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46. Bending Fretting Fatigue Characteristics of 18CrNiMo7-6 Alloy Steel

Author

SHEN Yan-tuan, PENG Jin-fang, XU Zhi-biao, LIU Jian-hua, CAI Zhen-bing, and ZHU Min-hao

Subjects
bending fretting fatigue, fretting damage, fatigue life, crack propagation, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

A series of bending fretting fatigue tests of 18CrNiMo7-6 alloy steel were carried out, the bending fretting fatigue S-N curve was built up, and an analysis was made on the test results. The results show that, the S-N curve of 18CrNiMo7-6 alloy steel presents a shape of "ε" curve, which is different from the medium carbon steel, and also different from the plain bending fatigue. With the increase of the bending fatigue stress, the fretting regime transforms from partial slip regime to mixed regime and slip regime. The wear mechanisms of fretting damage zones mainly are delaminated, abrasive wear and oxidative wear. In the mixed regime, the cracks are easy to initiate and propagate, and the cracks all originate from the subsurface of contact zone. Due to the different influence levels of the contact stress and bending fatigue stress, the initiation and propagation of the bending fretting fatigue cracks can be divided into three stages. Firstly, the cracks initiate from subsurface under the control of contact stress; then propagate to a larger angle direction under the joint control of contact stress and bending fatigue stress; lastly the cracks propagate vertically to contact surface until fracture failure under the control of bending fatigue stress.

Published
2017
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47. Effect of Graphene Oxide on Anti-aging Property of Nitrile Butadiene Rubber

Author

ZHANG Lin, CHEN Duo-li, ZHU Min-hao, CAI Zhen-bing, and PENG Jin-fang

Subjects
nitrile butadiene rubber, damping material, graphene oxide, damping property, anti-aging property, microstructure, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

The blends with higher damping performance was prepared based on nitrile butadiene rubber(NBR) with addition of graphene oxide(GO) and modified graphene oxide(MGO) prepared by improved Hammer method. Meanwhile, the damping property and the anti-aging property of the blends were investigated by DMA, AFM, SEM and so forth. The results show that after the addition of the GO and MGO, the tangent of loss angle(tanδ) increases and also the anti-aging property is improved. When adding less amount of GO in the matrix, the anti-aging property is better; when adding MGO in the matrix, the amount of addition is not obviously related with the anti-aging property of the blends. The dispersion of GO and MGO has positive correlation with its anti-aging property. By microscopic analysis, the main reason for the decrease of anti-aging property of the blends is the agglomeration of the GO. The interface effect formed by the addition of MGO and GO is the main reason for its high damping property and anti-aging property.

Published
2017
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