考虑防止焊接诱发屈曲的船舶薄板实践设计

IF 0.5 4区 工程技术 Q4 ENGINEERING, MARINE
Hong Zhou, Bin Yi, Jiangchao Wang, Chaonan Shen
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引用次数: 0

摘要

_在先进船舶中,薄壁舱段的轻量化制造是一种流行趋势,焊接屈曲产生的尺寸公差对后矫直的制造精度和进度有很大影响。本文以某高科技客船上部结构的典型薄截面为研究对象。基于焊接固有变形理论,采用热弹塑性和弹性有限元相结合的方法,对传统的制造工艺和焊接条件进行了预先检验,并将焊接屈曲行为与制造观察结果进行了比较。实际上,通常有两种方法来防止先进制造的焊接屈曲。装配几何特征优化、弹性模量优良的加强筋,提高船舶薄壁刚度,采用先进的焊接方法减小焊接固有变形,减小机械载荷。计算结果表明,减小焊接面内固有应变或提高结构刚度均可减小焊接屈曲的幅度,避免轻量化制造过程中焊接屈曲的产生。近年来,采用薄板设计的轻量化结构已成为船舶、火车、飞机等先进交通工具,特别是高科技客船的一大亮点。薄板截面和薄壁结构具有足够的强度,在提高承载能力和保护环境方面表现出优异的性能,同时也降低了燃料消耗。然而,随着为实现轻量化设计而减少板厚,由于刚度降低,焊接引起的屈曲可能成为最复杂的面外焊接变形类型(Wang et al. 2015, 2018)。屈曲变形不仅会降低制造精度和完整性,还会增加成本和工期;此外,它还影响力学性能,如流体力学。然而,由于其不稳定的特点,焊接屈曲在冷却至室温后,用火焰加热或机械校正很难消除。因此,提前考虑实际设计,减少焊接过程中的屈曲变形是可取的。焊接条件、热效率、板厚、热源分布、加强筋间距等工艺参数影响焊接驱动力和结构刚度,应进行讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Practice Design of Ship Thin Section Considering Prevention of Welding-Induced Buckling
_ The lightweight fabrication of thin-walled cabin sections is popular for advanced ships, and the dimensional tolerance generated by welding buckling significantly influences the fabrication accuracy and schedule with poststraightening. A typical thin section employed in the superstructure of a high-tech passenger ship is considered the research object. Conventional fabrication procedures and welding conditions were examined beforehand with combined thermal elastic-plastic and elastic FE computations based on the theory of welding inherent deformation, while welding buckling was represented with identical behavior compared with fabrication observation. Actually, there are usually two methods to prevent welding buckling with advanced fabrication. Stiffeners with optimized geometrical features and excellent elasticity moduli were assembled to enhance the rigidity of the ship thin section, and less welding inherent deformation with advanced welding methods can be employed to reduce mechanical loading. Computational results show that either less in-plane welding inherent strain or higher structural rigidity can reduce the magnitude of welding-induced buckling, and avoid the generation of welding-induced buckling during the lightweight fabrication. Introduction Recently, lightweight construction with thin-plate designs has become the highlight of advanced vehicles, such as ships, trains, and airplanes, particularly high-tech passenger vessels. Thin plate sections, as well as thin-walled structures with sufficient strength, exhibit excellent performance in enhancing the carrying capacity and protecting the environment with less fuel consumption. However, with the reduction in plate thickness for achieving lightweight design, welding-induced buckling can be generated owing to the lower stiffness as the most complex type of out-of-plane welding distortion (Wang et al. 2015, 2018). Buckling deformation will not only decrease fabrication accuracy and integrity but also increase cost and schedule; moreover, it influences mechanical performance, such as hydrodynamics. Unfortunately, it is hard to remove welding buckling after cooling to room temperature with flame heating or mechanical correction owing to its unstable features. Thus, it is preferable to reduce buckling distortion during the welding process by considering the practical design beforehand. Procedural parameters such as welding condition, heat efficiency, plate thickness, distribution of heat source, and stiffener spacing should be discussed because they influence the welding driving force and structural rigidity.
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来源期刊
CiteScore
1.10
自引率
0.00%
发文量
19
期刊介绍: Original and timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economics, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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