对不同表面状态Ti80合金试样进行拉伸、冲击、疲劳试验，结合数字图像相关方法及扫描电镜的分析结果，研究了Ti80合金动态、静态加载下的力学行为。结果表明：Ti80合金表面打磨态和深缺口试样的抗拉强度比表面抛光试样大，预制裂纹试样的抗拉强度下降较为明显，断后伸长率随着表面质量的下降及缺口深度的增加而减小；不同表面状态试样的冲击吸收能量随着表面质量的下降及缺口深度的增加显著降低；Ti80合金的疲劳性能对试样的表面状态极为敏感，表面打磨划痕及微小缺口会使材料的疲劳寿命显著降低；不同表面状态试样的力学性能对动态加载过程更为敏感。

The tensile, impact and fatigue tests of Ti80 alloy samples with different surface states were carried out. Combined with the analysis results of digital image correlation method and scanning electron microscope, the mechanical behavior of Ti80 alloy under dynamic and static loading was studied. The results show that the tensile strength of Ti80 alloy surface polished and deep notch samples was larger than that of surface polished samples. The tensile strength of prefabricated crack samples decreased obviously, and the elongation after fracture decreased with the decrease of surface quality and the increase of notch depth. The impact absorbed energy of samples with different surface states decreased significantly with the decrease of surface quality and the increase of notch depth. The fatigue performance of Ti80 alloy was very sensitive to the surface state of the sample. The surface grinding scratches and small notches would significantly reduce the fatigue life of the material. The mechanical properties of samples with different surface states were more sensitive to the dynamic loading process.