...AN EFFECT OF BEARING SURFACE ANGLE AT BOLT HEAD ON THE NUT FACTOR AND CONTACT AREA RATIO IN TIGHTENING BOLTED JOINTS Atsushi SHIRAKAWA1 Honda R&D Co., Ltd. Automobile Center Hagamachi, Tochigi, Japan Toshiyuki SAWA2 Professor Emeritus, Hiroshima University Minamisuna, Koto-city, Tokyo, Japan...

...VARIABLES AFFECTING NUT FACTORS IN BOLTED FLANGE CONNECTIONS Justin B. Aycock, Jeffery Wilson VSP Technologies Prince George, VA USA justin.aycock@vsptechnologies.com Anita Bausman VSP Technologies Kingsport, TN USA ABSTRACT Bolted flange connections are heavily used within the chemical production...

... are investigated. The FEA simulation provided in this study would be helpful for developing reliable tightening strategies for joints with (as cast) non-parallel bearing surfaces. Keywords: FEA simulation of bolt tightening, nut factor, non- parallel contact. NOMENCLATURE D Nominal diameter of the fastener F...

... is changed but the tightening is continued until the full target torque is reached. The effect of tightening speed combinations (for stages one and two) on the torque-tension relationship is investigated. Data on the coefficients of thread and bearing friction as well as the Nut Factor K is investigated...

... and structural applications. Coating thickness Nut factor Thread friction Bearing friction t NOMENCLATURE TA E F C proofF P HighF H lo peakF M LowF L lo )(uF M K N L N ( )LNA R p max Maximum shear stress for bulk material Proceedings of PVP2008 2008 ASME Pressure Vessels and Piping Division...

... and loosening is also investigated using M12, Class 8.8, fasteners with and without zinc coating. The torque – tension relationship is examined in terms of the non-dimensional nut factor K. The wear pattern is examined by monitoring the changes in surface roughness using a WYKO optical profiler and by using...