亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Fatigue Testing of Out-of-Plane Bending Mechanism of Chain Links

系泊 结构工程 张力(地质) 弯曲 链条(单位) 旋转(数学) 计算机科学 材料科学 工程类 海洋工程 物理 极限抗拉强度 复合材料 人工智能 天文
作者
Lucile Rampi,Pedro Vargas
标识
DOI:10.1115/omae2006-92488
摘要

Three years ago, several mooring chains of an off-loading buoy failed after only 8 months of service. These chains were designed according to conventional fatigue assessment using API RP 2SK T-N curves to a fatigue life or 20 years with a factor of safety equal to 3 on life. Of particular interest is that the mooring chain failure underwent significant mooring chain motions that caused interlink rotations. Although traditionally neglected, these interlink rotations, when combined with significant chain tensions can cause bending stresses in the chain links (See Figure 1). This recently identified phenomena, Out-of-Plane Bending (OPB), explains the extensive fatigue damage causing the mooring chains of the off-loading buoy to fail [3][4][5]. References [3] and [4] document full scale tests of the OPB mechanism using a full scale test frame with the ability of applying inter-link rotation to a pre-tensioned chain. This testing confirmed that interlink rotations with a constant tension load can result in significantly high stresses. OPB stresses were measured on four different chain sizes of various grades: 1) 81 mm Studded Grade R3S, 2) 107 mm Stud-less Grade RQ3, 3) 124 mm Stud-less Grade R4, and 4) 146 mm Stud-less Grade RQ4, Grade R3 in [3] and [4], but no actual fatigue tests were performed. References [3] and [5] document analytical and computational efforts to explain and quantify the OPB stresses. In this paper, special focus is placed on obtaining actual fatigue failures of chains from OPB loading. Smaller chain sizes (40 mm) are used to accommodate the load limits of the testing frame. To mimic the actual loading as close as possible, sub size models of actual chainhawses were used in the testing. Two chainhawses were used: 1) the chainhawse has internal curvature where a link rests on the intrados, similar to offloading buoy that failed in eight months, and 2) a straight chainhase, a design that is in use today with demonstrated improved fatigue performance over the curved chainhawse. OPB stresses are measured and reported. Fatigue loading in the OPB mode was applied for several configurations. The two chainhawse exhibit very different stress levels and fatigue performance. An empirical relationship previously reported in [3][4][5] is compared to the measured OPB stresses with mixed results. Although limited in number, the fatigue tests indicate that overall the chain fatigue performance is at or above the B1 DnV curve. The BS B1 curve is also compared.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
11秒前
15秒前
CATH完成签到 ,获得积分10
16秒前
20秒前
zhanghao发布了新的文献求助10
20秒前
Hillson完成签到,获得积分10
29秒前
糯糯完成签到 ,获得积分10
38秒前
59秒前
自由飞阳完成签到,获得积分10
1分钟前
小羡完成签到 ,获得积分10
1分钟前
滕皓轩完成签到 ,获得积分20
1分钟前
aDou完成签到 ,获得积分10
1分钟前
George完成签到,获得积分10
1分钟前
oscar发布了新的文献求助10
1分钟前
oscar完成签到,获得积分10
1分钟前
1分钟前
1分钟前
2分钟前
2分钟前
疯狂的自行车完成签到,获得积分20
3分钟前
Akim应助科研通管家采纳,获得10
3分钟前
我睡觉不会困12138完成签到 ,获得积分10
4分钟前
脑洞疼应助xiongdi521采纳,获得10
4分钟前
阿泽完成签到 ,获得积分10
4分钟前
疯狂的自行车关注了科研通微信公众号
4分钟前
kohu完成签到,获得积分10
4分钟前
4分钟前
kohu发布了新的文献求助10
4分钟前
5分钟前
正直的松鼠完成签到 ,获得积分10
5分钟前
核桃发布了新的文献求助10
6分钟前
Xw关闭了Xw文献求助
6分钟前
6分钟前
Xw关闭了Xw文献求助
6分钟前
6分钟前
Swear完成签到 ,获得积分10
6分钟前
勤恳冰淇淋完成签到 ,获得积分10
7分钟前
7分钟前
El发布了新的文献求助10
7分钟前
7分钟前
高分求助中
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3990075
求助须知:如何正确求助?哪些是违规求助? 3532108
关于积分的说明 11256369
捐赠科研通 3271016
什么是DOI,文献DOI怎么找? 1805171
邀请新用户注册赠送积分活动 882270
科研通“疑难数据库(出版商)”最低求助积分说明 809228