The Transition to Quasi-Periodicity for Molten Plastics in Large Amplitude Oscillatory Shear

[+] Author and Article Information
D. W. Adrian, A. J. Giacomin

Rheology Research Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Eng. Mater. Technol 116(4), 446-450 (Oct 01, 1994) (5 pages) doi:10.1115/1.2904311 History: Received June 05, 1993; Revised December 07, 1993; Online April 29, 2008


Large amplitude oscillatory shear (LAOS) experiments on three grades of LLDPE including one commercial film blowing resin showed an interesting transition in the shear stress response to LAOS. The shear stress response is initially a nonsinusoidal standing wave which then undergoes a transition to quasi-periodicity. Many line-broadened odd and even harmonics were found in the shear stress amplitude spectra of the quasi-periodic responses. The transition time depends on shear strain amplitude and frequency, but it did not correlate with the weight average molecular weight of the LLDPE’s.

Copyright © 1994 by The American Society of Mechanical Engineers
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