Study Of A Pre Tensioned Bolt

Study Of A Pre Tensioned Bolt Analysis can be made of the stresses and strains produced in a bolt after different methods of tightening, and allows modelling of the behaviour of a bolted connection when axially loaded. Teaching objectives The apparatus allows the following experiments: Deformations in a bolt after tightening with a spanner or with a torque wrench. Effect of bolt pre-tensioning using a hydraulic loading system. Effect of varying the loading position. Effect of varying the materials on the loading torque. Static analysis of sliding with friction on a helical screw contact surface or plane. Simple loading and stresses on a plane section. Mohr’s Circles of stress, principal stresses and their directions. Technical specifications The pre-loaded bolt assembly is composed of : A 16mm bolt on which are fixed three pairs of diametrically opposed 45° strain. These permit the measurement of extension and tension in the bolt. A tubular component with 2 strain gauges mounted at 180° to measure the compression in the assembly at different heights. A loading tube to apply bolt pre-load or to apply loading force at various positions along the bolted assembly. A manually operated hydraulic pump. A micrometer dial gauge to measure extensions over the complete assembly. Nuts and washers of various materials. Equipment Package : Pre-loaded bolt assembly with hydraulic loading system and manual pump. A set of washers. Technical manual and teaching notes.   Dimensions and weight 15 diam. x 37 cm – 12 kg Pump: 40 x 10 x 14 mm – 3,5kg   Essential requirements Electrical supply : 220V, 50 Hz Additional required equipment : Extensometer bridge. A ring spanner 24 mm. A torque wrench of capacity 40 – 200 Nm with 24 mm nut

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