Reliability Analytics Corporation
Previous | Next      Search Home

First 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 Last

First 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 Last

Previous | Next      Search Home

Where: k2 = 17.7 x 103 which includes a lubrication constant Since the second phase of wear is severe and relatively short, it can normally be assumed that the calculated number of cycles, N0, for the first phase of wear will be the life of the actuator. During the second or severe wear phase, the following equation can be used to determine the rate of wear (Reference 45): V = N-Nq) (9.7) H Where: V = Volume of material removed by wear during the second phase, in3 K = Wear coefficient (See Table 9-2) W = Applied load, lb d = Sliding distance, in H = Penetration hardness, psi N = Total number of cycles to failure N0 = Number of cycles at the end of the initial wear phase Solving for//results in the equation: VH N = +Nn (9-8) KWd 0 This second phase of wear is characterized by rapid wear until failure of the actuator occurs usually as a result of poor response due to excessive leakage. The leakage rate past the piston within the cylinder may be modeled as laminar flow between parallel plates (Reference 5). Q = 7i D2 a3 Ap 12 vL (9-9) Actuators 9-8 Revision C

Toolkit Home

Reliability Analytics Corporation
reliabilityanalytics.com