Abstract
Arch effect arising under isostatic pressing of the cylindrical or spherical powder compacts is commonly known to cause a loosely packed interior region inside the pressings. Using the results of the shell stability theory it is shown that under definite compact's geometry and powder characteristics, arch effect can involve latent cracking of the pressing as well, with its final breakdown during green machining or sintering. Experiments using 0·6 GPa large alumina pressing revealed all the above phenomena including formation of an overpressed cylindrical layer with predicted 0·133R (R is the radius of the pressing) thickness and close packing density. It is concluded that each CIP route must be pre-calculated as for specified shape, powder and green machining in order to find CIP pressures lower than the critical shell breakdown pressure or higher than the powder's yield stress where the arch effect disappears. ©
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