Document Type : Full Research Paper
Authors
1 PhD Candidate, Mechanical Engineering School, Iran University of Science and Technology
2 M.Sc Graduated, Mechanical Engineering School, Iran University of Science and Technology
3 Assistant Professor, Mechanical Engineering School, Iran University of Science and Technology
Abstract
An analytical method to predict the response of the inclined impact of a fluid filled elastic spherical shell having an arbitrary thickness with an elastic toroid is investigated in this paper which can be a model for analytical evaluation of blunt impact on the human head. The study is performed under a combination of Hertzian contact theory and the local effect of membrane and bending of the shell in order to state the implicit equation to determine the transmitted force. With respect to the analytical responses, it is concluded that transmitted force decreases and contact duration increases by increasing of attack angle in constant initial velocity. In addition, closed form solution is presented to obtain impact parameters including the duration, the maximum transferred load and the maximum acceleration of the shell which particularly important for the researchers. Therefore investigation of the important quantities of the impact problem with closed form solution is possible. On the other hand, limiting cases will be discussed in next step and the concluded results are validated by finite element methods to verify the response of the model. In this step, a good agreement between analytical responses and numerical results is observed that reveals the correctness of analytical equations. In the final step of this research, obtained results are compared with experimental data.
Keywords
- Fluid Filled Spherical Shell
- Elastic Toroidal Object
- Impact
- Hertz Theory
- Membrane And Bending Effect
Main Subjects
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