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 enf and esf were measured near the notch root and at the smooth portion, respectively. The strain concentration factor defined by the ratio Kf=enf/esf was a constant to the inclination angle of notch, θ. However, the tendency of factor, Ke, in the elastic region for θ 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.
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