合金焊覆焦炭转鼓锁孔优化

J. Fernando, Enzo Falo, Henry Kwok, Millar Iverson, L. Wong, Simon Yuen, L. Chan
{"title":"合金焊覆焦炭转鼓锁孔优化","authors":"J. Fernando, Enzo Falo, Henry Kwok, Millar Iverson, L. Wong, Simon Yuen, L. Chan","doi":"10.1115/pvp2022-78705","DOIUrl":null,"url":null,"abstract":"\n Coke drums are subjected to severe cyclic thermal and structural loading, and have therefore become canonical examples of thermo-mechanical fatigue failure. One of the most common locations of fatigue failure is at the skirt-to-shell attachment weld. To increase the fatigue life of the attachment weld, vertical slots and keyholes are often machined in a circumferential pattern near the top of the skirt to increase local flexibility near the weld. While this methodology provides a cost-effective means to improve the fatigue life of the attachment weld, stress concentrations that form at the keyholes result in crack initiation and propagation. As such, frequent repairs are necessary to prevent crack growth at the keyhole locations. In the present investigation, a new keyhole design consisting of N06625 overlay at the keyhole locations as a means of delaying crack initiation has been studied using FEA simulations. To further optimize the new design, a sensitivity study involving keyholes with and without fillets was also performed to determine the effect of fillet size on fatigue life. The results presented herein indicate that increasing the keyhole fillet radii mitigates the effect of stress concentrations on the corners of the keyholes, which delays crack initiation. Furthermore, it has been demonstrated that adding N06625 overlay at the keyhole protects the base metal from excessive plastic strain. In particular, the proposed design has been shown to improve the fatigue life of the keyhole by at least an order of magnitude when compared to analogous keyhole designs with no overlay, which has the potential to improve the overall cost-effectiveness of keyhole implementation by a significant margin.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"34 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2022-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Coke Drum Keyhole Optimization With Alloy Weld Overlay\",\"authors\":\"J. Fernando, Enzo Falo, Henry Kwok, Millar Iverson, L. Wong, Simon Yuen, L. Chan\",\"doi\":\"10.1115/pvp2022-78705\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n Coke drums are subjected to severe cyclic thermal and structural loading, and have therefore become canonical examples of thermo-mechanical fatigue failure. One of the most common locations of fatigue failure is at the skirt-to-shell attachment weld. To increase the fatigue life of the attachment weld, vertical slots and keyholes are often machined in a circumferential pattern near the top of the skirt to increase local flexibility near the weld. While this methodology provides a cost-effective means to improve the fatigue life of the attachment weld, stress concentrations that form at the keyholes result in crack initiation and propagation. As such, frequent repairs are necessary to prevent crack growth at the keyhole locations. In the present investigation, a new keyhole design consisting of N06625 overlay at the keyhole locations as a means of delaying crack initiation has been studied using FEA simulations. To further optimize the new design, a sensitivity study involving keyholes with and without fillets was also performed to determine the effect of fillet size on fatigue life. The results presented herein indicate that increasing the keyhole fillet radii mitigates the effect of stress concentrations on the corners of the keyholes, which delays crack initiation. Furthermore, it has been demonstrated that adding N06625 overlay at the keyhole protects the base metal from excessive plastic strain. In particular, the proposed design has been shown to improve the fatigue life of the keyhole by at least an order of magnitude when compared to analogous keyhole designs with no overlay, which has the potential to improve the overall cost-effectiveness of keyhole implementation by a significant margin.\",\"PeriodicalId\":23700,\"journal\":{\"name\":\"Volume 2: Computer Technology and Bolted Joints; Design and Analysis\",\"volume\":\"34 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2022-07-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Volume 2: Computer Technology and Bolted Joints; Design and Analysis\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1115/pvp2022-78705\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/pvp2022-78705","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

焦炭桶受到严重的循环热载荷和结构载荷,因此成为热机械疲劳失效的典型例子。最常见的疲劳失效地点之一是裙板与外壳的连接焊缝。为了提高附件焊缝的疲劳寿命,通常在裙边顶部附近加工成圆周图案的垂直槽和锁孔,以增加焊缝附近的局部柔性。虽然这种方法提供了一种经济有效的方法来提高连接焊缝的疲劳寿命,但在锁孔处形成的应力集中会导致裂纹的产生和扩展。因此,经常修理是必要的,以防止裂纹在锁眼位置扩大。在本研究中,采用有限元模拟的方法研究了一种新的锁孔设计,即在锁孔位置采用N06625覆盖层作为延迟裂纹起裂的手段。为了进一步优化新设计,还进行了涉及带圆角和不带圆角的钥匙孔的灵敏度研究,以确定圆角尺寸对疲劳寿命的影响。结果表明,增大锁孔圆角半径可减轻锁孔边角应力集中的影响,从而延缓裂纹的起裂。此外,还证明了在锁孔处添加N06625覆盖层可以防止母材过度的塑性应变。特别是,与没有覆盖层的类似锁孔设计相比,所提出的设计至少可以将锁孔的疲劳寿命提高一个数量级,这有可能显著提高锁孔实施的总体成本效益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
Coke Drum Keyhole Optimization With Alloy Weld Overlay
Coke drums are subjected to severe cyclic thermal and structural loading, and have therefore become canonical examples of thermo-mechanical fatigue failure. One of the most common locations of fatigue failure is at the skirt-to-shell attachment weld. To increase the fatigue life of the attachment weld, vertical slots and keyholes are often machined in a circumferential pattern near the top of the skirt to increase local flexibility near the weld. While this methodology provides a cost-effective means to improve the fatigue life of the attachment weld, stress concentrations that form at the keyholes result in crack initiation and propagation. As such, frequent repairs are necessary to prevent crack growth at the keyhole locations. In the present investigation, a new keyhole design consisting of N06625 overlay at the keyhole locations as a means of delaying crack initiation has been studied using FEA simulations. To further optimize the new design, a sensitivity study involving keyholes with and without fillets was also performed to determine the effect of fillet size on fatigue life. The results presented herein indicate that increasing the keyhole fillet radii mitigates the effect of stress concentrations on the corners of the keyholes, which delays crack initiation. Furthermore, it has been demonstrated that adding N06625 overlay at the keyhole protects the base metal from excessive plastic strain. In particular, the proposed design has been shown to improve the fatigue life of the keyhole by at least an order of magnitude when compared to analogous keyhole designs with no overlay, which has the potential to improve the overall cost-effectiveness of keyhole implementation by a significant margin.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
High-Temperature Design of 700°C Heat Exchanger in a Large Scale High-Temperature Thermal Energy Storage Performance Test Facility On the Effect of Hot-Box Size on Coke Drum Skirt Fatigue Life Numerical Approaches for Bolt Interactions in Flange Gasket Assemblies Experimental Investigation on the Fatigue Strength for Different Tightening Procedures and Materials in Metric Screws Study on Post-Buckling Behaviors of Lower Heads for Fracture Control of Reactor Vessels Under BDBE
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1