基本信息
项目批准号：11672010
申请代码：A0802
项目名称：高强铝合金搅拌摩擦焊接头高周疲劳薄弱區(qū)域与小(xiǎo)裂纹扩展研究
项目负责人：
孙國(guó)芹
依托单位：
北京工业大學(xué)
研究期限：2017-01-01 至 2020-12-31
资助经费：60.0（万元）
项目摘要
中文(wén)摘要：
“加快大型飞机研制”是國(guó)家“十三五”计划实施的百个重大工程之一，高强铝合金的搅拌摩擦焊技术作為(wèi)飞机重要结构件的一种制造新(xīn)技术，它的质量要求关系着人们的生命安全，而且已达到國(guó)家战略的高度。针对目前高强铝合金搅拌摩擦焊接头疲劳失效问题、小(xiǎo)裂纹扩展机理(lǐ)及疲劳寿命预测理(lǐ)论还需要深入研究和发展，本项目以飞机常用(yòng)高强铝合金材料的搅拌摩擦焊接头為(wèi)研究对象，以建立搅拌摩擦焊接头疲劳寿命预测理(lǐ)论為(wèi)目标，以接头的高周疲劳失效及小(xiǎo)裂纹扩展研究為(wèi)基础，系统研究搅拌摩擦焊接头疲劳薄弱區(qū)域预测模型和小(xiǎo)裂纹扩展定量描述模型等关键科(kē)學(xué)问题，通过试验数据进行理(lǐ)论验证，提出一种基于小(xiǎo)裂纹扩展理(lǐ)论的搅拌摩擦焊接头疲劳寿命预测方法，為(wèi)服役的搅拌摩擦焊焊接关键结构部件提供准确的疲劳寿命预测，為(wèi)重大设备的安全使用(yòng)提供理(lǐ)论和技术支撑。
英文(wén)摘要：
“Speed up the large aircraft development” is one of the 100 major projects on the implementation of 13th Five-Year Plan in our country. As a new technology of manufacturing aircraft structural parts, the friction stir welding technology of high strength aluminum alloy relates to people's lives. Its quality has already been brought into national strategy. Aiming at the deep research and development of the issues of fatigue failure, small crack propagation and life prediction method, in the project with the friction stir welded joints of high strength aluminum alloy as the research project, establishing the fatigue life prediction method as the goal, based on the study of high-cycle fatigue failure and small crack propagation, the key scientific issues of models of fatigue weak area prediction and small crack propagation are studied in the project. A fatigue life prediction method for the friction stir welded joints is proposed based on the small crack propagation method which is verified with the test data to provide precise fatigue life prediction for the important friction stir welded structure components in the service and offer theoretical and technical support for the safe use of important equipment.
——来自https://kd.nsfc.gov.cn/
