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Evaluating System of Applicability of High Strength Steels

高强度钢适用性评价体系

基本信息

批准号：
60850083
负责人：
UEDA Yukio
金额：
$ 4.29万
依托单位：
Welding Research Institute, 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：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850083/
关键词：
High Strength Steel Effectiveness of High Strength Steel Welding Initial Imperfection Ultimate Strength Corrosion Margin Idealized Stiffened Plate Element HT-factor HT係数甲板初期たわみ残留応力圧壊強度推定法有効初期たわみ係数軟鋼

项目摘要

In this project, a system to evaluate the effectiveness of the high tensile strength steel used for ship structures was developed. The main emphasis was put on deck panel which is attached to longitudinal and transverse members by welding. Welding initial imperfections are observed in such welded structures. Therefore, a systematic procedure to estimate the ultimate strength of panels with welding imperfections is developed. It consists of two stages. In the first stage, the welding imperfections, such as initial deflections and residual stresses, are estimated when the welding conditions are specified. Further, effective coefficient of initial deflection is evaluated theoretically. Then, the ultimate strength of the panels can be estimated by a simple formula in the second stage.So called HT-factor is commonly used as a measure to indicate the effectiveness of the high tensile strength steel compared to the mild steel. TH-factor is defined as a relative thickness of the high tensile s … More trength steel plate compared to the mild steel plate which has the same ultimate strength. For two kinds of steels, namely HT32 and HT36, the welding initial imperfections of panels with wide range of aspect ratio are estimated using the actual welding conditions. Further, the compressive strength of the panels with these imperfections are evaluated from the forementioned formula to compute the HT-factors.According to NK rule, 2.5 mm is required as the corrosion margin. HT-factor, which counts for the corrosion margin, can also be computed to evaluate the effectiveness of the high tensile strength steel by following the procedure developed in this project.However in the case of stiffened plate, the effectiveness of the high tensile strength steel can not be evaluated simply by the HT-factor as in the case of single panels. It requires close study of the collapse mechanism and the ultimate strength of the structures under consideration. To this purpose, an idealized stiffened plate element, which is superior in efficiency compared to ordinary FEM, is developed. Less

本研究开发了一套船舶结构用高强度钢的有效性评估系统。重点分析了通过焊接连接在纵、横向构件上的桥面板。在这样的焊接结构中观察到焊接初始缺陷。因此，一个系统的程序来估计板的极限强度与焊接缺陷的发展。它包括两个阶段。在第一阶段中，当焊接条件被指定时，估计焊接缺陷，例如初始挠度和残余应力。并从理论上计算了有效初挠度系数。然后，在第二阶段可以通过简单的公式估计板的极限强度。所谓的HT因子通常用作衡量高抗拉强度钢与低碳钢相比的有效性的指标。TH因子被定义为高抗拉强度材料的相对厚度， ...更多信息与具有相同极限强度的低碳钢板相比，低碳钢板具有更高的强度。以HT32和HT36两种钢为例，根据实际焊接条件，估算了宽高比范围内壁板的焊接初始缺陷。此外，根据上述公式计算具有这些缺陷的板的抗压强度，以计算HT因子。根据NK规则，需要2.5 mm作为腐蚀裕度。计算腐蚀裕度的HT因子也可以按照本项目开发的程序计算，以评估高抗拉强度钢的有效性。但是，在加筋板的情况下，不能像在单个板的情况下那样简单地通过HT因子来评估高抗拉强度钢的有效性。这就需要仔细研究所考虑的结构的倒塌机制和极限强度。为此，提出了一种理想化的加筋板单元，它比普通有限元具有上级效率。少