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Alfazazi Dourfaye - One of the best experts on this subject based on the ideXlab platform.
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Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 1 - WC-Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC-Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m · s- 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC-Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC-Co/alumina contact.
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Wear mechanisms of WC–Co drill bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.
Malik Yahiaoui - One of the best experts on this subject based on the ideXlab platform.
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Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 1 - WC-Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC-Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m · s- 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC-Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC-Co/alumina contact.
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Wear mechanisms of WC–Co drill bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.
J Y Paris - One of the best experts on this subject based on the ideXlab platform.
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Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 1 - WC-Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC-Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m · s- 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC-Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC-Co/alumina contact.
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Wear mechanisms of WC–Co drill bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.
Jean Denape - One of the best experts on this subject based on the ideXlab platform.
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Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 1 - WC-Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC-Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m · s- 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC-Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC-Co/alumina contact.
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Wear mechanisms of WC–Co drill bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
International Journal of Refractory Metals and Hard Materials, 2015Co-Authors: Malik Yahiaoui, J Y Paris, Jean Denape, Alfazazi DourfayeAbstract:The tribological behavior of commercial roller cone bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.
Mujika Faustino - One of the best experts on this subject based on the ideXlab platform.
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Laminarteko hausturaren i/ii modu mistoa aztertzeko saiakuntza konfigurazio berri bat
Euskal Herriko Unibertsitatea, 2018Co-Authors: Boyano Ana, Osa, Juan Luis, Fernandez-gamiz Unai, Torre Leyre, Mujika FaustinoAbstract:This study describes a new test configuration, based on an End Notched Flexure test configuration. A metallic roller is inserted between the two arms of the crack in order to get aa mixed mode fracture. The external load application gives the mode II, and the opening of the crack is get by means of the inserted roller. Energy release rate is the parameter used for analyzing interlaminar fractura. Each mode energy release rate is determined analytically and the results are compared with the ones obtained by finite element method. Experimental tests are performed with specimens of F593/T300 carbon/epoxy unidirectional composite. The procedure to determine crack length is checked, energy release rate curves are determined and a failure criterion is validated. Moreover, the values of GIc and GIIc are determined.Lan honetan, laminatu konpositeen I/II haustura modu mistoa aztertzeko, saiakuntza konfigurazio berri bat aurkezten da. Konfigurazioa End Notched Flexuresaiakuntzan oinarrituta dago. Pitzaduraren bi besoen artean, metalezko arrabola bat sartzen da modu mistoa lortzearren. II modua kanpoko kargaren bidez lortzen da, eta I modua, arrabola bat sartuz pitzadura irekitzean lortzen da. Haustura aztertzeko, energia askatzearen tasa erabiltzen da. Haustura modu bakoitzari dagokion tasa, analitikoki kalkulatu ondoren, elementu finituen bidezko kalkuluetan lortutako emaitzekin erkatzen da. Lan esperimentalean, karbono zuntzez eta epoxi matrizez osatutako norabide bakarreko T300/F593 konpositea erabiltzen da. Pitzadura luzera egoki neurtuta dagoen egiaztatzen da, energia askatzearen tasaren balioak irudikatzen dira, eta haustura irizpide egokia aukeratu da. Gainera, GIc eta GIIc parametroak ere kalkulatzen dira
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Laminarteko hausturaren I/II modu mistoa aztertzeko saiakuntza konfigurazio berri bat
'UPV EHU Press', 2018Co-Authors: Boyano Murillo, Ana Isabel, Osa, Juan Luis, Fernandez-gamiz Unai, Torre Leyre, Mujika FaustinoAbstract:This study describes a new test configuration, based on an End Notched Flexure test configuration. A metallic roller is inserted between the two arms of the crack in order to get a mixed mode fracture. The external load application gives the mode II, and the opening of the crack is get by means of the inserted roller. Energy re-lease rate is the parameter used for analyzing interlaminar fracture. Each mode energy release rate is determined analytically and the results are compared with the ones obtained by finite element method. Experimental tests are performed with specimens of F593/T300 carbon/epoxy unidirectional composite. The procedure to determine crack length is checked, energy release rate curves are determined and a failure criterion is validated. Moreover, the values of GIc and GIIc are determined.; Lan honetan, laminatu konpositeen I/II haustura modu mistoa aztertzeko, saiakuntza konfigurazio berri bat aurkezten da. Konfigurazioa End Notched Flexuresaiakuntzan oinarrituta dago. Pitzaduraren bi besoen artean, metalezko arrabola bat sartzen da modu mistoa lortzearren. II modua kanpoko kargaren bidez lortzen da, eta I modua, arrabola bat sartuz pitzadura irekitzean lortzen da. Haustura aztertzeko, ener-gia askatzearen tasa erabiltzen da. Haustura modu bakoitzari dagokion tasa, analitikoki kalkulatu ondoren, elementu finituen bidezko kalkuluetan lortutako emaitzekin erka-tzen da. Lan esperimentalean, karbono zuntzez eta epoxi matrizez osatutako norabide bakarreko T300/F593 konpositea erabiltzen da. Pitzadura luzera egoki neurtuta dagoen egiaztatzen da, energia askatzearen tasaren balioak irudikatzen dira, eta haustura iriz-pide egokia aukeratu da. Gainera, GIc eta GIIc parametroak ere kalkulatzen dira
