Electrical characteristics of composite material under loading based on SQUID technology

This paper describes the basic methods for testing the resistance of 3-D braided composite materials.The SQUID technology based test method for electromagnetic parameters of 3-D braided composite material was stud ied in accordance with material properties.The change rules of resistance and electromagnetic property of the 3-D braided composite material under d ifferent load ing cond itions were exam ined.The experimental results show that the electrical characteristics of 3-D braided composite materials are affected by manufacturing parameters and way of load ing.Resistance decreases with increasing of the thickness and fiber content and decreasing of surface braid ing angle.The resistance shows linear increase within small tensile.When the tensile is more than 6%,the resistance shows non-linear increase.Three-point bend ing has great effect on resistance,the resistance and electromagnetic field of the material under load ing is bigger than that of unload ing.