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| Author(s): |
Leonardo Monteiro Mazzariol
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2017-02-03 |
| Examining board members: |
Marcilio Alves;
Marco Lucio Bittencourt;
Alexandre Kawano;
Rogério José Marczak;
Giancarlo Barbosa Micheli
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| Advisor: | Marcilio Alves |
| Abstract | |
It is hypothesized that it is possible to reproduce the behaviour of the prototype by using models made of different materials. The influence of thickness, different densities, flow stresses, hardening and viscoplasticity are all evaluated through analytical equations and simulations of basic structures such as beam, plate and the impact of a double plate structure. In addition, quasi-static and dynamic materials characterization are conducted , with experiments being performed in circular plates for three different scales (1/1, 2/3 and 1/3), four materials (Aluminum, Titanium, Stainless Steel and Copper) and two conditions impact of a mass (3,5m/s) and a projectile at high speed (130m/s). It is shown that the use of Johnson-Cook\'s law to describe the viscoplastic behavior of the materials allows a satisfactory approximation to the calculation of the corrected impact velocity, without the need for additional information on the behavior of the structure. In addition, the results reveal the relevance of maintaining the ratio between impact mass and structure mass constant in model and prototype, leading to the desirable similarity of the distortions between the two. Thus, when confirming the hypothesis of this work, it is possible to infer the behavior of a prototype using small scale models made from different materials. (AU) | |
| FAPESP's process: | 14/03135-7 - Representing structures under impact load using scaled models: structure and model made of different materials |
| Grantee: | Leonardo Monteiro Mazzariol |
| Support Opportunities: | Scholarships in Brazil - Doctorate |