Abstract
The study investigates the effect of several injection moulding parameters, such as the melt and mould temperature, on the adhesion obtained at the moulding of bi-component tensile test specimens. Mono- and bi-component specimens were subject to uniaxial tensile tests. The aim is to obtain a model analysis for the study of the mechanical behaviour of bi-component parts submitted to uniaxial tensile tests. The localised information on the state of stresses and strains at the interface between the two polymeric components is obtained through this analysis.The use of the G’Sell-Jonas model offers a good prediction regarding the mechanical behaviour of the two component tensile test specimens on both the elastic and the plastic regions. The simulation of the mono-component tensile test showed a good agreement between the experimental and the predicted results, with a correlation coefficient ranging between 0.9973 and 0.9998. High levels of confidence were obtained for the mono-component tensile test specimen results, further applied for FEA analysis of the two-component specimen (HDPE/LDPE). The necking effect observed in the experiments, at a 255°C melt temperature for the LDPE, was similar to the one revealed by the finite element analysis. Keywords: polymers, adhesion, tensile test, FEA