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critical shear stress
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nature : polymer extrusion destabilizing flow of critical shear stress value to τ c said. When the shear rate over τ c, with the shear rate increase, from the appearance of extrusion appear rough and undulating, spiral twist or melt flow instability breakdown phenomenon, and therefore, forming the shear stress must τ c below.


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1) shear stress
2) shear stress
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