The Influence On The Mechanical Properties Of The Structural-functional Integration Antenna Caused By Manufacturing Defects

Structural-functional integration antenna which has not only the function of antenna but also bearing capacity, has important application value in the aerospace field. While, in the manufacturing process of structural-functional integration antenna, some defects will come into being inevitably, such as warpage, interface crack,cavity and so on. Aims at the typical structural-functional integration antenna, this paper mainly studies how the warping and interface crack caused in the manufacturing process influence to the mechanical properties of the structural-functional integration antenna. First of all, I established the finite element model of a ball grid array package(BGA) structure, and studied the deformation and the evolution process of the warpage defects in the temperature under cyclic loading; secondly, I established the finite element model of a sandwich cantilever beam structure with an interface crack, analyzed the evolution process of the interface crack under external load through introducing the cohesive zone model(CZM) to characterize the bonding conditions between layers; finally, I established the finite element model of the whole structure of structure and function integration antenna with imperfect interface crack, analyzed the evolution process of the interface crack and the influence on structure strength of the structural-functional integration antenna under external load combining with the existing cohesive zone model,which provide basis for antenna design.