Influence of post-processing treatments on the fatigue behavior of notched additive manufactured TA6V: Rapid fatigue characterization using staircase procedure and infrared techniques
Résumé
Engineering structures are routinely subjected to cyclic multiaxial stress states, the additive manufacturing (AM) process offers new opportunities for manufacturers to reach designs that can be tailored to the specific solicitations. The aim of this study is to characterize the High Cycle Fatigue (HCF) behavior of 3D printed Titanium alloy (i.e., TA6V) subjected to cyclic multiaxial stresses involving a stress gradient representative of the loading applied to a mechanical component (coupling). Thus, fatigue tests were conducted on TA6V notched specimens obtained with Selective Laser Meting (SLM) process. In addition to the staircase procedure, a thermographic approach using an infrared camera was applied on this particular material to quickly and easily compare different specimen configurations. The additive manufacturing process has made significant progress since few years and so the possibilities that it offers as well, i.e., lighter parts, fast build, and optimized designs. John Crane, which is a global leader in the design, development and providing of mechanical seals, filtration systems and power transmission couplings has found an interest to explore the potential of AM by developing couplings prototypes. A flexible coupling is a device used to connect two machines at their shaft ends for the purpose of transmitting torque, it is designed to accommodate misalignment and absorb shock loads (cf. Fig. 1).
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