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A new electromechanical effect in which the volume electrical resistivity decreased upon tensile loading and increased upon unloading was observed in elastomer- (silicone-) matrix composites with a discontinuous and randomly oriented nickel filament filler. The effect is probably due to the increase in filament alignment upon tensile loading. It allows tensile strain sensing. However, filament - matrix interface degradation caused the resistivity to increase irreversibly and the electromechanical effect to diminish as cycling progressed beyond the first 10 - 30 cycles.
Shui et al. (Sat,) studied this question.