【作者】 梁瑜；

【导师】 任慧龙；

【作者基本信息】 哈尔滨工程大学 ， 船舶与海洋结构物设计制造， 2010， 硕士

【摘要】 2006年4月,IACS颁布了《散货船共同结构规范》和《双壳油船共同结构规范》,在船级社历史上第一次将疲劳强度列入散货船与油船的船级条件。但二者对疲劳强度的评估采用了重大不同的处理方法,造成了计算结果的差异。本文对CSR的疲劳强度评估部分做了较为深入的研究,主要工作内容有以下几个方面:1)系统阐述《散货船共同结构规范》和《双壳油船共同结构规范》疲劳强度评估的基本流程和主要内容,发现二者疲劳评估方法还是存在着比较大的差异,主要表现在疲劳载荷、工况、应力合成、S-N曲线、Weibull形状参数、热点应力插值方式等方面。2)重点从以下三个对疲劳评估结果起着决定性作用的关键点入手,对CSR疲劳评估进行深入研究:(1)疲劳载荷的确定;(2)疲劳校核部位的选取;(3)热点应力法中有限元网格尺寸的确定及热点应力提取与插值方式:3)根据CSR疲劳强度评估要求,从影响焊接接头疲劳强度的因素、提高抗疲劳性能的节点设计方法和提高抗疲劳性能的工艺方法等几方面,对船舶节点的抗疲劳设计展开讨论。其中“提高抗疲劳性能的节点设计方法”,以一条11万吨原油轮为例,对甲板横向强框架的大肘板趾部等6个部位,每个部位给出两种常见的节点形式,根据CSR TANKER规范,计算出各个部位、不同节点形式的累积损伤。通过对同一部位的两个节点形式的疲劳评估结果进行对比分析,找出了疲劳寿命更优的节点结构形式,对今后船舶节点的抗疲劳设计,提供一些参考性建议。更多还原

【Abstract】 Common Structural Rules for Bulk Carriers and Oil Tankers (CSR) which was developed by IACS has gone into effect on 1st April 2006 and unified the building standard of Bulk Carriers and Oil Tankers, but on fatigue assessment method there are still some differences between Bulk Carriers and Oil Tankers. The main content in this paper are as follows:1) The basic processes and the main contents of Fatigue strength assessment method in Common Structure Rules was summarized and dissertated. Author found that there is a relatively big difference between both fatigue assessment methods, mainly manifested in the fatigue load, loading condition, stress range composition, S-N curve selection, Weibull parameter selection, and so on.2) Emphasis analysis on following three critical points for fatigue assessment of CSR was carried out:(1) The fatigue load;(2) The selection of fatigue assessment locations;(3) The size of the finite element mesh and the hot spot stress extraction and interpolation method in hot spot stress method.3) According to the fatigue assessment of CSR, design against fatigue failure was studied and analyzed by the main factors that affect the fatigue strength of welded joints, hull structural details design methods and workmanship processes methods of improving fatigue performance. According to CSR TANKER rules, the fatigue analysis for a 110,000 DWT oil tanker was carried out, a series of good hull structural details were searched after and some reasonable suggestions about design against fatigue failure were given.更多还原