Structural adhesive bonding technology is widely utilized in various applications in modern automotive and aviation industries. Finding new techniques to enhance adhesion strength between bonded components in a more economical and environmental-friendly way is becoming an important issue. In this paper, a novel micro-surface texturing method by using a developed deformation-based micro-rolling system has been applied to modify surface conditions of a sheet metal in order to increase metal-to-metal adhesion strength. Additionally, different surface texturing patterns, such as microchannel arrays and grid pattern, are produced by single-pass or two-pass micro-rolling strategies. The effect of these texture patterns on adhesion strength is studied through single-lapjoint shear strength test. Results indicate that surface with micro-textures are able to achieve noticeable improvement in adhesion strength.
Stay cables of long span cable-stayed bridges are easy to vibrate under wind or wind/rain loads owning to their very low inherent damping. To install cable dampers near to the anchorages of cable has become a common practice for cable vibration control of cable-stayed bridge structures. In this study, the behaviors of a nonlinear frictional type of damper were investigated. The equations of motion of a cable with a friction damper were derived by using a lumped mass model. Then by introducing modal transformation, the analytical solution for the motion equations was obtained. The results show that the friction damper evokes linearly decaying of free vibrations of the cable as long as the damper does not lock the cable. The modal damping ratio of cable with the friction damper is strongly amplitude dependent. Calculation of modal damping ratio can be simplified using control parameter and the maximum modal damping ratio can be obtained. A universal estimation curve is proposed that is similar to linear viscous damper. These studies could provide design basis for the vibration mitigation of stay cables using nonlinear friction.
SUMMARYA useful and simple algorithm is presented for interactively generating B-spline interpolation curves and surfaces from B-spline approximation solutions. The difference between the data points and the B-spline approximation is used to modify the control vertices in order to generate a succession of B-spline approximations which converge rapidly to the interpolation solution. The intermediate B-spline approximations can be viewed interactively and the most appropriate solution selected for a particular application.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.