On the Effect of External Heating on Fracture Fatigue Entropy

ABSTRACT A study is conducted to quantify the effect of different types of thermal loadings simultaneously with cyclic mechanical loading on the entropy generation of carbon steel (CS) 1018 under fully reversed bending fatigue. It is revealed that fatigue life decreases in response to thermal loading. Furthermore, the presence of thermal loading, the number of thermal cycles, the duration of thermal cycles, and the power of thermal loading do not exhibit a deviation in fracture fatigue entropy (FFE) from that of pure mechanical loading. FFEs are found to be between 18.3 and 22.3 MJ m −3 K −1 for several thermomechanical loading cases, falling in the range of previously reported values for CS 1018. The results of this study provide further evidence that FFE is a property of a material, and it remains constant in a narrow band range in response to external variables. Applying the paper's findings, the fatigue life of components under thermomechanical loading can be predicted using FFE.