Research On Z-pin Connection Enhancement Mechanism Of Carbon Fiber Composite Transmission Shaft

Resin base carbon fiber composite components has excellent performance of light weight,big modulus,big specific strength,which give it a wide range of applications in weight loss and vibration direction.The drive shaft is one of its application.The shaft made of carbon fiber has properties of light weight and shock absorption,which can improve the dynamic properties of the shaft.Carbon fiber composite components drive shaft is connected by carbon fiber shaft and metal flange through a certain way,the joint performance determines the performance of the whole structure,so the domestic and foreign scholars have been researched on carbon fiber drive shaft connection modes for a long time.The connection modes including adhesive connection,mechanical connection,non-circular connection and so on.In addition,domestic and foreign scholars have been studied on the Z-pin connection enhancement,Z-pin connection(T tap,lapping)performance of carbon fibre laminated board and gotten mature conclusions.This paper applied mature board Z-pin connection enhancement,and studied the enhancement mechanism,influence parameters and technological process of carbon fiber composite drive shaft Z-pin connection.In this paper,the mechanism of torsional strength enhancement of Z-pin connection of carbon fiber composite drive shaft is studied theoretically.According to the constraint and load of the drive shaft at work,the simplified shaft model is simplified and the stress distribution is calculated by ANSYS finite element software.Analysis carbon fiber composite drive shaft Z-pin connection in the twisted state of the adhesive layer and the metal Z-pin stress,carbon fiber composite drive shaft Z-pin connection torsional strength enhancement mechanism: First,Z-pin can transfer part of the load;Second,Z-pin can to prevent the glue layer to continue to destroy it.This paper then tests the torsional strength of the carbon fiber composite drive shaft Z-pin connection.The torsional strength of the carbon fiber drive shaft Z-pin connection was 1.66 times that of the carbon fiber drive shaft adhesive connection.The test also compared the torsional strength of the different number of Z-pins and the different thickness of the tube,shows that the Z-pin has different effects on thetorsional strength of the Z-pin,and the important is the Z-pin near the end determines.The thickness of the carbon fiber tube can linearly increase the torsional strength of the joint,and the increase in the thickness of the carbon fiber tube in the adhesive does not have much effect on the torsional strength of the joint.At the end of this paper,the extrusion failure of carbon fiber shafts are studied.Experimental study of the extrusion strength of carbon fibers,the result that:extrusion fracture strength F of the carbon fiber,the defect length l has the relationship;fiber bending defect average length l,Z-pin diameter d has the relationship.In this paper,the reinforcement theory of Z-pin connection of carbon fiber drive shaft,the factors that affect the torsional strength and the extrusion failure of carbon fiber are studied by theoretical and experimental methods.The Z-pin number,distribution selection,The choice of carbon fiber tube thickness has certain guiding significance.