Pull-through Damage Simulation in Composite Bolted Joints Using Numerical and Experimental Methods

Composite bolted joints are considered to be critical points in the design and manufacturing of composite structures. The present study is focused on pull-through loading, which produces damage in bolted joints in composite plates. The effects of various factors, such as variations in the thickness of the composite skeins, fixture clearance hole, foam thickness and using the washer on force-displacement graphs are investigated. Sandwich specimens consist of carbon/epoxy skins and foam core are manufactured and tested to verify the numerical simulation. A comparison was carried out between the obtained results using numerical and experimental methods. The obtained results showed that increasing the composite skin thickness increased the initial sub-critical failure load. In addition it was found that initial damage occurred at lower displacements in the specimens with thicker skin. Moreover, using the washer reduced stress distribution and increased initial sub-critical failure load. It was shown that by increasing clearance hole diameter the mode of failure changed from direct shear to bending type

کلیدواژه ها:

Composite ، Pull-through load ، Bolted joints ، Composite damage theories