| The lightweight autobody has become the important measures for the modern automotive industry to deal with energy crisis. With a variety of new materials are widely used in the body structure, the traditional material connection technology has become a bottleneck. Because bonding technology has many advantages, such as the process simple, cost-effective, reducing body weight, reducing energy consumption, cushioning noise, stress distribution joints for connecting dissimilar materials, so it plays an increasingly important role in the body structure of the joint connection.It leads to cohesive failure or interfacial failure for adhesive structure in a variety of factors’ influences. It leads to the cohesive failure inside the adhesive layer, which is relative to the inherent strength of the adhesive. However, it leads to the interfacial failure at the interface between the substrate adhesion and adhesive, which is relative to adhesive properties. Because it is difficult to achieve simulation analysis for the interface failure in existing software. Therefore, a series of experiments are designed to study the special adhesive properties of two different automotive adhesive opposite the substrate, according to the actual working conditions of bonding structure. The main work is as follows:First, in order to explore the impact of load on the adhesive properties, different bonding angles aluminum specimens are designed and manufactured in the paper, including 0° lap specimens, 90°butt specimen and 45°miter specimen which represents three forms of force. The adhesive properties of two different automotive adhesive opposite aluminum- aluminum substrate are studied in single shear stress, tensile stress and single pull-shear stress state respectively. Because it is difficult to processing into large size specimens for stainless steel and carbon steel materials and is easily to deform for processing into flakes specimen during the stretching process. Therefore, the stainless steel, carbon steel materials are designed and processing into a sheet- like material and bonded in the aluminum block. The adhesive properties of adhesive opposite aluminum- stainless steel, aluminum- carbon steel substrate are studied. Since both sides of the sheet substrate are required to smea r an adhesive, a bonding method of a substrate sheet is designed to ensure uniform consistency on both sides of the adhesive layer thickness. At last, in order to explore the effect of temperature on the adhesive properties, the single stretch, single shear and tensile shear combination experiments under high-temperature environment and low-temperature environment are designed.Through experimental research, the impact of load and temperature on the adhesive properties of two automotive adhesive opposite d ifferent substrates are attained, and the influence level of load and temperature on the adhesive properties by counting the percentage of damage interface. |
