基本信息
项目批准号：51505321
申请代码：E0508
项目名称：高速列車(chē)用(yòng)铝合金搅拌摩擦焊接头超高周疲劳行為(wèi)与剩余寿命研究
项目负责人：
董鹏
依托单位：
太原理(lǐ)工大學(xué)
研究期限：2016-01-01 至 2018-12-31
资助经费：20.0（万元）
项目摘要
中文(wén)摘要：
基于高效率、低成本、优质、环保等优势，搅拌摩擦焊（FSW）必将成為(wèi)新(xīn)一代铝合金高速列車(chē)的主导连接技术。随着高速列車(chē)运营速度的不断提高，焊接接头的超高周疲劳性能(néng)是保证列車(chē)安全服役的重要前提。当前对高速列車(chē)铝合金FSW接头的研究主要针对于高、低周疲劳失效问题，忽视了潜在的超高周疲劳失效风险。本项目拟针对高速列車(chē)铝合金FSW接头的超高周疲劳问题开展研究，明确其超高周疲劳特性，揭示超高周疲劳断裂机理(lǐ)，阐明母材状态、焊接条件、焊后处理(lǐ)和环境介质对接头超高周疲劳性能(néng)的影响，厘清接头超高周疲劳物(wù)理(lǐ)损伤过程和微观损伤机制，以及构建超高周疲劳损伤方程，实现FSW接头的损伤预测和剩余寿命评估。本项目的完成可(kě)加深对铝合金FSW接头超高周疲劳损伤本质的理(lǐ)解和认识，丰富焊接接头超高周疲劳断裂理(lǐ)论，為(wèi)FSW在高速列車(chē)制造中的成熟应用(yòng)提供理(lǐ)论支持，并為(wèi)高速列車(chē)的安全服役和可(kě)靠性评定提供科(kē)學(xué)依据。
英文(wén)摘要：
Based on the intrinsic advantages such as high efficiency, low cost, superior quality and environmentally friendly, friction stir welding (FSW) will become the predominant joining technology of next generation high-speed trains. With the high-speed trains operating speed increased, fatigue property of welded joints at very high cycles is one of the most important prerequisite for the security service. Current researches mainly focus on fatigue failure of FSW joints in low and high cycles, ignoring the risk of very high cycle fatigue (VHCF) failure. This project proposed for FSW joints of aluminum alloys to explore the characteristics and fracture mechanism of VHCF behavior, and clarify the effects of base metal state, welding parameters, post-weld treatments and environments on the VHCF properties. Further, physical damage process and micromechanism as well as damage equation of FSW joints will be investigated to predict the damage state and residual life of the joints. The completion of this project is beneficial for the understanding of VHCF damage essence of FSW joints, and enriches VHCF failure theory of welded joints, promoting the mature application of FSW in high-speed train manufacturing and providing scientific basis for safety service and reliability assessment of high-speed trains.
——来自https://kd.nsfc.gov.cn/
