Hollow fan blades made of titanium alloy are widely used in turbofan engines, and the residual stress (RS) inside the blades directly affects the performance of the blades and even the engine. Therefore, it is crucial to measure and study the RS distribution of titanium alloy hollow fan blades. This paper aims to investigate the RS distribution on the cross-section of a wide-chord hollow fan blade made of Ti-6Al-4 V titanium alloy. The multiple-cut contour method is utilized to determine the RS. A theoretical model of the multiple-cut contour method for fan blades is established, and the specimen was cut three times, followed by contour measurement of the cut planes, data processing and elastic finite element analysis. The RS map of the three cut planes is finally presented. The normal RS on three cross-sections of the fan blade is uniformly distributed, ranging from -50 MPa to 50 MPa. The normal RS distribution at different positions for the hollow fan blade can be obtained by the proposed multiple-cut contour method. The findings of this research provide a comprehensive insight into the distribution of RS in wide-chord hollow fan blades made of Ti-6Al-4 V titanium alloy.

钛合金空心风扇叶片广泛应用于涡扇发动机，叶片内部的残余应力（RS）直接影响叶片乃至发动机的性能。因此，测量和研究钛合金空心风扇叶片的RS分布至关重要。本文旨在研究Ti-6Al-4V钛合金宽弦空心风扇叶片横截面的RS分布。利用多重切割轮廓法来确定RS。建立了风扇叶片多次切割轮廓法的理论模型，对试件进行了3次切割，并对切割面进行了轮廓测量、数据处理和弹性有限元分析。最后给出了三个切面的RS图。风扇叶片三个截面上的法向RS均匀分布，范围为-50 MPa至50 MPa。通过所提出的多切割轮廓方法可以获得空心风扇叶片不同位置的正态RS分布。这项研究的结果提供了对Ti-6Al-4V钛合金宽弦空心风扇叶片RS分布的全面了解。