複数のシェブロン状結合部を有するDCB試験片による意図したAE発生の試み

抄録

The behavior of acoustic emission (AE) generation during the tensile test of the double cantilever beam (DCB) specimens with chevron joints, which aligned along the longitudinal direction of those, was examined from the viewpoint of the reference platform for the AE method. The specimens were fabricated by the material jetting type 3-dimensional printer to have triangular-thin-columns of different sizes between the upper and the lower half of DCB. The load-displacement diagram and the characteristics of AE count during the test demonstrate that independent crack growth inducing AE occurs intermittently, and the results of AE source location show that those occur at each chevron joint. These facts imply that we can obtain expected AE signals generated within the specific region of the specimen at different timing. It was also found that both stable and unstable fractures, with low amplitude successive AE signals and high amplitude sudden AE signals, occur so that one can check the specification of instruments and engineer’s skills to measure different kinds of waveforms using the specimens. As a consequence, the specimens have the potential to act as the platform for discussing the performance of AE measurement systems.