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- 저자 : Shengpeng Zhan (검색결과 4 건)
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Shengpeng Zhan,Ruize Li,Tian Yang,Dan Jia,Jiesong Tu,Lixin Ma,Bingxue Cheng,Haitao Duan 한국고분자학회 2023 폴리머 Vol.47 No.3
The physical, chemical and mechanical properties of polymer materials used in water environment for a long time will change due to their water absorption characteristics, which will affect their tribological properties. This work studied the changes of physicochemical, mechanical, and tribological properties for five kinds of polymer materials (polyethylene, polyformaldehyde,polyamide, polytetrafluoroethylene, and poly-ether-etherketone) before and after water absorption. The mechanism of water absorption for polymer materials was revealed by molecular dynamics simulation. The results show that the higher the water absorption of polymer, the larger the swelling volume, the more the surface hardness and compressive strength decrease, and the toughness and friction coefficient of the material increase obviously. The water absorption status of polymer materials is closely related to the polarity of molecular chain. Water molecules are easy to form hydrogen bonds with polymer molecular chains of high polarity, which is the main factor of water absorption.
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Xiaoshuang Luo,Haitao Duan,Jian Li,Shengpeng Zhan,Dan Jia,Jiesong Tu,Yinhua Li,Yaping Chen 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
This study emphasizes the effect of ultrasonic surface rolling (USR) on the surface roughness, hardness, and tribologicalproperties of ductile iron under different normal loads. Results revealed that surface roughness was reduced by 96% andsurface hardness increased by 37.8% after USR treatment. By increasing normal load, the average friction coefficient of theUSR-treated specimens decreased, but the wear rate of both USR-treated and untreated specimens increased, mainly becausethe dominant wear mechanism changed. The average friction coefficient of the untreated specimen (~ 0.32) was much higherthan the USR-treated specimen (~ 0.24) when the normal load was 30 N. However, the wear rate of the USR-treated specimenwas larger than that of the untreated specimen when the normal load was greater than 20 N because the higher hardnessabrasive particles on the worn surface of the USR-treated specimen not only accelerated abrasive particle wear, but alsocaused more severe adhesive wear.
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Tribological Properties of PAO40@SiO2/UHMWPE Composites Subjected to Heavy-loading Conditions
Yao Chenyu,Jia Dan,Wan Changxin,Li Jian,Zhan Shengpeng,Yang Tian,Qi Xiaowen,Liu Changxin,Duan Haitao 한국고분자학회 2022 폴리머 Vol.46 No.5
In the present study, the ballistic impact resistance of kevlar reinforced polymer composites and shape memoryalloy sheet reinforced kevlar epoxy polymer composites have been compared numerically and experimentally. The testspecimens have been fabricated by the hand layup method, and the ballistic impact test has been conducted accordingto NIJ Level IIIA. In the current research, a new method has been proposed to measure the ballistic impact resistanceof the material by using Image J software. From the test results, it has been observed that reinforcement of shape memoryalloy in kevlar epoxy polymer composites has increased the ballistic impact resistance by 89-145% for the damaged areacompared with plain kevlar reinforced epoxy polymer composite. Also, the damaged area observed in the numerical andthe experimental results is almost the same.
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Effect of Contact Pressure on Reciprocating Wear Behavior of PEEK, PTFE, and UHMWPE
Liu Lian,Duan Haitao,Jia Dan,Tu Jiesong,Zhan Shengpeng,Li Yinhua,Luo Xiaoshuang,Zhan Wen,Xiong Wei,Li Jian 한국고분자학회 2020 폴리머 Vol.44 No.6
Engineering plastics are macromolecular compounds composed of covalently bonded macromolecules, which have been widely used in sliding wear-resistance materials in isolation bearings. In this study, an MFT-5000 reciprocating friction testing machine was used to compare the friction and wear performance of polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), and ultra-high molecular weight polyethylene (UHMWPE) under heavy load conditions in dry friction condition. The results show that load has a significant effect on the friction coefficient, wear rate, and wear mechanism of three materials. The instant friction coefficient of PTFE fluctuates under high load, the wear rate clearly increases with the increase in load. Therefore, the application under high load conditions is limited. The wear rate of UHMWPE is the least affected by the load among the three materials. Even when the load exceeds the yield strength, the wear resistance is still good. The friction coefficient of PEEK decreases with the increase in load but maintains a high value that restricts its application in sliding friction pair materials to some degree.
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