An Overview of Fatigue Testing Systems for Metals under Uniaxial and Multiaxial Random Loadings

This paper presents an overview of fatigue testing systems in high-cycle regime for metals subjected to uniaxial and multiaxial random loadings. The different testing systems are critically discussed, highlighting advantages and possible limitations. By identifying relevant features, the testing systems are classified in terms of type of machine (servo-hydraulic or shaker tables), specimen geometry and applied constraints, number of load or acceleration inputs needed to perform the test, type of loading acting on the specimen and resulting state of stress. Specimens with plate, cylindrical and more elaborated geometry are also considered as a further classification criterion. This review also discusses the relationship between the applied input and the resulting local state of stress in the specimen. Since a general criterion to classify fatigue testing systems for random loadings seems not to exist, the present review-by emphasizing analogies and differences among various layouts-may provide the reader with a guideline to classify future equipment.

Automated summary

This paper provides an overview of fatigue testing systems for metals subjected to uniaxial and multiaxial random loadings in the high-cycle regime. Different testing systems are critically discussed and classified based on various features, with a focus on the relationship between applied input and resulting stress state in the specimen. The review aims to guide the classification of future equipment by highlighting analogies and differences among different layouts.