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Experimental setup for measuring the elastic modulus and the longitudinal transducer coefficient of cellular ferroelectrets with a simple model for the ferroelectret (inset).
(a): Time-dependent creep and recovery of cellular polypropylene with a density of ; (b): strain vs stress for cellular polypropylene with three characteristic nonlinearity regions.
(a): Stress-dependent elastic modulus of cellular polypropylene; (b): stress-dependent longitudinal transducer coefficient of cellular polypropylene.
Strain vs stress for cellular polypropylene during repeated stress cycles showing reduced nonlinearities after prestress cycles.
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