Journal of Theoretical
and Applied Mechanics
0, 0, pp. , Warsaw 0

Identifying the Poly Methyl Methacrylate behavior during free thermoforming using experimental tests and numerical simulation

Mansour Sattarian, aazam ghassemi
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 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 identifying the real behavior of PMMA during free thermoforming to achieve maximum workable air pressure with respect to initial thickness. For this, at the 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 material property: three hyperelastic models (Ogden, Mooney-Rivlin, and Marlow) and a hyper-viscoelastic model. After that, experimental tests were done and the samples final shape has been compared with simulation results. Accordingly, the simulation results obtained based on Marlow hyper-elastic 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 has been achieved by finite element simulation.
Keywords: free thermoforming; poly Methyl Methacrylate; hyperelastic; hyper-viscoelastic; finite element

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