ARTICLE
Identifying the poly methyl methacrylate behavior during free thermoforming using experimental tests and numerical simulation
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1, 2
| 1 | Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad |
| 2 | Modern Manufacturing Technologies Research Center, Najafabad Branch, Islamic Azad University, Najafabad |
Online publication date: 2019-10-15
Publication date: 2019-10-15
Submission date: 2017-07-19
Acceptance date: 2019-05-17
Journal of Theoretical and Applied Mechanics 2019;57(4):909–921
KEYWORDS
ABSTRACT
Thermoforming is one of the new methods for forming of polymer sheets. Free thermoforming
is one of the thermoforming methods in which shaping is done with air pressure or vacuum
without the plug mold. In this paper, free thermoforming of Poly Methyl Methacrylate
(PMMA) has been investigated by experimental tests and finite element simulation. The
main purpose of this article is the identification of the real behavior of PMMA during free
thermoforming to achieve maximum workable air pressure with respect to initial thickness.
For this, at first, tensile and relaxation tests have been done in working temperature (160◦C).
Then the process was simulated by Abaqus software with considering four types of the
material property: three hyperelastic models (Ogden, Mooney-Rivlin, and Marlow) and a
hyperviscoelastic model. After that, experimental tests were done, and the samples final
shape were compared with simulation results. Accordingly, the simulation results obtained
based on the Marlow hyperelastic model showed the best agreement with the experiments
compared to others. After that, maximum workable air pressure versus plate initial thickness
and minimum thickness of the deformed plate were achieved by finite element simulation.
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