High-strength bainitic steels have acquired a promising place among steels due to their wide applications in engineering structures. It is, therefore, worthwhile to investigate their fatigue performance in different environments. When fatigue is atmospheric, lattice strength of weaker zones including granular bainite, phase boundary and MA constituents determines the nucleation life of fatigue. DESIGN OF MACHINE ELEMENTSLow Cycle and High Cycle Fatigue For a 2D normal stress case The shaft is made of plain carbon steel 45C8 and the tensile yield strength is 380 N/mm2. The factor of safety is 2. Determine the diameter of the shaft using the maximum shear stress theory. Creep
With the increase of design fatigue life of many critical mechanical components and engineering structures, research on very high cycle fatigue (VHCF) has become a new topic for engineering components failure. This paper summarizes works of VHCF of high strength steel, such as the observations on fish-eye, which is one of the typical characteristics in VHCF regime; Characteristics of Faculty of Technology and Science Materials Engineeringconcept the mechanical fatigue could be sub-divided into:low cycle fatigue (LCF) up to 10 6 cycles to failure; high cycle fatigue (HCF) between 10 6 and 10 8 cycles to failure and very high cycle fatigue (VHCF) over 10 8 cycles to failure. The VHCF represents the main point of interest in this study. Review of the Margins for ASME Code Fatigue Design Effect of water flow rate on fatigue life of A333Gr 6 carbon steel in highpurity Effect of flow rate on lowcycle fatigue of carbon steel tube bends in highpurity from current design procedures, e.g., stress analysis rules, and cycle counting. However, the ASME Code permits alternative approaches, such as finiteelement
Jan 01, 2021 · High and very high cycle fatigue (VHCF) tests were performed with 17-4PH stainless steel under constant amplitude (CA) and variable amplitude (VA) loading at load ratios of 1 and 0.05. Stepwise (duplex) S-N curves were determined with failure from surface inclusions above the transition stress amplitude, tr , and from the interior below tr . Very High-Cycle Fatigue Properties and Residual Stress Oct 09, 2019 · In this paper, EA4T alloy railway axle steel was shot peened with steel balls and ceramic balls with a diameter of 50 m, and 109-cycle fatigue tests of unpeened and peened specimens were carried out. The fatigue properties and the surface compression residual stress relaxation processes were investigated. The results of surface fracture observation indicated that all the cracks initiated LOW AND HIGHCYCLE FATIGUE PROPERTIES OF VARIOUS Abstract Lowcycle fatigue properties were investigated on four carbon steels and five low alloy steels specified in JIS (Japanese Industrial Standard) for machine structural use, which are the most commonly used in Japan. Several different heats from each of several representative manufacturers were sampled so as to represent the average fatigue characteristics of current materials.