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钛合金以其良好的性能得到工业界广泛的应用,但是钛合金建造和焊接工艺极难控制,容易产生焊接缺陷。本文利用声发射技术对不同厚度钛合金焊接接头拉伸和疲劳损伤过程进行动态监测,获得了钛合金焊接接头焊缝从裂纹萌生、扩展、直至断裂过程的声发射事件数量、幅度、危险程度分布特性,提出了钛合金焊接接头疲劳损伤声发射阶段性理论,为声发射技术应用于钛合金结构服役过程的全寿命安全监测提供了理论依据。
Titanium alloy with its good performance has been widely used in the industry, but the titanium alloy construction and welding process is extremely difficult to control, prone to welding defects. In this paper, the acoustic emission technique was used to dynamically monitor the tensile and fatigue damage processes of the welded joints of titanium alloy. The number, amplitude and distribution of acoustic emission events of the welded joints of titanium alloy welded joints from initiation, propagation and fracture of the cracks were obtained Characteristics of titanium alloy welded joint, the theory of acoustic emission stage of fatigue damage of titanium alloy welded joint is put forward, which provides a theoretical basis for the life-long safety monitoring of the acoustic emission technology applied to the service life of titanium alloy structure.