中国科学院南京天文光学技术研究所机构知识库

The curing of epoxy adhesives is a complex phenomenon where the thermal, the chemistry and the mechanics are coupled. Corresponding material properties such as mechanical and physics properties are evolving with the curing. This paper focuses on their predictions by a multiphisics FEM approach of the thermal, chemical and mechanical couplings involved by the curing for a novel assembly of radio telescope panel. The first part presents the constitutive model of an epoxy adhesive that is considered for the curing. The numerical solving, performed with a specific user subroutine of Ansys, is detailed and allows the study of real three-dimensional structure parts. Residual stresses and strains of different metallic membranes and internal adhesives in the interconnect during the assembly of radio telescope panel are

investigated. The mechanical response of the interconnect is analyzed with respect to the poisson’s ratio, relaxation time and adhesive thickness. It is shown that, although the overall residual stresses at the interconnect increase with the adhesive curing, the local strains have different evolving trends, indicating the possibility of damage and decohesion that might compromise mechanical integrity and interrupt the component processing precision.