Experimental study on pure-shear-like cyclic deformation of VHB 4910 dielectric elastomer
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The cyclic deformation of VHB 4910 dielectric elastomer is experimentally investigated by performing a series of strain-controlled and stress-controlled pure-shear-like cyclic tests at room temperature. In the strain-controlled cyclic tests, obvious Mullins effect is observed in the first cycle, and continuous stress softening is characterized in the subsequent cycles; the Mullins effect and continuous stress softening are intensified by prescribing larger peak strains and higher strain rates. In the stress-controlled cyclic tests, remarkable ratchetting takes place, and its evolution becomes more significant if higher stress levels, lower stress rates and longer hold time at peak stress are prescribed. Moreover, a partial recovery of residual strain indicates that, besides obvious hyper-elasticity, the VHB 4910 dielectric elastomer also exhibits both recoverable viscoelasticity and measurable irrecoverable visco-plasticity during the cyclic tests.
KeywordsDielectric elastomer Cyclic deformation Time-dependence Stress softening Ratchetting
This work is financially supported by National Natural Science Foundation of China (11272269 and 11572265), the Opening Project of Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, China (SZDLH-1702) and Doctoral Innovation Fund Program of Southwest Jiaotong University (D-CX201837).
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