Resin Transfer Molding process (RTM), is the most used technology to create large parts made by polymer matrix composites because: the production time is relative small; the consumption of materials is reduced to minimum; the obtained parts are in a constant tolerance of ±0.5 mm after de-molding; both sides of the part are shiny and smooth; determinate resistance of the wall; it can be used with gelcoat on both sides or only on one; the reinforcement materials can be fiber glass, carbon fiber, sandwich materials, or metallic inserts; it does not need pressing during the curing of the resin; reduced cycle time, and low styrol emissions. In this paper the results of research regarding mathematical model of vacuum-RTM process for polymeric composites products are presented. It is taken into account that during mold filling and curing thin mold cavities, the thermal physical properties may vary from location to location and may change as a function of time. The studied material can be considered as homogeneous and isotropic. The results of applying some numerical schemes to solve the above model, corroborated with the results of the experimental measurements, can highlight the advantages of this method of mold filling.

Hybrid joints are a wide diffused design solution in the manufacturing industry for mechanical parts connection. The simultaneous use of two different connection mechanisms, such as bonding and bolting, allows to exploit the advantages of both techniques. There are many industrial applications where such methodology is extensively used, such as the automotive and aerospace ones. In addition to the many advantages offered by the use of hybrid joints, there are some troubles that limit their use and require the scientific research support for the development of such connections. With reference to a single lap joint, the flexural effects induced by the joint geometry are not negligible. The inhomogeneity of the joint along the load application direction inevitably determines significant bending effects, the more evident the thinner the adherends that constitute the joint. The bending effects can also lead to excessive section rotation, inducing effects of binding between washer and adherend. Such effect is even more evident in the case of polymeric composite adherends, rapidly leading the joint to a catastrophic end. In the present work some interesting experimental tests are shown, varying geometrical parameters of the joint.

Polymeric composites products are undeniable trends today, especially in the most innovative fields and with a permanent degree of novelty. The specialized literature presents a very wide range of their applications in the avant-garde fields such as the aerospace field and that of the automotive industry. Paper presents the results of research on modelling and impact simulation of these types of products besides a transient temperature analyse using the finite element method. Starting from the experimental part through which a flat composite product is made, the authors research its behaviour on impact and at the same time try to make a mathematical model by the finite element method. This comes to complete the experimental research by providing information on the mechanical stress that occur during experimental testing. The properties of the materials both those used in the realization of the experimental product and in the simulation are those offered by the manufacturers. The input data used in the finite element simulation tries to provide an image as close as possible to the probable behaviour of the product in case of car crash. Considering obtained results, large-scale industrial application is envisaged for automotive polymeric composite parts leading to the increase of the safety of the traffic participants in optimal vehicle manufacturing conditions.

Composite products have now reached very important production volumes in many avant-garde industries or always innovative industries such as automotive or aerospace. Composite products allow engineers to adjust the formulation to meet specific strength or temperature requirements of any application. In short by combining specific materials and adjusting them, polymeric composite products can be tailored to any vehicle. Polymer composite products for car bodies have component areas in the form of semi-cylindrical surfaces. The good behavior of these types of surfaces on impact or high temperatures is a requirement of traffic safety conditions for participants. Paper presents the results of research on modeling and impact simulation of these types of products besides a transient temperature analyze using the finite element method. Thus, the state of stress and deformations resulting from a structural analysis are highlighted, as well as the variation of temperatures from the transient thermal analysis. This results in suggestive researches images from which conclusions can be drawn regarding the possibility of using such polymeric composite structures in the automotive industry. As a result of the research carried out, in solutions for optimizing the body profile, the constructive typology of the polymer composite product and the manufacturing technology, respectively, leading to the increase of the safety of the traffic participants in optimal vehicle manufacturing conditions.

Composite materials are obtained by combining two or more materials with different physical properties, which maintain their properties at the macromolecular level, thus retaining their identity, to obtain a resulting material with characteristics clearly superior to the constituent elements, comparable to conventional materials in terms of performance. The specimens are made either by injection molding, machined from the center sections of a standard test sample (see ISO 20735: 2018), processed from semifinished, finished, rolled, or extruded products. In this sense, the article briefly presents the activity of creating a modeling, simulation. and tensile testing software program that can acquire control and process data, taken from an experimental stand or from a software simulation. Thus, the following elements are realized: software for retrieving data from the software equipment of the Zwick/Roell Z020 traction test machine; taking data from an experimental stand; simulation of tensile testing; creating reports, management of the production logistics chain of the benchmark. The experimental and theoretical results are further input in the design of the presented software.