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E2 = Modulus of elasticity, piston, lbs/in2 Substituting Equation (9-3) into Equation (9-2) and adding a constant for lubrication provides an equation for the number of cycles for an actuator during the initial wear phase until the severe wear period begins. N0=k, YFy ' ws %Dx-D2 a L DxD2 ML' + (9-4) Where: ki = 15.4 x 103 which includes a lubrication constant In a similar way, if the actuator is subjected to axial stress, Equation (9-5) can be used to determine compressive stress. Which equation to use depends on the application of the actuator, axial or side loading. Sc = 0.9 WA 1/3 DA 2 y + V V (9-5) J2 J J Where: WA = Axial Load on the actuator, Ibf And: NQ=k2 WA r \2 A A ~A 1/3" DA 2 y l-tfl-TJ^2 W + (9-6) Ji J J Actuators 9-7 Revision C

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