Experimental Research on the Triangular Lattice Type Polymer Based Composites Structures for Sandwich Panels Construction

Abstract

The paper presents experimental results on the mechanical behaviour for a polymer based composite sandwich panel tensile and bending tested, which uses, one by one, a cellular composite core fabricated by additive manufacturing of four different types of polymeric materials: ABS (acrylonitrile butadiene styrene), PC (polycarbonate), PLA (polylactide) and CF (polylactide + 40% carbon fibre), with the thickness of 3 and 5 mm. This research focuses on comparative analysis of the core thickness increase effect on the structure�s strength. Experimental tests carried out on standardized test-pieces with specialized laboratory equipment, are highlighting similar mechanical behaviour and are showing also an increase of composite stiffness with the increase of core thickness, at the same time, the arrangement of the cellular lattice structure has a significant effect on the structural strength.

Approaches Looking Finite Elements Analysis of a Structural Model of Lid Stratified with Cellular Polymeric Core Specific to a Pressure Vessel

“…Different simulations have therefore been made for each type of core material, 3 mm thick and 5 mm in total, 8 simulations. In order to highlight the mechanical behavior of the entire structure and to correlate the results of the FEA simulation with the experimental tests [9], 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 literature values [16][17][18][19][20][21], for properties for which no information is provided by manufacturers.…”

“…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]. deformations and stresses states of the structure with finite elements and the visualization in various forms (lists, fields, diagrams, graphs) of the obtained sizes.…”

“…Layer structure of layered composite sheets is shown in figure 3, below [2,3]. The purpose of the finite element analysis is to highlight the mechanical behavior of the composite structures specific to the stratified cover of the experimental model in figure 2 polycarbonate cellular polymers with ABS (acrylonitrile-butadiene-styrene) cellular polymers, PLA (polylactic acid or polylactide), PC (polycarbonate) and CF (carbon fiber) thicknesses of 3 and 5 mm [2,9].…”

“…1), the main function of the cell core is to stabilize the outer sheaths to avoid buckling and deformation and to withstand the shear stresses along its thickness. The outer envelope supports, besides some of the local stresses and tension and compressive stresses, their main function being to provide the bending and shear stiffness of the sandwich assembly [2,9]. Therefore, the use of modeling and simulation through the finite element analysis of mechanical system components occupies an important place in the modern design process and is one of the ways to identify deformation fields and equivalent stresses within the analyzed composite structures [2].…”

Approaches to the evaluation of the mechanical properties of single-layer composite plates made of recyclable polymeric and protein materials

“…The main mechanical properties involved in the structural analysis of composite elements are strength and rigidity. These properties can be determined experimentally, but the tests are valid for a single fiber-matrix system, obtained with a certain manufacturing process (Hadăr, 2002;Alămoreanu and Chiriță, 1997;Durbacă et al, 2017;Păunescu, 2002;Tudorachi, 2007). Therefore, it is recommended to use theoretical and semiempirical models that allow the evaluation of mechanical characteristics based on parameters that influence the properties of the composite structure.…”