While often focused on our visual system, adding touch to VR/AR environments can help render more immersive, richer user experiences. One important touch percept to render is compliance, or ‘softness.’ Herein, we evaluate the perceptibility of soft, magnetorheological elastomers (MRE) in bare-finger interactions. Such materials can be reprogrammed to distinct states of compliance. We fabricated MRE samples over elastic moduli from 23–173 kPa and measured that small 0.25 T magnetic fields increased modulus by 10–60 kPa. MRE interfaces less and more compliant than finger skin were evaluated in discrimination experiments with and without a magnetic field. The results indicate changes in modulus of 11 kPa are required to reach a 75% threshold of discrimination, although greater differences are required when an MRE’s elasticity is about the same as skin. The perceptual results with these magnetically-induced materials are similar to those with non-actuated, solid silicone-elastomers that mimic naturalistic interactions.
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Lee, Jaeyeon ; Zhang, Xiao ; Park, Chung Hyuk ; Kim, Min Jun ( , IEEE Robotics and Automation Letters)null (Ed.)
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Blodgett, Karl N. ; Fischer, Joshua L. ; Lee, Jaeyeon ; Choi, Soo Hyuk ; Zwier, Timothy S. ( , The Journal of Physical Chemistry A)