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Discussion on shear properties and flow model in screw tightening lubricant PIB under low sliding speed conditions
Tribology International ( IF 6.2 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.triboint.2020.106474
Takefumi Otsu , Kyoichi Komatsu , Shinji Hashimura

Abstract This paper describes that shear properties and flow model in screw tightening lubricant PIB under low sliding conditions was investigated in order to understand the detail of lubrication condition on screw tightening surfaces. In this study, the sliding speed simulated in practical cases using M8 – M12 bolts were applied. The test results indicated that in the full-starvation condition, the film thickness that greater than the surface roughness of specimens was measured even in low speed cases, and the shear stress in the film was constant in all the conditions. It was also demonstrated from observation results by high speed camera that the PIB film moved to the sliding direction at the sliding speed, and that the film profile was almost same throughout the test duration. These results suggest that the PIB film transitioned to solidified film on the contact area, and that the wall-slip flow model was applied to the present conditions. Furthermore, the behaviors of friction coefficient and preventing wear obtained in this study almost corresponded to the results in our previous tightening test.

中文翻译:

低滑动速度条件下螺钉紧固润滑剂PIB的剪切特性及流动模型探讨

摘要 本文研究了低滑动条件下螺丝紧固润滑剂PIB的剪切特性和流动模型,以了解螺丝紧固表面润滑条件的细节。在这项研究中,应用了使用 M8-M12 螺栓在实际情况下模拟的滑动速度。测试结果表明,在完全饥饿条件下,即使在低速情况下也能测得大于试样表面粗糙度的膜厚,并且膜中的剪切应力在所有条件下都是恒定的。高速相机的观察结果也表明,PIB薄膜以滑动速度向滑动方向移动,并且在整个测试过程中薄膜轮廓几乎相同。这些结果表明 PIB 膜在接触区域转变为固化膜,并且壁滑流模型适用于当前条件。此外,本研究中获得的摩擦系数和防止磨损行为几乎与我们之前的拧紧测试结果一致。
更新日期:2020-11-01
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