Papers by Keyword: Longitudinal Deformation

Abstract: Acceptable variations in the length of the valve stem, in a conventionally manufactured valve, give room to the possibility of the stem to buckle and get jammed in the guide. Salvaging such a situation is expensive and time consuming. The present paper addresses this problem by increasing the compliance of the valve stem by introducing holes in it. The desired elastic deformation along the length, however, causes transverse deformation, which needs to be minimized. The use of multiple holes helps achieve this. Taguchi Method based Design of Experiments using L25 orthogonal array has been used for performing the parametric design to arrive at the best settings of the 5 parameters. The optimal settings eliminate the buckling and thus make the operation of the valve stem robust against manufacturing variabilities.

Abstract: In this study uncertainties of measurement are evaluated for residual stresses in coatings determined by the method of measurement of the longitudinal deformation of a tubular substrate, a wire substrate and a strip substrate. Higher uncertainty was observed in the case of applying a thin coating on a strip substrate. The precision of the equipment depends on the elastic element used for measurement of the longitudinal deformation of the substrate. Residual stresses were determined in the galvanic nickel coating deposited on a tubular substrate, a wire substrate and a strip substrate from the Watts bath. Copper and brass was used as the material of the substrate. The investigated experimental system is presented.