Influence of Internal Stresses on the Wear of Steel

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  • 鋼の摩耗に及ぼす内部応力の影響
  • コウ ノ マモウ ニ オヨボス ナイブ オウリョク ノ エイキョウ

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Abstract

In the present paper, the effects of internal stresses on the wear have been studied by using test plates of mild steel under dry and lubricated conditions. Under dry condition, the wear rate increases with the internal stress regardless of its direction. The wear rate and volume of wear fragments are in linear relations with the elastic strain energy σ2/2E where E is the elastic modulus. The wear mechanism is considered to be the phenomenon due to shearing of adhered points, and the increase in wear rate with the stress is attributed mainly to the growth of wear fragment size. Under lubricated condition, transition points appear in wear curves. The sliding distance to the transition point and the reciprocal of steady state wear rate decrease with tensile stress and increase with the compressive stress. These relations are found to be quite analogous to S-N curve in usual fatigue tests where the mean stress is varried under the constant stress amplitude, and the mechanism of wear is considered as the fatigue of surface asperities.

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