| MIN Qiang-qiang,TANG Xue-feng,ZHOU Qing-hua.Adhesive Contact Mechanical Behaviors of the Textured Coating Surface[J],51(6):194-203 |
| Adhesive Contact Mechanical Behaviors of the Textured Coating Surface |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.06.016 |
| KeyWord:textured coating contact mechanics Van der Waals forces adhesive contact |
| Author | Institution |
| MIN Qiang-qiang |
School of Aeronautics & Astronautics, Sichuan University, Chengdu , China |
| TANG Xue-feng |
School of Aeronautics & Astronautics, Sichuan University, Chengdu , China |
| ZHOU Qing-hua |
School of Aeronautics & Astronautics, Sichuan University, Chengdu , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Dry adhesion is demonstrated as one of the best ways to realize attachment on space irregular objects and space cruise, as a result of its reliable adhesive ability when exposed to the vacuum and high or low-temperature atmosphere, and its unnecessity of chemical medium or electromagnetic filed. Traditional measures, including coating and texture technique, are utilized to realize higher adhesive force, however, interface high adhesion and mechanical reliability are difficult to realize at the same time. Hence, a new method named textured coating technique trying to process textures on the coating is proposed in this paper such that the interface comprehensive mechanical properties can meet the requirements. Furthermore, a new numerical adhesive contact model of textured coating surface was established to explore the influence of the textured coating on the adhesive mechanical properties of micro contact pairs. The results can be utilized to help instruct the design of the proposed textured coating technique. Based on the Hamaker summation method and Lennard-Jones potential law, the adhesion contact model of textured coating surface was constructed by considering the effects of textures height on the approach distribution between two contact bodies and the effects of coating and texture properties on the adhesive force. The model was validated with the numerical results from existing literature. Based on the proposed model, the effects of texture types, texture density, texture height, and coating thickness on the adhesive properties under two typical Tabor parameters are investigated. The influences of different materials represented by two kinds of Tabor parameters on the adhesive force are revealed. Three different kinds of textures, including ellipsoid-shaped texture, pyramid-shaped texture and cylinder-shaped texture are selected to explore the effects of texture types on adhesive behaviors. Results showed that cylinder-shaped texture corresponds to the biggest pull-off force, followed by ellipsoid-shaped texture and pyramid-shaped texture under the same conditions. When the texture density increases from 200 μm‒2 to 4 000 μm‒2, the pull-off force of three kinds of textures increases gradually. Cylinder-shaped texture increases by about 5~6 times and pyramid-shaped texture increases by about 1.5 times of the original. With the increase of texture height from 1εbs to 30εbs, the pull-off forces of three kinds of texture decrease gradually. Pyramid-shaped texture decreases to 1% of the original with the largest decrease proportion and the cylinder-shaped decreases the least, about 90% of the original. The coating thickness has an influence on the adhesion force but the effects are related to the Tabor parameters and texture height. The pull-off force increases gradually at a large Tabor parameter but decreases gradually at a small Tabor parameter with the coating thickness increasing from 1εbs to 16εbs. At larger Tabor parameter and bigger texture height, a secondary peak occurs in the adhesive force versus approach curves. All in all, the effects of texture types, density, height and coating thickness on the adhesive mechanical properties are revealed and the variation law of adhesive force and the pull-off force are summarized. The obtained results can provide theoretical guidance for the design and application of the adhesion mechanical structure of micro or nano texture surfaces in engineering practice. |
| Close |
|
|
|