Application of carbon nanotube filled silicone rubber composite in stress measurement during ramped loading with low compression speed

To realize the stress measurement during the ramped loading with low compression speed (<1 mm/min), the piezoresistive responses of carbon nanotube filled silicone rubber composite to ramped loading are studied. If the conductive phase content of the composite is high, the piezoresistive curve is not monotonic. If the conductive phase content is low, the electrical resistance increases monotonically with the increase of the compressive stress, and the changing rate of the resistance increases with the increase of the compression speed. The phenomena are explained by analyzing the changes in the inner structure of the composite. A method to realize the conversion from the resistance of the composite to the stress during the ramped loading is proposed. The feasibility of using the piezoresistivity of the composite to measure the stress during the ramped loading with low compression speed is verified preliminarily.