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Spheroidal graphite cast iron has excellent strength and elongation and has been used as suspension parts for automobiles or construction machineries. But cast iron that used as parts in buildings, the material can't bear the tensile stress and shear stress. In this study, we evaluated the fracture toughness of sheroidal graphite cast iron by the charpy impact test and 3-point bending fracture toughness test. We calculate the Ji value and crack-tip opening displacement. We analyze the maximum load of the perforated plate on nonlinear fracture mechanics, and evaluate the accuracy of analysis value by tensile test of perforated plate.

FRACTURE TOUGHNESS OF SHEROIDAL GRAPHITE CAST IRON AND ESTIMATE MAXIMUM LOAD OF PERFORATED PLATE