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首頁> 美國衛(wèi)生研究院文獻(xiàn)>Materials >Effects of Silicone Oil Viscosity and Carbonyl Iron Particle Weight Fraction and Size on Yield Stress for Magnetorheological Grease Based on a New Preparation Technique
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Effects of Silicone Oil Viscosity and Carbonyl Iron Particle Weight Fraction and Size on Yield Stress for Magnetorheological Grease Based on a New Preparation Technique

機(jī)譯：基于一種新制備技術(shù)的硅油粘度和羰基鐵的粒徑分?jǐn)?shù)及尺寸對(duì)磁流變潤滑脂屈服應(yīng)力的影響

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This paper investigated the effects of silicone oil viscosity (SOV) and carbonyl iron particle (CIP) weight fraction and size on dynamic yield stress for magnetorheological (MR) grease. The MR grease samples were prepared using orthogonal array L9 on the basis of a new preparation technology. The shear rheological tests were undertaken using a rotational shear rheometer and yield stress was obtained based on the Bingham fluid model. It was found that CIP fractions ranging from 65 wt% to 75 wt% and SOV varying from 50 m2·s−1 to 1000 m2·s−1 significantly affect the magnetic field-dependent yield stress of MR grease, but the CIPs with sizes of 3.2–3.9 μm hardly had any influence based on the analysis of variance (ANOVA). In addition, the yield stress of MR grease mainly depended on the CIP fraction and SOV by comparing their percent contribution (PC). It was further confirmed that there were positive effects of CIP fraction and SOV on yield stress through response surface analysis (RSA). The results showed a high dynamic yield stress. It indicated that MR grease is an intelligent material candidate which can be applied to many different areas requiring high field-induced rheological capabilities without flow for suspension. Moreover, based upon the multivariate regression equation, a constitutive model was developed to express the function of the yield stress as the SOV and fraction of CIPs under the application of magnetic fields.
機(jī)譯：本文研究了硅油粘度（SOV）和羰基鐵顆粒（CIP）的重量分?jǐn)?shù)和大小對(duì)磁流變（MR）潤滑脂動(dòng)態(tài)屈服應(yīng)力的影響。在新的制備技術(shù)的基礎(chǔ)上，使用正交陣列L9制備了MR潤滑脂樣品。使用旋轉(zhuǎn)剪切流變儀進(jìn)行剪切流變測(cè)試，并基于賓厄姆流體模型獲得屈服應(yīng)力。發(fā)現(xiàn)CIP分?jǐn)?shù)在65 wt％至75 wt％之間，SOV在50 m 2 ·s -1 至1000 m 2 ·s ?1 會(huì)顯著影響MR潤滑脂的磁場依賴性屈服應(yīng)力，但是基于方差分析（ANOVA），尺寸為3.2–3.9μm的CIP幾乎沒有任何影響。此外，通過比較其百分比貢獻(xiàn)率（PC），MR潤滑脂的屈服應(yīng)力主要取決于CIP分?jǐn)?shù)和SOV。通過響應(yīng)表面分析（RSA），進(jìn)一步證實(shí)了CIP分?jǐn)?shù)和SOV對(duì)屈服應(yīng)力有積極影響。結(jié)果顯示出高的動(dòng)態(tài)屈服應(yīng)力。這表明MR潤滑脂是一種明智的材料候選物，可以應(yīng)用于許多需要高場致流變能力而無需懸浮液的領(lǐng)域。此外，基于多元回歸方程，建立了一個(gè)本構(gòu)模型，以表達(dá)屈服應(yīng)力作為SOV和CIPs在磁場作用下的分?jǐn)?shù)的函數(shù)。

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