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SUMMARY:Use of raman spectroscopy to study fatigue type processes in polyc
 rystalline diamond (PCD)
DTSTART;VALUE=DATE-TIME:20110713T150000Z
DTEND;VALUE=DATE-TIME:20110713T170000Z
DTSTAMP;VALUE=DATE-TIME:20260811T235911Z
UID:indico-contribution-5079@events.saip.org.za
DESCRIPTION:Speakers: Maxwell Vhareta (University of the Witwatersrand)\nP
 olycrystalline diamond (PCD) cylindrical cutters used in oil well drilling
  are susceptible to fracture due to the hostile environment of randomly oc
 curring high impact loads. These cutters commonly consist of a PCD layer s
 intered onto a cobalt-tungsten carbide (Co-WC) substrate. The fact that th
 e cutters fail after repeated use gives rise to the possibility of fatigue
  type processes in diamond. The study of stress fields and their relative 
 geometries thus become crucial in the quest to have extended lives for the
 se cutters. Since the diamond Raman line reveals both the nature and magni
 tude of the stress present in the material this technique was employed in 
 this work. Room temperature measurements show a general compressive stress
  field on the PCD before being fatigued using a ball on three balls test r
 ig and it then gradually deteriorates to a residual tensile stress field. 
 Whereas a general compressive stress is desirable in the PCD layer as it i
 nhibits the propagation of cracks\, on the contrary tensile stresses facil
 itate formation of cracks leading to catastrophic failure of the cutters.\
 n\nhttps://events.saip.org.za/event/7/contributions/5079/
LOCATION: Asteria
URL:https://events.saip.org.za/event/7/contributions/5079/
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