基本信息
项目批准号：51405358
申请代码：E0508
项目名称：铝合金搅拌摩擦焊管材液压成形机理(lǐ)及组织演变规律研究
项目负责人：胡志(zhì)力
依托单位：武汉理(lǐ)工大學(xué)
研究期限：2015-01-01 至 2017-12-31
资助经费：25.0（万元

项目摘要
中文(wén)摘要：
航空航天领域轻量化的发展，对铝合金薄壁异型截面管件的需求不断增多(duō)。此类管件结构复杂、径厚比大，主要存在制坯困难，难以整體(tǐ)成形等问题。本项目提出搅拌摩擦焊(FSW)旋压复合制管工艺解决铝合金薄壁管材制备难题，结合液压成形技术，运用(yòng)理(lǐ)论建模、数值模拟及工艺试验等方法研究铝合金FSW管材液压成形机理(lǐ)及组织演变规律。重点研究FSW管材液压成形中圆角充填规律、管材起皱行為(wèi)，以及形变热处理(lǐ)对FSW接头组织及性能(néng)的调控机制等科(kē)學(xué)问题。揭示FSW管材极限圆角半径的变化机理(lǐ)，阐明FSW管材“有(yǒu)益皱”形成的几何和力學(xué)条件，主动控制多(duō)约束加载条件下焊缝所引入的不均匀变形特征，揭示FSW管材液压成形中的约束与变形协调机制，明晰FSW接头在变形及热处理(lǐ)协同作用(yòng)下组织演变及其强韧化机理(lǐ)。為(wèi)铝合金FSW管材液压成形技术在航空航天领域的应用(yòng)提供理(lǐ)论基础和技术支撑。实现FSW与液压成形等研究领域广度和深度的同步扩展。
英文(wén)摘要：
Due to the increasingly urgent lightweight demand in the aerospace industry, the application of thin-walled aluminum alloy tube with variable cross section continues to expand in the aircraft and aerospace industry. Such tubes always have complex shape and large radius-to-thickness ratio. It is difficult to obtain such tubes by conventional manufacturing processes. In this project, large diameter thin-walled aluminum alloy tubes were produced using a hybrid process combining friction stir welding (FSW) and spinning, and the hydroforming mechanism and microstructural evolution of the aluminum alloy FSW tubes were studied by theoretical modeling, numerical simulation and experiments. The emphasis was put on the basic deformation law and wrinkling behavior of the FSW tube during hydroforming, and the regulation mechanism on microstructure and mechanical properties of FSW joints during thermomechanical treatment was also investigated in detail. The limiting corner radius of the FSW tubes was analyzed, and the theoretical value was verified. The formation of the geometric and mechanical conditions of the "beneficial wrinkles" for FSW tubes was clarified, and the constraining effect of weld on wrinkling behaviors of the FSW tubes during hydroforming was revealed by the classical theory of plasticity instability. The evolution of the mircrostructure and the toughening mechanism of the FSW joint under thermomechanical treatment were obtained. The aim of the project is to provide theory foundation and technology support to the application of hydroforming the FSW tubes.
 
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