Influence of Preload Force on Tensile Mechanical Properties of Composite Bolted Joints
A model of composite single-bolt single-lap joint was established to study the influence of preload and assembly stress on its tensile mechanical properties.Eleven sets of different sizes of preload levels were set up in the experimental study,and the behaviour of preload size on the tensile stiffness and peak load of the composite joints were obtained.The strain fields on the joint surface were obtained using a 3D-DIC full-ield strain measurement system,and the influence of the damage factor reflecting the assembly stress level on the mechanical properties of the joint was analyzed.The results show that the tensile stiffness and peak load of the composite bolt joint increases first and then decreases with the increase of the preload force for 6.35 mm diameter bolts.The best mechanical properties are obtained at a preload of around 12 kN,when the peak load is 16.66 kN and the tensile stiffness 19.12 kN/mm.
万方数据
维普
