Propagation Behavior of the Stress Waves on the Strip with a Inclined Notch
Kazufumi UDA, Ichiro MAEKAWA and Yasushige KASHIWABARA
Abstract:Impact tension was applied to a PMMA (polymethylmethacrylate) strip specimen with a notch. An inclined notch was introduced by milling specimens before the experiments. The fracture strains ƒÃnf andƒÃsf were measured near the notch root and at the smooth portion, respectively. The strain concentration factor defined by the ratio Kf =ƒÃnf /ƒÃsf was a constant to the inclination angle of notch,ƒÆ. However, the tendency of factor, Ke , in the elastic region for ƒÆ was a curvy. The factor Ke of the short specimen was larger than that of the long one. Numerical analysis showed similar results. The impact strength of the strip with a notch could be estimated by the simple strain rate near the notch root. Key Words:Strip with a notch, Impact tension, Dynamic strain, Stress concentration, Stress wave, Dynamical elastic-plastic analysis