Research On The Mechanical Properties Of Structural Adhesive Under Constant Temperature Coupled With Mechanical-loaded Environment

With the development of national economy, the energy and environmental crisis has become more and more serious. As a main industry, automotive industry has the responsibility for energy saving and emission reduction. As an important way of the energy conservation and emission reduction, the lightweight technology has gained more and more attention. Using a variety of high-performance lightweight materials is one of the main ways to solve lightweight problem, however it also causes a series of different material connection problems. Adhesive bonding technology can solve this problem well. Compared with the traditional welding technique, adhesive bonding technology not only can connect two different materials, but also has many advantages, such as lager bearing area, more uniform stress distribution and higher corrosion resistance and so on. Structural adhesive is an indispensable component of the bonding structure, research on structural adhesive can provide theoretical and data support for the bonding structure. Therefore, the current thesis used both experimental and numerical methods to study the mechanical properties of the bulk adhesive under thermal coupled with mechanical loading environment.Firstly, experiment under thermal coupled with mechanical loading and quasi-static tensile test were conducted on the Araldite(?)2015 bulk adhesive. To obtain the creep parameters of bulk adhesive, a pixel counting method was used. The results of quasi-static tensile tests indicated that failure strength of bulk adhesive rapidly decreased with the ageing time increase. The results obtained from the above experiments were used to obtain the material parameters of bulk adhesive in the finite element model (FEM), and also as a comparison with the result of FEM.Secondly, a time-hardening creep model was built in the FEM package ABAQUS(?) to simulate the creep behavior of bulk adhesive under thermal coupled with mechanical loading environment, ABAQUS(?) user subroutine USDFLD was used to extract the creep parameters of adhesive specimen in the process of ageing. Strength degradation model was also built. Creep parameters were imported into the strength degradation model to simulate the strength degradation behavior of the bulk adhesive specimens.Finally, the simulation results as well as the experimental results of the Araldite(?)2015 bulk adhesive were analyzed and found that they were in good agreement, which proved the correctness and accuracy of the model built in ABAQUS(?).