High Quality Light Weight Ship Using Ultra High Tensile Steels

使用超高强度钢的高质量轻型船舶

• 批准号: 01850094
• 负责人: UEDA Yukio
• 金额: $ 7.23万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01850094/
• 关键词: Design Permitting Buckling; Structural Reliability; Ultimate Strength; ISUM Rectangular Plate Element; Welding Deformation; Welding Residual Stress; Boxing Weld; Fatigue Strength; 高張力鋼; 高品質軽量化船; 座屈強度; HT係数; 理想化構造要素法; 信頼性評価

Welding deformations and residual stresses in ship structures built using high tensile steel have been studied and methods to predicts these are proposed. The difference of tensile strength is found to have little influence on the inherent strain which is the cause of residual stress and it is shown that the residual stress can be predicted by a proposed method based on the inherent strain. When the steel is TMCP type, softening of the material along the welding is observed. The effect of such softening on buckling and ultimate strength is studied for cases with different welding position and boundary condition. Fatigue strength of various weld joints such as boxing weld is also an important problem. New reliable method to evaluate the fatigue strength is proposed.For the full utilization of high tensile steel, it is effective to adopt a design concept which allows elastic buckling. The fatigue strengths of mild steel ship and high tensile steel ship are compared. Further, flowchart for structural design in which buckling is allowed is proposed. To evaluate the safety of a ship after damage, new efficient method based on the concept of plastic node is developed. It is shown that the computational time becomes 1/100 of that using conventional FEM. Using this method, the maximum bending strength of mid section of a ship is computed. In addition, a method to evaluate the reliability of a ship structure considering the statistical variation of external forces and dimensions of parts is proposed.

研究了高强度钢船体结构的焊接变形和残余应力，并提出了预测方法。抗拉强度的差异被发现有影响的固有应变，这是残余应力的原因，它表明，残余应力可以预测所提出的方法的基础上的固有应变。当钢是TMCP类型时，观察到材料沿着焊接软化。针对不同焊接位置和边界条件的情况，研究了这种软化对屈曲和极限强度的影响。各种焊接接头如盒形焊缝的疲劳强度也是一个重要问题。提出了一种新的可靠的疲劳强度评估方法，为了充分利用高强度钢，采用允许弹性屈曲的设计概念是有效的。比较了低碳钢船和高强度钢船的疲劳强度。此外，提出了允许屈曲的结构设计流程。为了评估船舶破损后的安全性，提出了一种基于塑性节点概念的新的有效方法。计算结果表明，该方法的计算时间仅为常规有限元法的1/100。用该方法计算了某船中剖面的最大抗弯强度。此外，还提出了一种考虑外力和构件尺寸统计变化的船体结构可靠性评估方法。

项目成果

上田 幸雄,冨田 康光,梅崎 一夫,水野 博介,川本 要次,西村 信一,楠葉 貞治: "繰り返し軸圧縮荷重を受ける薄板防撓板の座屈許容設計(その1)" 日本造船学会論文集. 170. 503-511 (1991)

Yukio Ueda、Yasumitsu Tomita、Kazuo Umezaki、Hirosuke Mizuno、Yoji Kawamoto、Shinichi Nishimura、Sadaharu Kusunoha：“承受重复轴向压缩载荷的薄板加劲肋的屈曲公差设计（第 1 部分）”日本造船学会汇刊 170。 503-511（1991）

上田 幸雄,Sherif M.H.Rashed Yehia AbdelーNasser: "An Improved ISUM Rectangular Plate ElementーTaking Account of PostーUltimate Strength Behaviorー" 日本造船学会論文集. 171. (1992)

Yukio Ueda，Sherif M.H.Rashed Yehia Abdel-Nasser：“改进的 ISUM 矩形板单元 - 考虑后终极强度行为”日本造船学会论文集 171。（1992 年）。

上田 幸雄;Sherif M.H. Rashed;Yehia Abdel-Nasser: "An Improved ISUM Rectangular Plate Element Taking Account of Post-Ultimate Strength Behavior" 日本造船学会論文集. 171. (1992)

Yukio Ueda；Sherif M.H. Rashed；Yehia Abdel-Nasser：“考虑到最终强度行为的改进 ISUM 矩形板单元”日本造船学会汇刊 171。（1992 年）

上田 幸雄、袁 敏剛: "T型およびI型継手の溶接残留応力の固有ひずみによる推定法ー溶接残留応力の生成源を用いた残留応力推定法(第3報)ー" 溶接学会論文集. 9-3. 19-25 (1991)

Yukio Ueda、Mingang Yuan：“利用固有应变的T型和I型接头焊接残余应力的估算方法——利用焊接残余应力源的残余应力估算方法（第3次报告）”日本焊接学会会议录。 9-3。19-25（1991）

勝田 順一、上田 正治、豊貞 雅宏: "二相域圧延したTMCP鋼の脆性き裂伝播解析" 日本造船学会論文集. 167. 261-269 (1990)

Junichi Katsuta、Masaharu Ueda、Masahiro Toyosada：“两相区轧制 TMCP 钢的脆性裂纹扩展分析”日本造船学会汇刊 167. 261-269 (1990)。