微小円孔を有する電着銅薄膜による二軸応力検出法 : ひずみ感度に及ぼす周波数および波形の影響

概要

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In order to examine the effects of frequency and the wave form of cyclic stress on the strain sensitivity of biaxial stress measurement method using an electrodeposited copper foil with microcircular holes, pulsating tension tests are done to the stainless steel specimen glued the copper foil and recrystalized copper foil. The higher the frequency becomes, the lower the strain sensitivity becomes. And in the case of sine wave, the relationship between stress amplitude σph0.5 corresponding to slip occurrence rate of 50% at the periphery of micro circular holes and the mean strain rate 4n σph0.5/E per one forth cycle, where n is the frequency expressed by Hertz and E is Young's modulus of the material stress measured, is expressed as σph0.5=Alog(4n σph0.5/E)+B. So, σph0.5 to optional frequency can be estimeted by this equation. Also, the strain sensitivity is affected by wave form and it becomes highest in the case of square wave and becomes lower in ramp wave than sine wave. If the copper foil is recrystalized, the strain sensitivity increases but the effect of the difference of wave form decreases.
2004-06-25