LS-DYNA有压容器抗侵彻能力研究
时间:2018-12-03 09:10 来源:毕业论文 作者:毕业论文 点击:次
| 摘要压力管道是最常用的压力容器，广泛用于各个行业部门，其遭受冲击作用破坏后内充介质的泄漏会造成巨大危害，研究影响管道冲击破坏的因素及规律对压力管道的设计和防护有重要意义。本文针对压力管道在预制破片横向冲击作用下的变形破坏过程，分析了内压作用下圆管各向应力关系，建立了管道变形破坏的理论模型；同时基于LS-DYNA有限元软件，研究了破片贯穿压力管道的极限穿透速度及其影响规律，并进行了实验验证。研究表明：管道壁厚和破片长径比是影响极限穿透速度的主要因素，壁厚越大极限穿透速度越大，长径比越大极限穿透速度越小；圆头弹比平头弹拥有更强的侵彻能力；内充压力的存在削弱了压力管道的抗冲击载荷能力。30976 关键词：压力管道；冲击；穿透；极限穿透速度 毕业论文设计说明书外文摘要 Title Anti - penetration capability analysis of pressure vessels Abstract Pressure pipe is the most common pressure vessel, which is widely used in all aspects of life, the impact damage after filling medium leakage will cause great harm,the research of the impact factors of the pipeline damage is important to the pressure piping design and protection. Based on pressure pipeline under the action of transverse impact prefabricated fragment deformation and failure process of the internal pressure were analyzed under the action of circular tube to stress relationship, establish the theoretical model of the pipe deformation and failure; At the same time, based on the finite element software LS-DYNA, fragment was studied through the limit of pressure piping penetration speed and its influence, and experimental verification. Research shows that: the pipe wall thickness and broken the long diameter ratio is the main factors influencing the limit penetration rate, the greater the wall thickness limit penetration rate, the greater the length to diameter ratio, the greater the limit penetration rate is smaller; Round head to play better than flat nose has strong penetration ability; The existence of the filling pressure weakens the pressure in the pipeline resistance to impact load capacity. Keyword pressure piping shock strike limit perforating velocity 目 次 1 绪论 1 1.1引言 1 1.2国内外研究现状 1 1.2.1国外研究现状 1 1.2.2国内研究现状 2 1.3 本文研究内容 3 1.3.1本文主要研究内容 3 1.3.2本文主要工作 3 2 理论分析 5 2.1管道应力分析 5 2.1.1.内压作用下薄壁圆管中的应力分布 5 2.1.2内压作用下厚壁圆筒中的应力分布 6 2.2.穿透破坏模式与经验公式 6 2.3动量与能量守恒模型 7 2.3.1.动量守恒 7 2. 3.2 动量守恒 9 2.4 本章小结 9 3 圆柱破片侵彻圆管过程仿真计算 10 3.1 仿真软件介绍 10 3.1.1 LS-DYNA软件介绍 10 3.1.2 LS-DYNA基本算法介绍 10 3.2 仿真模型的建立 11 3.2.1平头圆柱破片侵彻管道过程仿真计算 11 3.2.2圆头圆柱破片侵彻管道过程仿真计算 15 3.2.3不同长径比圆柱破片侵彻管道过程仿真计算 17 3.2.4平头弹冲击不同内压管道 19 3.3试验验证 21 3.3.1引言 21 (责任编辑：qin) |