Author : Pawan Kumar Singh Nain 1
Date of Publication :20th November 2017
Abstract: The measurement of the fatigue power of casts with residual casting skin remains a problem. To date, the only consideration of the ruggedness of the casting skin during the design process was the reduction factor. Nevertheless, the consequence of discontinuities including inhomogeneous microstructures, imperfections, pores etc. is ignored by this reduction element. This work shows the rim zone of the cast, consisting of surface ruggedness and a deviating microstructure. In order to evaluate the effect of the casting skin on fatigue strength, fatigue experiments with deviating skin testers have been carried out on EN-GJS-400-15 and EN-GJS-700-2. In cyclical axial stress tests under alternation loading Rт= –1 on small flat specimens extracted from the rim zone, a cyclic conduct of the rim area microstructure was established. In addition, cyclical propensity tests were performed with alternating R5-0=-1 and pulsatory loading R − 0 in the integration of the findings from axial fatigue tests with an effect on surface roughness as well as stress gradients present in the casting components. The conclusions drawn from the study are translated into a formulation for a fatigue examination of the remainder of the casted tissue.
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