Transient Stress Response of Magnetorheological (MR) Materials

磁流变 (MR) 材料的瞬态应力响应

• 批准号: 9817578
• 负责人: Pradeep Fulay
• 金额: $ 15万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9817578&HistoricalAwards=false
• 关键词: Transient; Stress; Response; Magnetorheological; MR

9817578Magnetorheological (MR) materials consist of dispersions of micrometersized particulates of magnetically soft materials in organic liquids. Whenan external magnetic field is applied, the polarized magnetic particlesform "pearl chains" constituting a fibrillated structure that exhibits arespectable "yield stress" (~ up to 100 kPa). MR fluids represent atechnology enabling and intellectually engaging family of smart, fieldcontrollable materials. MR fluids can enable many technologies for activevibration control. Applications include shock absorbers, smart bridges, anddampers for high rise buildings for protection against seismic activity.The goal of the proposed program is to carefully investigate theapplication relevant, dynamic mechanical properties of MR materials with aview to elucidate the mechanics and also the mechanisms underlying MRmaterials. We will elucidate the transient stress response of MR fluids inswitching magnetic fields. Our collaborations with industry will be usefulin transferring our research outcomes to the industry.

9817578磁流变（MR）材料由软磁材料的微米级颗粒在有机液体中的分散体组成。当外加磁场时，极化的磁性颗粒形成“珍珠链”，构成具有相当大的“屈服应力”（~高达100 kPa）的原纤化结构。磁流变液代表了一种技术，使和智能参与家庭的智能，现场可控材料。磁流变液可以使许多技术的主动振动控制。应用包括减震器，智能桥梁和高层建筑的减震器，以防止地震activity. Goal提出的计划是仔细研究应用相关的，动态的MR材料的力学性能，以期阐明力学和MR材料的机制。我们将阐明磁流变液在开关磁场中的瞬态应力响应。我们与工业界的合作将有助于将我们的研究成果转移到工业界。