Deformation Behaviour of Materials Caused by Quasi-Static and Dynamic Indentation of a Spherical Particle

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Analyses of plastic strain caused by a quasi-static or dynamic intrusion of a hard steel ball were carried out to consider fundamental mechanisms of erosion by solid particle impact. Regular square grids with a pitch of 80μm were printed on the cross-sectional surface of two pieces of the specimens by using a photoengraving method. The specimens were tightly vised with two pairs of bolts and nuts, then indentation tests were conducted at the parting line at angles of 30, 60 and 90 degrees. Principal shearing strain distributions on the corss sectional surface around indentations were obtained for commercially pure aluminium and iron. It was found that both the type of materials and intrusion processes affected the strain distribution behaviour. The elasto-plastic boundary on the cross sectional surfaces and lip height on the surfaces, also studied in this paper, showed a good correlation to the results of principal shearing strain distributions. A finite element method was carried out to simulate plastic strain distributions under the same conditions of the quasi-static indentation test. The experimental and computated results suggested that the strain accumulation beneath the indentation is not an incitement to erosion damage.
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