Aging Characteristics Study Of Adhesively Bonded Joint In Hygro-thermal Environment

Along with the fast development of auto industry, growing environment and energy crisis, therefore, energy conservation and emission reduction becomes the main research trend of the car company. Automobile lightweight technology as an important technical means of energy conservation and emission reduction is paid attention by the car company. The bonding problem is effectively solved by using the adhesive bonding technique, and which has uniform stress distribution, large bearing area, good sealing, good fatigue durability and many other advantages. In view of this, the adhesive bonding technology is widely used in automotive, aerospace and other fields in recent years.At present, the research has drawn attention to the performance change of bonding structure under service environment. In this paper, the research has studied about the performance degradation of bonding structure under the aging water environment. Some material properties of the adhesive parameters is obtained from the aging characteristic test which is carried out through 2015 adhesive and Single Lap Joints under the condition of damp-heat, and the parameters can be used to provide data support for the following strength degradation prediction of bonding joint. Theory modelling is built about the environment aging behaviour of adhesive and finite element software is used to implement the simulation of the degradation process under the damp-heat aging condition, meanwhile, the results of numerical simulation are verified and analysed.The quasi static tensile test is carried out on the SLJ after aging under damp-heat condition and the degradation behaviour simulation model and residual strength prediction model are built about SLJ under aging condition. To develop the data transmission technology between the corresponding model and the accumulation of the aging data of adhesive as predefined field is to the residual strength prediction model of SLJ. Experimental results are compared with the simulation results and whether the data appears the same. The inner stress of adhesive layer and cohesive failure state are discussed and analysed after ageing condition.