Search Results

The configurations of sputtering sources and the shape and orientation of parts to be coated exert a strong influence on the appearance and integrity of metallized decorative coatings. Magnetron sputtering sources, which have sufficient speed and low substrate heating for the practical metallizing of plastic automotive parts, are also characterized by extended shapes that influence the properties of the deposited films. Data are presented for the film stresses and reflectances of pure chromium and Cr-alloy coatings sputtered from planar and cylindrical sources. The cylindrical post magnetron geometry enhances the production of compressive film stresses that prevent cracking, while also maximizing the optical reflectance. Results are also presented for the effects of substrate orientation and rotation on the stresses and reflectance of pure chromium and stainless steel coatings.

A general treatment of the absorption of mechanical energy by the axial collapse of a variety of structural shapes, including tubes, honeycombs and foams is developed which encompasses both the geometry of the structure and also the material properties. The use of the method in the design of load bearing structures in which energy absorption is an additional design function is illustrated. High strength-to-weight ratio materials offer a significant weight saving for energy absorbing components, although such materials may have a reduced tensile ductility. The implications to situations in vehicle crashworthiness are discussed.