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By C.E. CAPES (Eds.)
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Sample text
The diametral compression test is o n e form of indirect tension test which has been applied t o pharmaceutical tablets [ 2 3 ] . In this test, a thin wafer of c o m p a c t is compressed diametrically b e t w e e n t w o flat platens. There exists across the loaded diameter a tensile principal stress of c o n s t a n t magnitude which tends t o pull the wafer in half along this line. The magni tude of the stress is given by: op where σ is the tensile stress, Ρ is the applied load, D is the wafer diameter, and t is the thickness of the s p e c i m e n .
Amer. Inst. , 2 4 1 ( 1 9 6 8 ) 4 7 5 — 4 8 1 . C. W. Fuerstenau, Dry strength of pelletized spheres, J. A m . Ceram. S o c , 50 ( 1 9 6 7 ) 1 4 - 1 8 . F. Ball, J. Dartnell, J. Davison, A. Grieve and R. Wild, Agglomeration of Iron Ores, Heinemann, London, 1 9 7 3 . S. Wakeman, Method for evaluation of data from the batch testing of green pellets. Trans. Amer. Inst. , 2 5 2 ( 1 9 7 2 ) 83—86. T. O. Williams and A. Grieve, S o m e problems in the pellet hardening of iron ores and concentrates, Proc.
This representation was origi nally conceived by R u m p f [ 1 ] based mainly on theoretical calculations. The inclined solid lines s h o w the limits of tensile strength produced by the me dium strength capillary and interfacial forces. The region b e l o w this refers t o the relatively weak intermolecular and long range forces and forces due t o adsorbed liquid films. The third region consists of the m u c h stronger bond ing d u e t o the various mechanisms of solid bridging. As R u m p f has n o t e d , t h e bonding strengths in this upper region are less d e p e n d e n t o n particle size.