A Detection Method for Fine Plastic Deformations of Steel using a High Performance Magnetic Gradiometer

It is important to design buildings and civil engineering structures to take into account earthquakes in Japan. When a big earthquake occurs, some structural members are damaged with present designs absorbing the energy of earthquakes. It is important when evaluating the seismic capability, to evaluate absorption capabilities of the structural members, but the nondestructive evaluation methods for absorption capabilities of structural members are not well understood.