• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2019, Vol. 55 ›› Issue (1): 81-90.doi: 10.3901/JME.2019.01.081

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Experimental and Numerical Analysis of the Elasto-plastic Oblique Contact-impact Dynamics Using Digital Image Processing Method

WANG Yao1,2, MENG Wenjun1,2, XIANG Dan3, LI Shujun1,2   

  1. 1. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024;
    2. Key Laboratory of Intelligent Logistics Equipment of Shanxi Province, Taiyuan University of Science and Technology, Taiyuan 030024;
    3. Oil-film Bearing Branch, Taiyuan Heavy Machinery Group Co., Ltd., Taiyuan 030024
  • Received:2018-01-13 Revised:2018-09-28 Online:2019-01-05 Published:2019-01-05

Abstract: For the elasto-plastic oblique impact problems, it is still difficult to measure and predict the motion parameters and contact force of the impact object during the contact impact events. With consideration of vibration responses, the kinetic model of impact object is established based on the assumed mode method and generalized momentum theorem. Considering the vibration responses in the contact deformation, the changes of contact force during the elasto-plastic contact impact has been studied theoretically based on the Jackson-Green model. The impact test with multi-markers is performed. The digital image processing method is used to describe and track the motion law of the impact object during the contact impact. Experimental results for the coefficient of restitution and the motion parameters after impact have been compared with simulations. The experimental and simulation results show that the judgment condition for sliding friction, , presents the W-distribution; and, three critical initial impact angles, 27.5°, 42.5°, and 58.4° are found to determine whether the impact object slides or not. For the impact angle θ=45°, simulation results are found to be in good agreement with the experimental data in terms of the rebound velocity of the contact point, the angular velocity and the coefficient of restitution. All the relative error is less than 5%. Thus, it can be verified that the established model is relatively accurate.

Key words: coefficient of restitution, contact mechanics, digital image processing, elastic-plastic material, oblique impact

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