Closed form expression for fatigue life prediction at combined HCF/LCF loadingJelaska, Damir (Avtor) Glodež, Srečko (Avtor) Podrug, Srđan (Avtor) machine elementsfatigueservice life predictioncrack initiationcrack growthstress historyFor combined HCF/LCF loading, whose stress history is simplified so that it consists of one LCF stress block with a number of cycles equal to the number of start-up in-service operations and one HCF stress block with all HCF cycles summed-up, we derived the closed form expression for estimating both the crack initiation life and the crack propagation life at combined HCF/LCF loading. As an example of use, Smith and Haigh diagrams were obtained for titanium alloy (Ti-6Al-4V) components, which enable to estimate the fatigue strength for the designed fatigue life, known load ratio and certain number of HCF cycles per one combined stress block.20032012-06-01 12:07:50Neznano27721UDK: 621.833:539.388.1COBISS_ID: 8422422ISSN pri članku: 0354-2009NUK URN: URN:SI:UM:DK:AUXGHOEEsl