钛合金结构干涉配合铆接疲劳试验研究

干涉配合能提高接头疲劳寿命,已成为目前最有效的强化工艺方法之一。国内外飞机制造中已广泛应用干涉配合,但我国目前飞机制造中的干涉配合铆接只限于铝合金结构。钛合金优越的性能使其在飞机结构中的应用比例大幅提高,但钛合金结构的干涉配合铆接在我国飞机制造中还是一个空白。针对某型机的实际结构对钛合金结构的干涉配合铆接疲劳性能进行了试验研究。研究结果表明,较普通铆接干涉配合铆接可明显提高接头疲劳寿命,加载的应力水平越低,疲劳寿命提高越明显。另外,钉孔间隙等工艺参数对疲劳寿命增益也有较大影响。

Research on Fatigue Experimental of Interference Fit Riveting of Titanium Alloy Structure

Interference-fit is a well-known technique for improving the fatigue life of joints,which has been widely adopted in aerospace manufacturing industry.The excellent performance of titanium alloy has greatly improved its application in aerospace structures.However,interference-fit riveting in our country is still limited to aluminum alloy structures,there is few studies on the interference-fit riveting in titanium structures.Fatigue experiments were carried out on titanium structures with different interference-fit levels in this paper.It was found that interference-fit riveting can greatly improve the fatigue life of joints compared with conventional riveting.The increment of fatigue life by interference-fit riveting becomes more obvious at lower level loads.Processing parameters,such as the gap between hole and pin,also have great effects on the fatigue life.