Study Of Stress Distribution In Weld-bonded Steel Disc

The weld-bonded steel disc is the main research objects.The main purpose of the study is to find out ways to optimize the bonded structure and improve the stress distribution and strength of the structure.Based on the present research,the finite element numerical analysis software Ansys were used The effects of some factors(size of weld spot,position of weld spot,adhesives and load)on the impact toughness of Charpy adhesive joints are studied.The main research results are as follows:(1)The change of the diameter of solder joint has no effect on the failure form of the structure.With the increase of the diameter of the solder joint,the distribution of the normal stress,the first principal stress and the equivalent stress at the center and interface of the adhesive layer are consistent,and the peak value decreases first and then increases.The peak value of axial stress appears at the joint of solder joint and glue layer.When the diameter of solder joint is 5mm,the peak stress on the whole path is the smallest.Properly increasing the diameter of the solder joint can effectively improve the joint strength of 5 mm is a numerical model analysis of the best process parameters.(2)Location of stress concentration such as Sx?Sy and S1 on the path moved with the weld spot moving.Peak value in the spot zone decreased as it moved from center to edge.Concentration mainly occurred at center of disc and spot zone.Shearing stress Sxy decreased firstly and then increased with the spot moved from center to edge.According to the research of this paper,we draw the conclusion that spot center located in 87 mm from the center is the best.(3)The effect of recessing showed that it was a defect and should be avoided for the reason that it would cause stress concentration at the junction of adhesive and weld spot,also at the interface where the recessing appeared.(4)Compared with four kinds of adhesives: acrylate adhesive,polycarbamate adhesive,epoxy resin adhesive and phenolic resin adhesive,the stress distribution was followed by acrylate adhesive,polycarbamate adhesive,epoxy resin adhesive and phenolic resin adhesive.Therefore,acrylic adhesive is more suitable for selection.(5)According to the overall stress distribution the size of the solder joint the position of the solder joint the type of adhesive and the lack of glue will not greatly change the overall stress form of the structure that is to say the change of these factors will not affect the failure form of the structure.However,the strength of the structure can be effectively improved by fine-tuning the position and size of the solder joint and selecting the suitable adhesive.The conclusion of this paper provides some references for the selection of technological parameters of the actual structure.(6)The results obtained from the elasto-plastic FEM analysis show that the effect of torsional load on the weld-bonded steel disc structure is obviously.For the shear and the von Mises equivalent stress all the values of the stress including the peak ones are increased as the torsional load increased.The value of the peak stress is occurred within the region of the nugget and a lower one occurred at the center of the nugget.The value of the stress at the point near the outer edge is much higher than that one near the inner edge under a same torsional load.The values of both shear and von Mises equivalent stress along the direction of the periphery are nearly kept as the same especially in the region out of the nugget to a certain torsional load.The slope of the line for the maximum values of the shear stress along the direction of radius is higher than that one along the periphery and the slope of the line for the shear stress at the point near the outer edge is also higher than that one near the inner edge.