A Modified Elastoplastic Contact Stiffness Model Considering Continuous Smooth Contact Characteristics and Substrate Deformation
| Autor: | Lixia Li, Ling Li, Meijuan Tong, Xiaohui Shi, Jingjing Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Surface (mathematics)
Hermite polynomials business.product_category Materials science Mechanical Engineering Computational Mechanics Stiffness Mechanics Deformation (meteorology) Machine tool Mechanism (engineering) Mechanics of Materials medicine medicine.symptom business Interpolation Asperity (materials science) |
| Zdroj: | Acta Mechanica Solida Sinica. 34:754-765 |
| ISSN: | 1860-2134 0894-9166 |
| DOI: | 10.1007/s10338-021-00244-w |
| Popis: | The contact stiffness of the joint surface directly affects the static and dynamic mechanical behavior, and accuracy of the machine tool. A new elastoplastic contact stiffness model is proposed by considering continuous and smooth contact characteristics and substrate deformation. First, the interpolation interval of cubic Hermite polynomials is improved to meet the continuous and smooth change of contact parameters during asperity deformation. Then, the micro-contact mechanism considering substrate deformation is explored by establishing an asperity-substrate system model. Furthermore, combined with statistical principles, a new contact stiffness model of the joint surface is established. Finally, the correctness of the built model is verified by comparing with experimental data and different contact models. The simulation results show that the model changes continuously and smoothly in the three deformation regions. The substrate deformation mainly affects the asperities in the elastic contact stage. The smoother is the surface, the more significant is the influence of substrate deformation. |
| Databáze: | OpenAIRE |
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