Review on the Fatigue Strength of Additively Manufactured Metal Materials Under the Very High Cycle Fatigue

ABSTRACT The primary goal of this systematic literature review is to identify, characterize, and make a comprehensive analysis of the available research on the fatigue strength of additively manufactured (AMed) metal materials when subjected to loading cycles that exceed the preconceptualized fatigue limit ( cycles) and the very high cycle fatigue (VHCF) regime. Considering the inherent complexity and magnitude of influential variables present in AM metal processes, this paper explores in‐depth the relevant conclusions taken by theoretical/experimental studies and their respective results of several AMed materials in the VHCF regime. The present review focuses on key research topics of metal AM fatigue strength, such as crack initiation and failure mechanisms, examining the influence of microstructure and defects, the effect of the input process parameters, postprocessing methods, and the influence of testing conditions on fatigue strength.