ANALYSIS OF SURFACE TRACTIONS IN COMPLEX FRETTING FATIGUE CYCLES USING QUADRATIC-PROGRAMMING

Real fretting fatigue cycles often involve complex loading where the f retting force may vary with a different phase or frequency to the othe r loads on the components. Analysis of the contact tractions in such c ases can be difficult. Here we present a quadratic programming techniq ue which enables the shear tractions to he determined in a relatively straightforward manner. A number of sample load histories are investig ated and it is shown that the shear traction cycle rapidly shakes down to a steady state. Further the results are relatively insensitive to the manner in which loading is commenced.