Interfacial contact stiffness of fractal rough surfaces
Abstract In this work we describe a theoretical model that predicts the interfacial contact stiffness of fractal rough surfaces by considering the effects of elastic and plastic deformations of the fractal asperities. We also develop an original test rig that simulates dovetail joints for turbo mach...
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Nature Portfolio
2017
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oai:doaj.org-article:1107912d09604a55a0d7b3052ae3f2b52021-12-02T15:06:09ZInterfacial contact stiffness of fractal rough surfaces10.1038/s41598-017-13314-22045-2322https://doaj.org/article/1107912d09604a55a0d7b3052ae3f2b52017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13314-2https://doaj.org/toc/2045-2322Abstract In this work we describe a theoretical model that predicts the interfacial contact stiffness of fractal rough surfaces by considering the effects of elastic and plastic deformations of the fractal asperities. We also develop an original test rig that simulates dovetail joints for turbo machinery blades, which can fine tune the normal contact load existing between the contacting surfaces of the blade root. The interfacial contact stiffness is obtained through an inverse identification method in which finite element simulations are fitted to the experimental results. Excellent agreement is observed between the contact stiffness predicted by the theoretical model and by the analogous experimental results. We demonstrate that the contact stiffness is a power law function of the normal contact load with an exponent α within the whole range of fractal dimension D(1 < D < 2). We also show that for 1 < D < 1.5 the Pohrt-Popov behavior (α = 1/(3 − D)) is valid, however for 1.5 < D < 2, the exponent α is different and equal to 2(D − 1)/D. The diversity between the model developed in the work and the Pohrt-Popov one is explained in detail.Dayi ZhangYing XiaFabrizio ScarpaJie HongYanhong MaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017) |
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DOAJ |
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DOAJ |
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EN |
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Medicine R Science Q |
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Medicine R Science Q Dayi Zhang Ying Xia Fabrizio Scarpa Jie Hong Yanhong Ma Interfacial contact stiffness of fractal rough surfaces |
| description |
Abstract In this work we describe a theoretical model that predicts the interfacial contact stiffness of fractal rough surfaces by considering the effects of elastic and plastic deformations of the fractal asperities. We also develop an original test rig that simulates dovetail joints for turbo machinery blades, which can fine tune the normal contact load existing between the contacting surfaces of the blade root. The interfacial contact stiffness is obtained through an inverse identification method in which finite element simulations are fitted to the experimental results. Excellent agreement is observed between the contact stiffness predicted by the theoretical model and by the analogous experimental results. We demonstrate that the contact stiffness is a power law function of the normal contact load with an exponent α within the whole range of fractal dimension D(1 < D < 2). We also show that for 1 < D < 1.5 the Pohrt-Popov behavior (α = 1/(3 − D)) is valid, however for 1.5 < D < 2, the exponent α is different and equal to 2(D − 1)/D. The diversity between the model developed in the work and the Pohrt-Popov one is explained in detail. |
| format |
article |
| author |
Dayi Zhang Ying Xia Fabrizio Scarpa Jie Hong Yanhong Ma |
| author_facet |
Dayi Zhang Ying Xia Fabrizio Scarpa Jie Hong Yanhong Ma |
| author_sort |
Dayi Zhang |
| title |
Interfacial contact stiffness of fractal rough surfaces |
| title_short |
Interfacial contact stiffness of fractal rough surfaces |
| title_full |
Interfacial contact stiffness of fractal rough surfaces |
| title_fullStr |
Interfacial contact stiffness of fractal rough surfaces |
| title_full_unstemmed |
Interfacial contact stiffness of fractal rough surfaces |
| title_sort |
interfacial contact stiffness of fractal rough surfaces |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/1107912d09604a55a0d7b3052ae3f2b5 |
| work_keys_str_mv |
AT dayizhang interfacialcontactstiffnessoffractalroughsurfaces AT yingxia interfacialcontactstiffnessoffractalroughsurfaces AT fabrizioscarpa interfacialcontactstiffnessoffractalroughsurfaces AT jiehong interfacialcontactstiffnessoffractalroughsurfaces AT yanhongma interfacialcontactstiffnessoffractalroughsurfaces |
| _version_ |
1718388561253761024 |