Discussion on Some Problems in Anti-slip Coefficient Testing of High Strength Bolt Friction-type Joint Surface

Anti-slip coefficient is an important parameter for checking the coating quality of high strength bolt friction-type joint surface. From the parameter which was involved in four existing effective national and industry standards, the influence of specimen type, plate width, bolt aperture, bolt center distance and other factors in anti-slip coefficient testing was analyzed. The results showed that the two bole joint specimen could reduce the influence of inhomogeneous deformation of specimen to the test results compared with three bole joint specimen;as the bolt aperture increased, anti-slip coefficient decreased;under eccentric tensile load, anti-slip coefficient was small. Finally, the shortcomings of the existing test standard were discussed, and some suggestions were put forward.