Study On Adhesive Bonding Performance Of Steel And Aluminum Used On Automobile

There are two kinds of materials which can lighten the weight of automotives. One is lightweight material like aluminum and the other is high strength material like high strength steel. The price of lightweight material such as aluminum is higher than steel, so using two kinds of materials can optimize quality and price together. Since the big differences of mechanics and thermodynamics capability between steel and aluminum, they can't be welded together straightly. Also regarding their electric potential differences, aluminum will be corroded quickly as anode of steel if they are mechanical connected. So how to solve connection and erosion problem of different materials is an important task and it's meaningful to study the lightweight material and high strength material applied on the automotive industry such as aluminum and high strength steel. This paper will use adhesive bonding technology to solve the problemof two kinds of materials connection. It can connect materials with great capability differences, divides opposite electric potential material structurally through adhesive, and has advantages such as lighter, stronger and better fatigue properties. Therefore the research of adhesive bonding capability between steel and aluminum is significant to enlarge the range of automotive body materials.This paper studies the adhesive bonding capability of DP600 high strength steel, low carbon steel, 2A12 aluminum and adhesive A. In the paper, mechanical analyzing, test analyzing and finite element method (FEM) analyzing are carried out. Firstly, the biggest tensile load which the bonded joint can bear is estimated using the yield strongth of the adherend through an mechanical model eatablished. In this model a function relate with curing process parameter is also given out. Secondly, shear stress and peel stress distribution of balanced and unbalanced adhesive bonded joints based on the beam model are culculated when put the estimate load at the end of the adherends, and the rationality of eatimating value is proved. Thirdly, the optimum curing process parameters suitable with the mechanics model are found out and rationality of the estimated value is also validated by test. Fifthly, stress distribution of the unbalanced adhesive bonded joint under different adhesive thickness is...