“…carried out on rollers and balls to examine the influence of failure mechanisms, operating conditions, lubrication modes, roller materials, etc., on fatigue strength (Machida et al, 1993;Deng et al, 1999;Nakajima and Mawatari, 2005;Matsuo et al, 1991;Coy et al, 1981;Rohn et al, 1981). Murakami (2002) proposed an equation for predicting the fatigue limit, which considers the size of microdefects or inclusions.…”