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Harmonic Analysis of a Solder Paste under Large Amplitude Oscillatory Shear
Author(s) -
Karis Thomas E.,
Kim Chul A.,
Jhon Myung S.
Publication year - 2002
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20020901)287:9<583::aid-mame583>3.0.co;2-q
Subject(s) - rheometer , materials science , amplitude , harmonics , shear rate , rheology , sawtooth wave , shear stress , shear (geology) , mechanics , crossover , waveform , nonlinear system , composite material , physics , optics , quantum mechanics , voltage , artificial intelligence , computer science , computer vision
Large amplitude oscillatory shear experiments, as an alternative measurement technique for nonlinear rheology, were performed using a cone‐plate rheometer with a solder paste. We found that odd harmonics appear in the stress waveform. A two‐segment, piecewise linear model was introduced to analyze the experimental observation. The procedure for calculating the crossover shear rate, the first and second region viscosity, and an apparent yield stress from harmonic amplitude data are shown. This technique observes a time‐dependent structural transition between the unsteady initial state and the secondary state. We found that the crossover time depends on shear rate amplitude and can be represented in the quadratic form of imposed shear rate.