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Harmonic analysis in, grease rheology

机译：润滑脂流变学中的谐波分析

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Yield stress, and small- and large-amplitude oscillatory shear measurements were performed on greases in a cone-plate fixture. Below the yield point, the grease behavior mimics that of a lightly crosslinked polymer. In large-amplitude oscillations that exceed the yield stress, harmonic distortion appears in the stress waveform. The elastic component of the stress is continuous across the transition, while the viscous, or out-of-phase component, is a transient stress that occurs in the high shear rate portion of each oscillation cycle. Our newly proposed viscous slip model accurately reproduces the measured stress waveform for greases, as well as for other yield stress materials. From measured harmonic amplitudes, this model provides the strain amplitude dependence of the elastic modulus and the equivalent of a dynamic yield stress. These properties of channeling grease complement the conventional measurements of yield stress and worked and unworked penetration. (C) 2003 Wiley Periodicals, Inc. [References: 18]
机译：在锥板夹具中对油脂进行了屈服应力以及小振幅和大振幅振荡剪切测量。在屈服点以下，润滑脂的行为类似于轻度交联的聚合物。在超过屈服应力的大振幅振荡中，应力波形中会出现谐波失真。应力的弹性分量在过渡过程中是连续的，而粘性或异相分量是在每个振荡周期的高剪切速率部分中发生的瞬态应力。我们新近提出的粘性滑移模型可精确再现润滑脂以及其他屈服应力材料的测量应力波形。根据测得的谐波振幅，该模型提供了弹性模量的应变振幅依赖性以及动态屈服应力的等效性。通道润滑脂的这些特性补充了屈服应力以及加工和未加工渗透的常规测量方法。 （C）2003 Wiley Periodicals，Inc. [参考：18]

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