| TC4钛合金扩散焊接头剪切疲劳性能研究 |
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| 引用本文： | 招文龙,刘小刚,谢佩玉,郭海丁.TC4钛合金扩散焊接头剪切疲劳性能研究[J].航空发动机,2020,46(3):99-102. |
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| 作者姓名： | 招文龙 刘小刚 谢佩玉 郭海丁 |
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| 作者单位： | 南京航空航天大学能源与动力学院,南京210000,南京航空航天大学能源与动力学院,南京210000,南京航空航天大学能源与动力学院,南京210000,南京航空航天大学能源与动力学院,南京210000 |
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| 摘 要： | 为了研究钛合金扩散焊接头在航空航天领域焊接性能的稳定性,制备了双搭接形式的接头试样,在温度为910℃、压力为3.4 MPa条件下对TC4钛合金板材进行扩散连接,并对双搭接接头试样开展静强度试验,获得试样在焊缝界面处的平均剪切强度约为199.4 MPa,试样断裂前后接头没有发生明显的塑性变形。此外,对双搭接接头试样还开展了不同载荷水平下的疲劳性能试验。结果表明:疲劳试样存在3种不同破坏模式。在高载荷水平下,试样会在切应力主导下发生基板与搭接板的完全脱焊;在低载荷水平下,试样会在正应力主导下发生基板沿厚度方向的断裂;在中等载荷水平下,试样先发生局部脱焊随后沿基板厚度方向断裂。在上述失效模式分析的基础上,结合疲劳寿命试验数据分别得到接头的正应力-寿命和切应力-寿命曲线。
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| 关 键 词： | 扩散连接 钛合金 搭接接头 剪切疲劳寿命 疲劳性能试验 静强度试验 航空发动机 |
Study on Shear Fatigue Performance of TC4 Titanium Alloy Diffusion Bonded Joints |
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| Authors: | ZHAO Wen-long LIU Xiao-gang XIE Pei-yu GUO Hai-ding |
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| Affiliation: | (College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China) |
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| Abstract: | In order to study the stability of the welding performance of titanium alloy diffusion bouded joints in aerospace field,a double lap joint specimen was prepared.Diffusion bonding of TC4 titanium alloy plates was carried out at temperature of 910℃ and pressure of 3.4MPa.A static strength test was carried out on the specimen of double lap joint,and the average shear strength of the specimen at the weld interface was about 199.4 MPa,and no obvious plastic deformation occurred before and after fracture of the specimen.Fatigue performance tests at different loading levels were also carried out on the specimen of double lap joint.The results show that there are three different failure modes in fatigue samples.At the high load level,the specimen will undergo complete dewelding between the substrate and the lap plate under the shear stress.At the low load level,the fracture of the substrate along the thickness direction occurs under normal stress.At the medium load level,local de-welding occurs first and then fracture along the substrate thickness direction.Based on the above failure mode analysis,the normal stress-life and shear stress-life curves of the joints are obtained by combining the fatigue life test data. |
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| Keywords: | diffusion bonding titanium alloy lap joint shear fatigue life fatigue performance test static strength test aeroengine |
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