Análise do Comportamento Mecânico da Sobreinjeção com Insertos Metálicos

Gabriel de Deus Duarte Azevedo Neves Nunes

Key information

Authors:

Gabriel de Deus Duarte Azevedo Neves Nunes (Gabriel de Deus Duarte Azevedo Neves Nunes)

Supervisors:

Bárbara Perry Pereira Alves Gouveia Almeida (Bárbara Perry Pereira Alves Gouveia Almeida); Jorge Manuel Da Conceição Rodrigues (Jorge Manuel Da Conceição Rodrigues)

Published in

01/25/2021

Abstract

The mechanical behaviour of a component obtained by overmolding cannot be correctly analyzed through a structural simulation without considering its mechanical properties and the geometric changes resulting from the injection moulding process. In addition to the consequences arising from the manufacturing process, it must be taken into account that short fiber reinforced polymers have an anisotropic behaviour. Therefore, there is a need for this type of information to be assigned to the material, such as the mapping of the residual strains and fiber orientation obtained at the end of the injection analysis. In the structural analysis of components obtained by overmolding, it is also crucial to define a contact behavior between the different materials in order to get closer to the computational simplifications for a highly complex polymer/metal contact. In this work the experimental study of a set of components obtained by overmolding is performed considering three types of metal inserts and the time after obtaining the components, aiming to obtain the metal/polymer separation force in uniaxial tensile mode. It is also carried out a study for the numerical reproduction of the physical phenomena evidenced experimentally. To simulate the injection process Moldflow was used, while the structural analysis was performed by Abaqus. The mapping of the information from Moldflow to Abaqus and the mechanical characterization of the polymer was executed by Helius PFA. The numerical analysis aimed to reproduce the experimental curves, to validate the mapped information and to verify an approximate polymer/metal contact behaviour regarding the experimental cases.