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SUMMARY:Microstructurally-guided modeling of hard magnetorheological elast
 omers - Dr Dipayan Mukherjee\, CUED
DTSTART:20210521T130000Z
DTEND:20210521T133000Z
UID:TALK155062@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Permanently magnetizable (hard) NdFeB particle-filled magnetor
 heological elastomers (hMREs) find application in soft robotic manipulator
 s\, sensors\, etc. The hMREs are essentially two phase composites\, having
  hard magnetic inclusions in a mechanically soft matrix. Energy dissipates
  in these composites mainly due to the ferromagnetic hysteresis loss in th
 e underlying particles. In this context\, we propose a thermodynamically-c
 onsistent\, macroscopic effective model for the isotropic hMREs in terms o
 f the energetic and dissipation potentials. The proposed model has strong 
 foundations on its microstructure evolution under applied magnetic and mec
 hanical loads. Moreover\, our microstructurally-guided model is developed 
 considering a single calibration parameter\, which is computed subsequentl
 y with the aid of full-field numerical homogenization computations. \n\nTh
 e model outputs show excellent agreement with the experimental observation
 s for the deflection of a pre-magnetized soft cantilever beam. Moreover\, 
 the model predictions find a critical difference between the uniformly and
  non-uniformly pre-magnetized hMRE beams. Several propositions for the arc
 hitectured materials with a combined non-magnetic and pre-magnetized membe
 rs are made. These materials show extreme positive and negative swelling u
 nder very low actuating fields ~ 40 mT.
LOCATION:Zoom Meeting ID: 867 5602 4340
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