CFRPにおける超音波伝搬の際のエネルギー集中

抄録

When carbon fiber reinforced plastics (CFRP) is applied for actual structures, non-destructive testing should be conducted in order to detect inner defects. As one of the typical method of ultrasonic testing methods for CFRP, normal beam method, which ultrasonic wave is emitted vertically to laminates, was often used. On the other hand, since CFRP is anisotropic material, the propagation behavior of ultrasonic wave has also anisotropy. In the case of CFRP components used in actual engineering fields, there is the case that ultrasonic cannot be emitted to laminates vertically. In this case, normal beam method cannot be applied. To improve the method for detection of these defects, it is necessary to study the energy focusing of ultrasonic wave propagations on CFRP. In this study, to study this energy focusing of CFRP, numerical simulation was conducted. Finite difference method was used as the method of simulation. As the result of this simulation, when a linear source of sound is put in the model simulated as unidirectional CFRP, even if ultrasonic wave was emitted to diagonal direction against fiber direction, ultrasonic beam was focused on fiber direction.