Study on Fatigue Strength Evaluation of Ship Structural Members in The Ocean Going

远洋船舶结构件疲劳强度评估研究

• 批准号: 09450377
• 负责人: TOMITA Yasumitsu
• 金额: $ 5.89万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450377/
• 关键词: fatigue design; ship structural member; ocean going; fatigue strength; crack growth; loading model

In order to develop a more reliable and accurate fatigue design method for ship structural members, a new type of fatigue design chart is proposed. These charts are derived by the following three procedures : (1) use of fatigue crack growth analysis as the basis for fatigue strength evaluation, (2) implementation of the authors' new storm model for the time history of stress occurrence induced by wave load and (3) incorporation of a new sailing model instead of the all headings model. The charts are 3-dimensional and are composed of the following three parameters : 1) maximum stress amplitude in the external load, 2) stress concentration factor and 3) fatigue crack length in cracked structural members. They can be prepared for any fatigue life and be used for initial fatigue design instead of the current fatigue design code. They also predict the residual fatigue life in cracked structural members when fatigue cracks are found after a certain service period.

为了发展一种更可靠、更精确的船舶结构构件疲劳设计方法，提出了一种新型的疲劳设计图。这些图表是通过以下三个过程得出的：（1）使用疲劳裂纹扩展分析作为疲劳强度评估的基础，（2）实施作者的新风暴模型，用于波浪载荷引起的应力发生的时间历程，（3）采用新的航行模型代替全航向模型。这些图表是三维的，由以下三个参数组成：1）外部载荷中的最大应力幅，2）应力集中系数和3）裂纹结构构件中的疲劳裂纹长度。它们可用于任何疲劳寿命，并可用于初始疲劳设计，而不是当前的疲劳设计规范。他们还预测剩余疲劳寿命在开裂的结构构件时，疲劳裂纹后发现一定的服务期。

项目成果

H.Kawabe, Y.Tomita, M.Toyofuku and T.Fukuoka: "Design Wave Condition for Extreme Wave-Induced Loads Based on Linear Response Prediction"International Conference on Ship and Shipping Research -NAV2000-. Vol.II. 7.6.1-7.6.10 (2000)

H.Kawabe、Y.Tomita、M.Toyofuku 和 T.Fukuoka：“基于线性响应预测的极端波浪诱发载荷的设计波浪条件”船舶与航运研究国际会议 -NAV2000-。

T.Fukasawa, M.Morikawa, T.Fukuoka, K.Shibazaki, A.Ito and Y.Tomita: "On the Simplified Method to Predict the Long-Term Probability of Occurrence of Stress of a Ship Caused by Wave Pressure"International Conference on Ship and Shipping Research -NAV2000-.

T.Fukasawa、M.Morikawa、T.Fukuoka、K.Shibazaki、A.Ito 和 Y.Tomita：“关于预测波浪压力引起的船舶应力长期发生概率的简化方法”国际会议

Y.Tomita, et al.: "Fatigue Strength Evaluation of Ship Structural Members Based on Fatigue Crack Growth Analysis"International Conference on Ship and Shipping Research Conference Proceedings. Vol.II. 10.4.1-10.4.11 (2000)

Y.Tomita等人：“基于疲劳裂纹扩展分析的船舶结构件的疲劳强度评估”国际船舶与航运研究会议论文集。

H.Kawabe, et al.: "Design Wave Condition for Extreme Wave-Induced Loads Based on Linear Response Prediction"International Conference on Ship and Shipping Research Conference Proceedings. Vol.II. 7.6.1-7.6.10 (2000)

H.Kawabe 等人：“基于线性响应预测的极端波浪诱发载荷的设计波浪条件”国际船舶与航运研究会议论文集。

T.Fukasawa, et al.: "On the Simplified Method to Predict the Long-Term Probability of Occurrence of Stress of a Ship Caused by Wave Pressure"International Conference on Ship and Shipping Research Conference Proceedings. Vol.II. 7.4.1-7.4.10 (2000)

T.Fukasawa 等人：“关于预测由波浪压力引起的船舶应力发生长期概率的简化方法”国际船舶与航运研究会议论文集。