Abstract
The paper treats Finite Element Analysis (FEA) specific to the mechanical behavior of a structural layer cap type with polymer cellular cores within a pressure vessel. The layered composite structure comprises two outer polymer shells (synthetic glass/ plexiglass) and cellular polymer core with triangular shaped cells. This analysis uses the Autodesk Inventor 2016 Professional 3D design and modeling software, in conjunction with the FEA analysis program, ANSYS 14.5 - Workbench, using the Mesh module. Mechanical behavior of the structural models specific to the four types of test caps, each having different cellular polymer core (ABS, PLA, PC and CF, 3 and 5 mm thickness), is revealed through the analysis of the state of stresses and deformations and correlating the FEA simulation results with experimental testing. Since the analysis leads to quasi-equivalent results under identical conditions of application until the fracture of the caps, it is found that such an FEA approach of the mechanical system components occupies an important place in the modern design process, being one of the ways of identifying the deformation fields and equivalent stresses in the analyzed composite structures.
Highlights
The research of recent years has highlighted the attempt to harmonize mechanical testing with standards that define in detail such procedures and provide clear information on the dimensions of the specimens, the tolerances, the details of the materials that can be used for the tests, yet the comparative studies between the methods in the standards European Testing and American (ASTM) showed both similar results and differences between test results on the same materials [1]
With all the cost and time constraints of prototype execution, Finite Element Analysis (FEA) application is an innovative solution of great interest both economically and in terms of simulation time, and its results are most of the times dependent of the performance of the computing programs and the possibilities of their use [15]
The intense preoccupations in the international academic field, demonstrated by the large number of scientific papers published in the field and supported by the results obtained in various industrial applications [2325], reflect the practical importance of the finite element analysis of any composite layered structures [4]
Summary
The analysis of the experimental model of a pressurized container with a laminated lid and a cellular polymer core is based on the finite element method and involves knowledge of material behavior, geometric shape, type of contact with other parts, loads / stresses, functional behavior etc. [2, 3, 9]. The pre-processing step is done using the ANSYS computing program, which involves meshing and obtaining a correctly split model into finite elements that does not introduce computational errors and is of a suitable size so as not to increase the processing time of the simulation. At this stage, it is intended to define the properties of the materials and their behavior according to the manufacturer / standard material / mechanical tests, the introduction of the limit conditions and the loads. To highlight the mechanical behavior of the whole structure and to correlate the results of the MEF simulation with the experimental tests [2, 9, 14], that took place until the composite cover was dismantled, it has been used the material release behaviors given by the material producers in combination with values in literature for properties for which no information is provided by producers
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