To explore the relationship between grinding and abrasive wear, a range of differing experiments has been performed. These include simple wear tests, dynamometer measurements of grinding forces, simple scratch tests with both idealized indentors and abrasive grits, and the microscopic examination of abrasive wheels and worn surfaces of steel. It is suggested that grinding and abrasive wear should be regarded as essentially similar mechanisms. The anomalies which occur with heat-treated steels, of a range of hardness, in both grinding and abrasive wear may be attributable to the influence of ploughing which affects the efficiency of the action of individual grits.
A 2.54cn d i a m e t e r punch and d i e s e t h a s been used i n c o n j u n c t i o n w i t h a Mayes H y d r a u l i c l l a c h i n e t o e x m i n e s t r a i n movements w i t h i n t h e d i e o f c o c p a c t s n a i n t a i n e d a t c o n s t a n t s t r e s s . These were p r e p a r e d from t h e b a s e s A v i c e l PH 101 ( A V ) , Sta-Rx 1500 ( S T ) , P a r a c e t a m l DC ( P C ) , Emdex (ED) and Encor?press (EC). Compression f o r c e and punch n o v e r e n t s were s i c u l t a n e o u s l y monitored u s i n g a CBH n i c r o c o u p u t e r w i t h d i s k s t o r a g e o f d a t a . A l l compacts shoL-ed t i n e dependent c o n s o l i d a t i o n under c0nstar.t s t r e s s when h e l d a t ' h o l d i n g t i n e ' 0 2 up t o 60s. PC, AV and ST "Lo..7enrr'is b u t -I--* -c 7.7-9 --I L : i c i ui -., ..&..-I cc :.;ere I G Z 2 . ex!. ?!. i t e i ci."-...p alaL1 L . . I " E l a s t i c r e c o v e r y on sudden r e l e a s e o f l o a d w a s followed u s i n g machine code l o g g i n g o v e r a p e r i o d o f 90ms. Large r e c o v e r i e s were r e c o r d e d f o r AV, PC and ST. I f l o a d r e l e a s e was i m e d i a t e ( z e r o h o l d i n g t i m e ) t h e n t h e r e c o v e r y was g r e a t e r when c o r p a r e d w i t h r e c o v e r y a f t e r h o l d i n g tir,es of 30 and 6 0 s , s u g g e , s t i n g t h a t some e l a s t i c e n e r g y was d i s s i p a t e d d u r i n g t h e h o l d i n g t i m e . E l a s t i c r e c o v e r y o f E D 2nd E C was about h a l f t h a t o f rile o t h e r b a s e s . Although t h e s e b a s e s a l s o showed reduced r e c o v e r y w i t h h o l d i n g t i n e , p e r c e n t a g e r e d u c t i o n was s n a l l e r than f o r t h e o t h e r b a s e s . 139 Drug Dev Ind Pharm Downloaded from informahealthcare.com by McMaster University on 02/03/15For personal use only.
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