Anisotropic 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 34(4), 888-894 (Dec 01, 1967) (7 pages) doi:10.1115/1.3607852 History: Received September 08, 1966; Revised April 14, 1967; Online September 14, 2011


Equations were developed to describe the relaxation of the internal stresses of a wound reel of magnetic tape, with allowances for the effects of surface roughness between tape layers and unequal thermal expansion of hub and tape-layer body. Numerical examples obtained with the aid of a high-speed digital computer indicated that the surface roughness as well as the unequal thermal expansion of hub and tape-layer body greatly affect the internal stress distribution. Essentially independent of the surface roughness, a typical reel, when stored at 120 F after being wound at 70 F and when the coefficient of thermal expansion of the hub is three times the value of the tape material, will approach stress-free conditions about 80 percent earlier than when it is stored at the winding temperature.

Copyright © 1967 by ASME
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