Portable stand for mechanical multi-cycle tests and fatigue strength research of steel specimens

For mechanical multi-cycle tests and fatigue strength studies of steel specimens, a simple portable bench unit has been created. Such tests are especially relevant in the study of specimens obtained with the help of additive technologies, which have specific features due to the specific production technology, consisting in the construction of the finished product by layer-by-layer build-up of powder material. The most convenient scheme of cyclic loading of the test specimen based on cantilever bending and possessing a number of advantages: simplicity of realization, testing performance, relatively low cost, adaptability and variability to loading conditions and additive technologies research, versatility, etc., was used when creating the stand. The block diagram of the stand, its appearance, the shape of the specimen loading cycle are presented, and the operation of the portable stand is described. The micromagnetic method — the Barkhausen effect method, which is closely related to the domain structure of the material, was used as a method for studying the kinetics of fatigue damage accumulation in the samples. Multi-cycle bending tests were carried out on specimens made of 09G2S low-alloy structural steel manufactured in accordance with GOST by additive technology (by selective laser fusion/sintering) and by casting. Experimental dependences of the influence of the number of loading cycles on the intensity of magnetic noise in the samples of one of the batches at low stress amplitude in the range of loading cycles variation from 1.5 × 10⁶ to 6.9 × 10⁶ are presented, as a result, the performance and efficiency of the stand are demonstrated. The bench allows to test small-sized specimens and to study in detail the process of fatigue damage accumulation with the growth of the basic value of the number of loading cycles and has the ability, if necessary, to set the required loading algorithm for multi-cycle tests and can be used in factory and laboratory conditions.

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