Microstructurally-guided modeling of hard magnetorheological elastomers

Add to your list(s) Download to your calendar using vCal

• Dr Dipayan Mukherjee, CUED
• Friday 21 May 2021, 14:00-14:30
• Zoom Meeting ID: 867 5602 4340.

If you have a question about this talk, please contact Hilde Hambro.

email hh463@cam.ac.uk for passcode

Permanently magnetizable (hard) NdFeB particle-filled magnetorheological elastomers (hMREs) find application in soft robotic manipulators, 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 the underlying particles. In this context, we propose a thermodynamically-consistent, macroscopic effective model for the isotropic hMREs in terms of the energetic and dissipation potentials. The proposed model has strong foundations on its microstructure evolution under applied magnetic and mechanical loads. Moreover, our microstructurally-guided model is developed considering a single calibration parameter, which is computed subsequently with the aid of full-field numerical homogenization computations.

The model outputs show excellent agreement with the experimental observations 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 architectured materials with a combined non-magnetic and pre-magnetized members are made. These materials show extreme positive and negative swelling under very low actuating fields ~ 40 mT.

This talk is part of the Engineering - Mechanics and Materials Seminar Series series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Cambridge University Engineering Department Talks
• Cambridge talks
• Centre for Smart Infrastructure & Construction
• Computational Continuum Mechanics Group Seminars
• Engineering - Mechanics and Materials Seminar Series
• Engineering - Mechanics, Materials and Design (Div C) - talks and events
• Featured lists
• Interested Talks
• Lennard-Jones Centre external
• School of Technology
• Trust & Technology Initiative - interesting events
• Zoom Meeting ID: 867 5602 4340
• bld31

Note that ex-directory lists are not shown.