Ductile fracture model in the shearing process of zircaloy sheet for nuclear fuel spacer grids |
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Authors: | Jaeyoon Wang Naksoo Kim Hyungyil Lee |
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Affiliation: | 1.Department of Mechanical Engineering,Sogang University,Seoul,Korea |
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Abstract: | Features of sheared edges are predicted based on material properties of Zircaloy obtained from the tensile test and ductile
fracture model such as the Gurson-Tvergaard-Needleman (GTN) and Johnson-Cook models. The sheared edges formations are numerically
analyzed in each ductile model. An appropriate ductile fracture model is selected to study the relative depth of sheared edges
with respect to process parameters. The tendency of failure parameters that are affected by sheared edges and fracture duration
is investigated. We applied changes on parameters of failure models to show that the punch force curve and the ratio of characteristic
lengths could be coincided, which led us to conclude that the GTN and Johnson-Cook models are equivalent. In the Johnson-Cook
model, however, the characteristic length of the sheared edges does not change as each failure parameter reaches a critical
value. Hence, the FE prediction model for forming defects is developed using the GTN failure model. Finally, the characteristic
length of sheared edges have been measured using the FE prediction model for shearing process parameters such as punch velocities,
clearance, and tool wear. Our results showed that the punch-die clearance is the most significant factor that affects forming
defects when compared to other factors. |
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Keywords: | |
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