Relaxation of Internal Forces in a Wound Reel of Magnetic Tape

[+] Author and Article Information
H. Tramposch

Applied Research Department, Pitney-Bowes, Inc., Stamford, Conn.

J. Appl. Mech 32(4), 865-873 (Dec 01, 1965) (9 pages) doi:10.1115/1.3627328 History: Received February 20, 1964; Revised March 01, 1965; Online September 15, 2011


Equations were developed to predict the relaxation of the internal stresses of a wound reel of magnetic tape, assuming a homogeneous and isotropic material which, under shear, exhibits instantaneous elasticity, delayed elasticity, and creep; and under hydrostatic stressing, shows elastic behavior. Numerical examples obtained with the aid of a high-speed digital computer indicated that the internal stresses introduced during the winding operation continue to relax. Given sufficient time in storage, the wound reel will approach stress-free conditions, thus exposing the tape to mechanical damage during transportation and reuse.

Copyright © 1965 by ASME
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