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An alternative explanation of forming force reduction for forming process submitted to vibration: Influence of the waveform in the viscoplastic domain

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Figure

Fig. 2. Equilibrium of a slab.
Fig. 4. Average value of the normalized forging load ¯ G as function of coefficient m.
Fig. 6. Displacement triangular waveform with duty ratio ˛.
Fig. 9. Schematic of the model used in FORGE 2008: the upper die is moving and the lower die is fixed
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