Dynamic Response of a Beam with a Crack Subjected to Four-point Impact Bending
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In an investigation on the fracture of a beam with an edge crack subjected to four-point impact bending, the dynamic behavior associated with the crack initiation, the crack propagation, the change of the dynamic stress intensity factor and others were studied by photoelastic method using the image converter camera IMACON-790. As the result, the change of the phenomenon by the influence of impact rate and the difference compared with three-point impact bending were made clear. Moreover, the dynamic stress intensity factor of a steady crack under impact loading was analysed by the Euler-Bernoulli beam theory and the validity of this theoretical calculation was confirmed by comparison with the experimental results.
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