Research On Cyclic-temperature Aging Characteristics Of Adhesive Structure

With the continuous development of modern society, the more and more heavy environment pressure and the serious shortage of natural resources has forced auto industry to make efforts on energy conservation and emissions reduction. Lightweight technology as an important technology of automobile energy conservation and emissions reduction has become a main trend in the development of automobile industry. So far, the use of lightweight materials is the main technical way to lightweight. It is facing a connection problem of dissimilar materials. Adhesion technology as a new connection technology can effectively solve the problem of the connection between the dissimilar material, and it has the advantages of light quality, stress distribution uniformity, good sealing, and good fatigue resistance performance. It has been widely used in automotive, aerospace and other fields.Scope of application of adhesion technology is more and more widespread, and in the process of adhesive joint service the adhesively bonded joints have to face all kinds of natural environment, including temperature, humidity, acid and alkali, salt fog, illumination, etc., and these can make adhesive joint ageing, reduce the cementing strength, so the aging of adhesive structure research is very necessary. The researches of adhesive structure at home and abroad don’t investigate the adhesive aging of cyclic temperature field. In order to make up for the gap, this paper carried out the adhesive joint structure in cyclic temperature field in the aging test, and introduced the environmental degradation of aging parameters that can effectively characterize the aging condition of joint. The cohesive zone model (CZM) based on fracture mechanics can effectively predict the bonding joint strength and crack propagation. After aging test, the specimen fracture surfaces were investigated by scanning electron microscope (SEM), and explained why reduce the strength of glue joint from the micro. Based on the cohesive model, an aging environment environmental degradation model (EDM) is established. It can effectively predict the residual strength of the aging specimens. This paper will contribute to the further promotion application of adhesive technology.