Research of Application of Crash Durable Adhesive on a Chinese Domestic Car Body

摘要

Methodology: There are several methods to evaluate the adhesive bonding performance. In this study, three categorical methods were employed. Firstly, for the adhesive location selection, the CAE analysis was used to identify the adhesive bonding effect on body stiffness improvement. Combined the simulation result with work shop assembling process, the key flanges for adhesive were optimized. Secondly, for the adhesive grade selection, the tensile lap shear, T-peel, impact peel test at high and low temperature environment, the salt spray test, humidity test and wash off test were selected. Thirdly, for the crash performance verification, the axial drop tower impact test with Dow new crash durable adhesive was simulated with explicit finite element method. Through above three technical methods, the over-all properties and detail application area in car-body were derived. Results: The lap shear and peel testing results show that the crash durable adhesive product could fully meet the requirement of automotive industry. The low-temperature shear strength is above 35 MPa. The axial crush testing simulation results show that the load resistant capability of Dow crash durable adhesive is superior to spot welding joining. Through the computer-aided engineering (CAE) analysis on one of Chinese domestic car with the crash durable adhesive, the bending stiffness could be increased up to 8 %. Limitations of this study: The study is mainly directed against cold-rolled steel sheet that a Chinese domestic OEM used. For galvanized steel, high strength steel, and other alloy like magnesium and aluminium testing are studied in other separate study. What does the paper offer that is new in the field including in comparison to other work by the authors? This paper presents a complete set of new adhesive bonding verification analysis and test tools, the study aimed to validate and verify the application and contribution of this new vehicle body bonding technology on Chinese domestic car body trough testing and CAE method, which has significant value on the promotion and application of new automotive materials. Conclusions: The new type of crash durable adhesives in this study can meet all of Chinese domestic OEM standards. And it could help to enhance body stiffness, increasing vehicle crashworthiness and durability. It is a high efficiency connection type which could be the alternative of spot welding.