電磁誘導による小形衝撃体の衝突時の衝撃荷重の測定方法

抄録

　　　In the research, measuring method of impact load and impact load-deflection curve of a target specimen when a small impactor collided was proposed by using multiple coils on the basis of Faraday’s law of electromagnetic induction. The electromotive forces generated in the multiple coils with gradual increasing turns at different positions near the specimen when the impactor with an embedded magnet passed through the coils were summed to increase intensity of the electromotive force and extend measureable distance. The relation between the impactor velocity and the summed electromotive force was used as reference data to calculate the displacement, velocity and acceleration of the impactor. Furthermore, the impact load was also calculated from the acceleration and mass of the impactor. The penetration tests of a rubber plate were conducted by using the impactors with different tip shapes and three coils. Penetration or rebound of the impactor were identified from history of the impactor velocity. Measuring impact loads and impact load-deflection curves of the rubber plate were available through the use of the method even though the impactors were small.