, the crashworthiness of sandwich plate becomes well. On the basis, designed two side structural concepts for replace original single port side.
(4) By finite element numerical simulation ,analyzed the mechanical behavior of composite port side structure by in transverse impact load. From the contrast of damage degree, maximum impact and absorbing energy, eva luated the composite port side structure's crashworthiness by in transverse impact. Discussed the feasibility of composite laminated plate apply to ship port side.
Keyword:Composite Sandwich panels; Collision; experiment; Numerical simulation;
Structural crashworthiness
目录
摘要 I
Abstract IV
目录 V
Contents VII
第1章 绪论 1
1.1 研究背景与意义 1
1.2 研究现状 2
1.3 研究方法 3
1.3.1 外部碰撞力学 3
1.3.2 内部碰撞力学 4
1.4 论文主要研究的内容 4
第2章 碰撞非线性有限元方法及复合夹层板基本理论 6
2.1 非线性有限元理论在船舶碰撞中的运用 6
2.2 非线性有限元分析方法 6
2.2.1 显式时间积分 6
2.2.2 拉格朗日型单元 7
2.2.3 接触算法 8
2.2.4 摩擦算法 9
2.2.5 仿真中沙漏的控制 10
2.2.6 材料的本构模型 10
2.3 聚氨酯介绍 13
2.4 钢聚氨酯复合夹层板 14
2.5 夹层结构的受力分析和强度理论 17
2.5.1 夹层板平衡方程 17
2.5.2 夹层板应变位移关系 19
2.6 复合夹层板大变形数值计算 21
2.6.1 大变形基本理论 21
2.6.2 大变形动力学数值计算方法 24
2.6.3 大变形动力学有限元基本解法与求解过程 26
2.7本章小结 27
第3章 钢—聚氨酯复合夹层板的冲击性能..
随着海上交通日趋繁忙，有限的航线上航行船舶的密度越来越大，不时的会发生船舶碰撞的事故。船舶碰撞往往会引发船体结构破损甚至沉没、货物泄露、环境污染及人员伤亡等灾难性后果。因此，无论是从安全上、经济上，还是从环境保护上来看，进行船舶碰撞研究，提高船舶的耐撞性都具有重要意义。
本文利用碰撞理论、试验及数值仿真分析对钢—聚氨酯复合夹层板的耐撞特性进行了分析研究，对比了等质量情况下夹层板在抗冲击性能上较钢板所具有的优势。运用非线性有限元软件进一步分析了复合夹层结构尺寸参数对结构耐撞性能的影响。
将复合夹层板应用到船舶单层舷侧结构，分析该结构的耐撞性能；同时与常规舷侧结构进行比较分析，综合评估此复合舷侧结构的性能。本文主要研究工作如下：
(1) 介绍了聚氨酯材料的基本性能，及钢—聚氨酯夹层结构特点，此复合板具有优越的力学及其他方面的性能，在工程应用中越来越广泛，将其应用到船舶结构中也已有先例。但还未普及，需要做的研究工作还很多。
(2) 运用试验所得结果与有限元数值仿真进行比较，研究复合夹层板的建模方式对碰撞性能的影响，最终确定理想的复合夹层板建模方式。并综合比较了夹层板与普通钢板在碰撞性能上的优劣。
(3) 运用有限元数值仿真技术，探讨了夹层板不同的主尺度与厚度比对夹层板抗冲击性能的影响，得出主尺度与厚度比越小，夹层板的抗冲击性能越优越的结论。在此基础上设计了两个复合舷侧结构方案，用来替代原有单层舷侧。
(4) 利用有限元数值模拟分析了复合舷侧结构在受到横向冲击载荷作用下的力学行为，通过对损伤程度、最大碰撞力及吸能等方面的分析对比，综合评估了复合舷侧结构在碰撞性能上与原有舷侧结构所具有的独特优势。探讨了复合夹层板引用到船舶舷侧的可行性。
关键词： 复合夹层板；碰撞；试验；数值仿真；结构耐撞性
Abstract
The density of sailing ships is increasing rapidly on limited sailing routes with the increasingly busy marine traffic developed. The collision of ships happens easily, which leads to damage or sinking of the hull structure, cargo leakage, environmental pollution and disastrous consequences of casualties. So it has important significance to make collision research and to improve the crashworthiness of ships, either from the security, economic, or from the environmental point of view.
In this paper, the steel-polyurethane crashworthiness characteristics of composite structure was studied and analyzed based on collision theory, experiment, numerical simulation and energy absorption. The structure size parameters’ effect on crashworthiness of composite structure was analyzed based on nonlinear finite element structural analysis software. The composite structure was applied to single layer side structure and the crashworthiness performance was analyzed. The result was compared with the conventional structural crashworthiness analysis and a comprehensive assessment of the side structure of the composite performance was made. The main researches are listed below:
(1) Introduces the basic properties of the polyurethane materials, structural features of Steel polyurethane interlayer board. The Steel polyurethane interlayer board has excellent mechanical properties and other aspects performance, more and more widely used in engineering, existing precedent of application to ship structure. But not yet universal, need to do more research work.
(2) Use test result and finite element numerical simulation to obtain the ideal modeling method. Comprehensive compared the crashworthiness of steel plate and sandwich plate.
(3) Discussed influence on sandwich plate’s crashworthiness by finite element numerical simulation technology. Get the following conclusion: with main dimensions and thickness ratio decrease, the crashworthiness of sandwich plate becomes well. On the basis, designed two side structural concepts for replace original single port side.
(4) By finite element numerical simulation ,analyzed the mechanical behavior of composite port side structure by in transverse impact load. From the contrast of damage degree, maximum impact and absorbing energy, eva luated the composite port side structure's crashworthiness by in transverse impact. Discussed the feasibility of composite laminated plate apply to ship port side.
Keyword:Composite Sandwich panels; Collision; experiment; Numerical simulation;
Structural crashworthiness
目录
摘要 I
Abstract IV
目录 V
Contents VII
第1章 绪论 1
1.1 研究背景与意义 1
1.2 研究现状 2
1.3 研究方法 3
1.3.1 外部碰撞力学 3
1.3.2 内部碰撞力学 4
1.4 论文主要研究的内容 4
第2章 碰撞非线性有限元方法及复合夹层板基本理论 6
2.1 非线性有限元理论在船舶碰撞中的运用 6
2.2 非线性有限元分析方法 6
2.2.1 显式时间积分 6
2.2.2 拉格朗日型单元 7
2.2.3 接触算法 8
2.2.4 摩擦算法 9
2.2.5 仿真中沙漏的控制 10
2.2.6 材料的本构模型 10
2.3 聚氨酯介绍 13
2.4 钢聚氨酯复合夹层板 14
2.5 夹层结构的受力分析和强度理论 17
2.5.1 夹层板平衡方程 17
2.5.2 夹层板应变位移关系 19
2.6 复合夹层板大变形数值计算 21
2.6.1 大变形基本理论 21
2.6.2 大变形动力学数值计算方法 24
2.6.3 大变形动力学有限元基本解法与求解过程 26
2.7本章小结 27
第3章 钢—聚氨酯复合夹层板的冲击性能..
