Modelling mechanical properties of the multilayer composite materials with the polyamide core

Abstract

Abstract. Due to the wide range of application for belt conveyors, engineers look for many different combinations of mechanical properties of conveyor and transmission belts. It can be made by creating multilayer or fibre reinforced composite materials from base thermoplastic or thermosetting polymers. In order to gain high strength with proper elasticity and friction coefficient, the core of the composite conveyor belt is made of polyamide film core, which can be combined with various types of polymer fabrics, films or even rubbers. In this paper authors show the complex model of multilayer composite belt with the polyamide core, which can be used in simulation analyses. The following model was derived based on the experimental research, which consisted of tensile, compression and shearing tests. In order to achieve the most accurate model, proper simulations in ABAQUS were made and then the results were compared with empirical mechanical characteristics of a conveyor belt. The main goal of this research is to fully describe the perforation process of conveyor and transmission belts for vacuum belt conveyors. The following model will help to develop design briefs for machines used for mechanical perforation.

Determination of the effective geometrical features of the piercing punch for polymer composite belts

“…Plastic properties of the material were assumed as isotropic and were obtained as tabular values from the experimental stress-strain curve, where plastic strain 0 occurs at 112 MPa. The damage of the material was modelled with the simplified Johnson-Cook model [3], where the deformation rate and temperature are insignificant (d 4 and d 5 equal 0). The remaining J-C parameters are shown in Table 4.…”

“…Nevertheless, if we consider that the peak value of the perforation force is crucial information in the punch optimization, we can consider the presented model as useful enough. This approach was previously presented in [2,3] and the obtained results have proved that considering the composite as an equivalent homogenous material in FEM analyses may be used in this application and it was supported with multiple examples found in scientific literature [23][24][25][26][27][28][29][30][31]. However, using only FEM analyses may give some false results connected with the mesh or poorly chosen failure parameters, which is why authors used a combination of both methods of research in which the experimental tests results are used for model verification.…”

“…Based on the previous research presented in [2], the concave piercing punches, especially the one with spherical bowl, may greatly reduce the perforation force. According to Talaśka and Wojtkowiak [3], polymer composite belts may be divided into three groups: elastic light belts reinforced with fabrics, rigid belts with increased strength with thick films as their cores, and durable flexible belts reinforced with cords. The structure of the belts may be either multilayer or fibre-reinforced.…”

The influence of the piercing punch profile on the stress distribution on its cutting edge

“…1), it is very difficult to design the universal tool for each type of belt [1][2][3]. Basically, we can distinguish three groups of belts: the elastic light belts with polyurethane, PVC or rubber core, which can be reinforced by fabrics, the rigid belts with increased strength, whose core is made of a polyamide film protected by polyamide fabric gaskets and the durable and rather flexible polyurethane belts reinforced with aramid fiber cord [2][3][4] (most common as toothed belts [5], but also as v-belt or round belt [6]). Each group of belts provides different technical issues connected with the perforation process, which have an influence on the perforation parameters and the tool design.…”

The influence of geometrical parameters of the forming channel on the boundary value of the axial force in the agglomeration process of dry ice

“…The article presents the results of preliminary research on the influence of the geometrical parameters of the multichannel die on the limit stress value of the compaction process. Subject literature referring to different processes and materials indicates a significant relation between the geometrical parameters of the working system and the necessary force value to carry out the process under consideration [22][23][24][25][26][27].…”