Effect of Shape of Sand Grains on Wear of Nitrile Butadiene Rubber in Crude Oil with Sand and their Mechanical Behavior

doi:10.11901/1005.3093.2016.668

Chinese Journal of Materials Research

2018, Vol. 32

Issue (1): 65-72 DOI: 10.11901/1005.3093.2016.668

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Effect of Shape of Sand Grains on Wear of Nitrile Butadiene Rubber in Crude Oil with Sand and their Mechanical Behavior

Xiaoren LV¹(

), Jichi CHEN², Heting QIAO¹, Shijie WANG¹

1 School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
2 School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China;

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Xiaoren LV, Jichi CHEN, Heting QIAO, Shijie WANG. Effect of Shape of Sand Grains on Wear of Nitrile Butadiene Rubber in Crude Oil with Sand and their Mechanical Behavior. Chinese Journal of Materials Research, 2018, 32(1): 65-72.

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Abstract

Friction and wear behavior of nitrile butadiene rubber in crude oil with sand was investigated by the reciprocating wear tester, while the movement of sand grains of different shapes during the wear process was also studied. Morphology and chemical composition of the worn surface of rubber were characterized by stereo microscope and field emission scanning electron microscope. The results show that the frictional coefficient and wear loss of the rubber in crude oil increased with the addition of sand. The main movement model of round-shaped sand grains was rolling within the desired range of load, and the grinding abrasive wear was generated on the rubber surface. The movement model of sharp sand grains changed from rolling to sliding when the applied load was above 95 N, and correspondingly the wear mechanism of rubber transformed into cutting abrasive wear. The above observed variation of movement model of different shaped sand grains by varying applied load and its effect on the wear mechanism of rubber was further confirmed by the research result on the mechanical behavior related with translational acceleration and rotational acceleration of sand grains.

Key words: inorganic non-metallic materials abrasive wear nitrile rubber sand mechanical behavior crude oil

Received: 05 December 2016

ZTFLH:

TH117

Fund: Supported by National Natural Science Foundation of China (No. 50875178), Liaoning BaiQianWan Talents Program (No. 2015(48)), Outstanding Young Scholars Growth Plan of Colleges and Universities in Liaoning Province (No. LJQ2015080)

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Fig.1 Morphology of round (a) and sharp (b) sand

Fig.2 Schematic diagram of experimental apparatus

Fig.3 Variation of frictional coefficient of NBR with load under the condition of crude oil containing sand

Fig.4 Variation of wear loss of NBR with load under condition of crude oil containing sand

Fig.5 Stereoscopic morphologies of worn surface of NBR in crude oil with sand (a) sharp sand, 20 N (b) round sand, 20 N (c) sharp sand, 55 N (d) round sand, 55 N (e) sharp sand, 95 N (f) round sand, 95 N (g) sharp sand, 155 N (h) round sand, 155 N

Fig.6 SEM morphologies of worn surface of NBR in crude oil with sand (a) sharp sand, 20 N (b) round sand, 20 N (c) sharp sand, 55 N (d) round sand, 55 N

Table 1 Relative C element percentage content on NBR surface before and after the wear experiment

Fig.7 Variation in indentation depth of metal ring with the load on NBR rubber surface

Fig.8 Geometric model of mechanical analysis of sharp sand (a) contact schematic diagram (b) force schematic diagram (c) simplified force schematic diagram

Fig.9 Contact schematic diagram of sharp sand of contact

Fig.10 Geometric model of mechanical analysis of round sand (a) contact schematic diagram (b) force schematic diagram (c) simplified force schematic diagram

Fig.11 Variation in ratio of sliding acceleration and rolling acceleration with load of sand (a) Sharp sand (b) Round sand

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