アルミニウム薄膜の疲労すべり変形を利用した疲労ゲージに関する基礎的研究 : 第2報,粗さ変化の基礎的特性およびこれに及ぼす材料因子の影響

概要

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The evolution of surface roughness of aluminum foil caused by fatigue slip deformation is dependent on cyclic stress and the number of cycles. In order to use aluminum foil as a fatigue gauge by utilizing its surface roughness, isoroughness curves are obtained and an empirical formula for them is proposed. Effect of material factor, i.e. grain size and thickness of the foil, on the evolution of roughness is also investigated. It is found that evolution of roughness is well represented by R_a = (σ^<a/2>/k_o) N^<1/2> + m, where a and k_o and m are material constants. Accordingly, if the number of cycles N and the center line average height R_a is measured, the applied stress is evaluated by this formula. It is also found that the effect of the thickness on the roughness is remarkable, while the effect of grain size is very small. This is beneficial to control the strain sensitivity without causing the gauge length.
一般社団法人日本機械学会の論文
1991-06-25