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Miniature reproduction of raking tests on marine structure: Similarity technique and experiment
Engineering Structures ( IF 5.6 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.engstruct.2020.110527
Miguel A.G. Calle , Mika Salmi , Leonardo M. Mazzariol , Pentti Kujala

Abstract Substantial progress has been made in the last decades to computationally model the structural response of marine structures subjected to collision and grounding accidents. The finite element method stands out as the most reliable and robust technique within other tools for this purpose. However, there are still some complex physical aspects arduous to be modeled numerically. This work presents an experimental technique to reproduce the mechanical response and collapse mode of marine structures subjected to collision and grounding events by using miniature models built by additive manufacturing. This experimental technique relies on structural scaling and thickness distortion formulations. A raking test on a large-scale ship bottom was replicated in a 1:30 reduced scale to validate this technique. The miniature ship bottom structure was additively manufactured from stainless steel 316L considering all structural details. Flat dog-bone samples with different thicknesses were also built in the same way for mechanical characterization of the material via tensile tests and microscopy analysis of material fractures. Tensile tests showed a good consistency in stress-strain curves with a small, but noteworthy, influence of plate thickness and a large dispersion in rupture elongations. The fractured sections revealed various void formations around non-sintered metal powder. In spite of that, the structural response obtained from miniature test showed a good correspondence with the large-scale reference test when both are brought to the same dimensional scale.

中文翻译:

海洋结构倾斜试验的微型复制:相似性技术和实验

摘要 在过去的几十年里,在对发生碰撞和搁浅事故的海洋结构的结构响应进行计算建模方面取得了重大进展。为此,有限元方法是其他工具中最可靠和最稳健的技术。然而,仍有一些复杂的物理方面难以用数值模拟。这项工作提出了一种实验技术,通过使用增材制造构建的微型模型来重现遭受碰撞和搁浅事件的海洋结构的机械响应和倒塌模式。这种实验技术依赖于结构缩放和厚度畸变公式。以 1:30 的缩小比例复制了对大型船底的倾斜测试,以验证该技术。考虑到所有结构细节,微型船底结构由 316L 不锈钢增材制造。不同厚度的扁平狗骨样品也以相同的方式构建,用于通过拉伸试验和材料断裂的显微镜分析来表征材料。拉伸试验表明,应力-应变曲线具有良好的一致性,板厚的影响很小,但值得注意,断裂伸长率的离散性很大。断裂部分揭示了非烧结金属粉末周围的各种空隙形成。尽管如此,当两者被带到相同的尺寸尺度时,从微型试验获得的结构响应与大规模参考试验显示出良好的对应关系。不同厚度的扁平狗骨样品也以相同的方式构建,用于通过拉伸试验和材料断裂的显微镜分析来表征材料。拉伸试验表明,应力-应变曲线具有良好的一致性,板厚的影响很小,但值得注意,断裂伸长率的离散性很大。断裂部分揭示了非烧结金属粉末周围的各种空隙形成。尽管如此,当两者被带到相同的尺寸尺度时,从微型试验获得的结构响应与大规模参考试验显示出良好的对应关系。不同厚度的扁平狗骨样品也以相同的方式构建,用于通过拉伸试验和材料断裂的显微镜分析来表征材料。拉伸试验表明,应力-应变曲线具有良好的一致性,板厚的影响很小,但值得注意,断裂伸长率的离散性很大。断裂部分揭示了非烧结金属粉末周围的各种空隙形成。尽管如此,当两者被带到相同的尺寸尺度时,从微型试验获得的结构响应与大规模参考试验显示出良好的对应关系。拉伸试验表明,应力-应变曲线具有良好的一致性,板厚的影响很小,但值得注意,断裂伸长率的离散性很大。断裂部分揭示了非烧结金属粉末周围的各种空隙形成。尽管如此,当两者被带到相同的尺寸尺度时,从微型试验获得的结构响应与大规模参考试验显示出良好的对应关系。拉伸试验表明,应力-应变曲线具有良好的一致性,板厚的影响很小,但值得注意,断裂伸长率的离散性很大。断裂部分揭示了非烧结金属粉末周围的各种空隙形成。尽管如此,当两者被带到相同的尺寸尺度时,从微型试验获得的结构响应与大规模参考试验显示出良好的对应关系。
更新日期:2020-06-01
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