焼結鉄における引張り強さと疲れ強さの関係について

概要

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Although many investigations have been made on the mechanical properties of sintered iron compacts, few have been made on the fatigue behaviour. The fatigue strength of sintered iron compacts is one of the most important factors when it is used under repeated stress. Since the sintered iron compacts generally have many pores; the purpose of the present work are as follows; to investigate the notch effect caused by the stress concentration arising from pores at the tensile and fatigue tests, and then, to further investigate the relation between the tensile and fatigue strength.<BR>The following conclusions are obtained from the above investigations:<BR>1) As the porosity of sintered iron compacts is increased, the tensile and fatigue strength are reduced. But when the porosity is constant, the pore size and its shape have influence on the tensile and the fatigue r strength-particulary, stronger influence on the latter than the former.<BR>2) Most of sintered iron compacts have the fatigue ratio (the ratio of the endurance limit to the tensile strength) in the range of 0.23-0.6, and the fatigue ratio decreases with increasing porosity.
社団法人粉体粉末冶金協会の論文