Prediction of high-cycle fatigue strength in a Ti-17 alloy blade after foreign object damage

• DOI: 10.1016/j.engfracmech.2020.107385
• Publication Date: 2020-10-28T02:06:29Z
• Authors: Zhenhua Zhao; Lingfeng Wang; Junhe Zhang; Lulu Liu; Wei Chen
• Keywords: Fatigue limit; Titanium alloy

Abstract Foreign object damage (FOD) tests and high-cycle fatigue (HCF) tests were carried out for Ti-17 titanium alloy simulation blades. The results showed that damage notches could be divided into semicircular and deflection types. The HCF strength of deflection-type specimens was lower than that of semicircular-type specimens. FOD and fatigue properties were characterized by scanning electron microscopy. The extrusion zone of deflection notches was inclined, reducing the fatigue strength compared with semicircular notches. A back-propagation neural network-based method for predicting the HCF strength of FOD simulation blades was developed, for which the prediction error was small.