Abstract
This paper presents a strain distribution measurement near the crack tip of a dynamically fracture specimen using the Point Recognition Picture Processing System. In this system, the displacement of the points marked near the crack tip is determined by the picture processing technique. The least squure approximation of the two-dimensional distribution of displacement is obtained by using the interpolation of a finite element subdivision. From the differentiation of the displacement field, the Green's strain distribution is calculated. To fracture the specimen dynamically, an electromagnetic force is employed. As the fracture event takes only few milliseconds, pictures of the marks are taken with a high-speed camera. The results are compared with those from the static three point bending test and the dynamic loading effects on strain distribution near the crack tip are discussed.
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