DEVELOPMENT OF DAMAGE MONITORING SENSORS FOR SHIP STRUCTURES

船舶结构损伤监测传感器的开发

• 批准号: 09555305
• 负责人: FUJIMOTO Yukio
• 金额: $ 3.78万
• 依托单位: HIROSHIMA 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 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555305/
• 关键词: STRUCTURAL MONITORING; SACRIFICIAL SPECIMEN; SENSOR; SHIP STRUCTURE; FATIGUE; STRESS MONITORING; FATIGUE MONITORING; SMART STRUCTURE; 損傷予知

Sacrificial specimen is a small sized fatigue specimen which is designed so that fatigue damage may be produced in the specimen sufficiently earlier than in a structural member when it is secured to the structural member. In this study, two types of sacrificial specimens which are secured onto the structural member by using adhesive agent are developed. First one is a sacrificial specimen with ordinary sensitivity, of which purpose is to predict fatigue life of structural members. Second one is a sacrificial specimen with high sensitivity, of which purpose is to estimate the level of long term stress distribution working on structural member.The sacrificial specimens are applied to smooth specimen, notched specimen, and welded joint specimen and fatigue tests are carried out under constant Stress amplitude and block loading with exponential distribution. It is found that the sacrificial specimens show stable fatigue properties under fatigue loading and have high sensitivity for fatigue damage. Fatigue cracks are produced in the sacrificial specimen sufficiently earlier than in the structural member. Especially, for the sacrificial specimen with high sensitivity type, fatigue crack is initiated under very small stress amplitude of 2.5MPa.Further, a method to predict fatigue life of structural member and a method to estimate the level of long term stress distribution are developed based on the fatigue damage condition monitored in the sacrificial specimen.

牺牲样本是小尺寸的疲劳样本，其被设计成当样本固定至结构构件时，可以比结构构件更早地在样本中产生疲劳损坏。在本研究中，开发了两种使用粘合剂固定到结构构件上的牺牲样本。第一个是普通灵敏度的牺牲试件，其目的是预测结构件的疲劳寿命。第二个是高灵敏度的牺牲试件，其目的是估计结构构件长期工作的应力分布水平。牺牲试件适用于光滑试件、缺口试件和焊接接头试件，在恒定应力幅和指数分布的块载荷下进行疲劳试验。结果发现，牺牲试件在疲劳载荷作用下表现出稳定的疲劳性能，并且对疲劳损伤具有较高的敏感性。牺牲样本中产生疲劳裂纹的时间比结构构件中产生的早得多。特别是对于高灵敏度类型的牺牲试件，在 2.5MPa 的非常小的应力幅值下就会引发疲劳裂纹。此外，基于牺牲试件中监测到的疲劳损伤状况，开发了预测结构件疲劳寿命的方法和估计长期应力分布水平的方法。

项目成果

藤本由紀夫: "構造物の疲労損傷予知のための犠牲試験片の開発" 日本造船学会論文集. 182号. 705-713 (1998)

Yukio Fujimoto：“用于预测结构疲劳损伤的牺牲测试件的开发”日本造船学会汇刊第 182. 705-713 号（1998 年）。

Fujimoto,Yukio: "Development of Sacrificial Specimen for Fatigue Damage Prediction of Structures" The Eighth Int.Offshore and Polar Engineering conference. Vol.4. 367-374 (1998)

藤本幸雄：“结构疲劳损伤预测牺牲样本的开发”第八届国际近海和极地工程会议。

藤本由紀夫: "構造物の疲労損傷予知のための犠牲試験片の開発" 日本造船学会論文集. 182号. 705-713 (1997)

Yukio Fujimoto：“用于预测结构疲劳损伤的牺牲样本的开发”日本造船学会汇刊第 182. 705-713 号（1997 年）。

Yukio Fujimoto: "Development of Sacrificial Specimen for Fatigue Damage Prediction of Structures" The Eighth International Offshore and Polar Engineering Conference. Vol.4. 367-374 (1998)

藤本幸雄：“结构疲劳损伤预测牺牲样本的开发”第八届国际近海和极地工程会议。

新宅英司: "ロボットによる製品の工作精度計測に関する研究" 西部造船会々報. 94号. 195-204 (1997)

Eiji Shintaku：“使用机器人测量产品工作精度的研究”西方造船协会杂志第 94. 195-204 (1997)。