弯曲行为文献internal friction due to wire twist in bent cable.pdfVIP

INTERNAL FRICTION DUE T O WIR E TWIS T IN BEN T CABLE By Ole g G, Vinogradov 1 an d Irfan S. Atatekin2 d. ABSTRACT: A static and a quasi-static cyclic bending of a cantilever cable is e considered in order to investigate the friction losses in cables . It is assumed v r that slippage due to twisting of wires is a source of internal friction. Slippage e s e takes place within finite segments along the wire . It starts near the clamp and r s then propagates along the cable with the increase in load . The load-deflection t h characteristic becomes essentially nonlinear after the load exceeds some critical g i r l magnitude below which there is no slippage . Two type s of hysteretic loops are l a investigated: (1) Local, characterizing losses in a wire cross section; and (2) global, ; associated with the point of load application . It is shown that the local loop is y l n symmetrical and closed and that a unique correspondence exists between a load o e versus twisting characteristic of a wire in a simple bending and friction losses s u in this cross section in a cyclic bending . Similar correspondence between global l a characteristics of a cable is introduced . Numerical results for a one lay cable are n o given. s r e p r o INTRODUCTION F . E C Investigation s of dampin g force s i n vibratin g cable s hav e a lon g his -