Читать книгу The Rheology Handbook - Thomas Mezger - Страница 82

A filled elastomer showed shear-thinning behavior at T = +80 °C across the whole shear rate range of γ ̇ = 0 to 100 s-1. At T = +40 °C it first indicated shear-thinning, followed by shear-

thickening when exceeding γ ̇ = 50 s-1. At T = +23 °C finally, already at around γ ̇ = 10 s-1 pronounced shear-thickening was occurring. Possible reason: At low temperatures, shear-induced or flow- induced crystallization can be expected for this material. A result of this is shear thickening and hardening, [3.16]. See also Chapter 9.2.2: Shear-induced effects.

Note 4: Composite materials as a “dilatant switch”

Shear-thickening fluids (STF) were developed with the aim of immediate thickening as soon as a defined limiting value of loading is exceeded.