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Strength assessment of bolted connections : the effect of geometric non linearity and stress stiffening on bolt stresses

Strijdveen, M.M.A. (2016) Strength assessment of bolted connections : the effect of geometric non linearity and stress stiffening on bolt stresses.

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Abstract:The development of wind turbines is a complex task as they should meet several European and Global safety norms regarding the construction, maintenance, performance and grid connection. A certificate is necessary for the manufacturer in order to demonstrate that the turbine satisfies the norms. MECAL Wind Turbine Design (WTD) is an engineering company which has contributed to the development of many different turbine technologies. Part of their work is the strength assessment of bolted connections using the Finite Element Method (FEM). During this internship the effect of two phenomena: geometric non linearity and stress stiffening on the strength assessment procedure of bolted connection is investigated. Geometric non linearity refers to taking into account large displacements. Stress stiffening refers to an increment in bending stiffness of the structure as a consequence of an axial force. It is mainly visible in structures with a low ratio of bending/axial stiffness. Regarding bolted connections, it is expected that taking into account stress stiffening during bolt assessment will result in higher bending stresses. The axial force which is responsible for the increment in bending stiffness equals the pretension force. The translation of the bolt geometry to a Finite Element (FE) model is done by MECAL using beam elements. The stresses at the transition of the thread to the shaft and the ends of the bolts are assessed. An alternative op
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Link to this item:http://purl.utwente.nl/essays/72016
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