Abstract
The fracture patterns produced by concentrated impact loading on brittle beams and their dependence on the impact velocity and beam length has been determined. The experiment was performed using the transverse impact of a steel ball on the free end of cantilever beams made of plaster. The mechanism, location and time sequence of fracture were photographed by a camera connected to a stroboscope or with a high-speed framing camera. It was found experimentally that the concentrated impact loadings produce three characteristic fracture behaviors. Moreover, by using the dynamic photoelastic technique, the authors found it possible to explain theoretically the fracture behavior of this experiment by using the theory of flexural motion of a semi-infinite beam. Hence, applying an impact-fracture criterion to this theory, the fracture patterns of brittle beam can be estimated.
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