پديدآورندگان :
Hosseini Seyed Meysam MSc, Department of Mechanical Engineering, K.N.Toosi University of Technology, Tehran, Iran ; Fuel Cell Technology Research Laboratory, Malek Ashtar University of Technology, Fereydoonkenar, Iran , Alizadeh Ebrahim Fccenter@mut.ac.ir Associate professor , Fuel Cell Technology Research Laboratory, Malek Ashtar University of Technology, Fereydoonkenar, Iran , Rezaei Firouzjaee Mohammad MSc, Fuel Cell Technology Research Laboratory, Malek Ashtar University of Technology, Fereydoonkenar, Iran , Masrori Saadat S. H. MSc, Fuel Cell Technology Research Laboratory, Malek Ashtar University of Technology, Fereydoonkenar, Iran
كليدواژه :
Submarine , Fracture Mechanic , Finite Element Method , Life Prediction , Stress Intensity Factor
چكيده فارسي :
This paper investigated the effect of residual stress due to welding on the submarine remaining life estimation, according to fracture mechanics. After determining the critical zone of the U-100 submarine pressure hulls, that used by the Germans during the Second World War, by putting the hypothetical cracks in the pressure hulls, the stress intensity factor ,the bending stress intensity factor and the residual stress intensity factor caused by welding processes are calculated. The effect of each stress intensity factors parameters are investigated on the total stress intensity factor. The stress intensity factors and bending stress intensity factors are calculated using finite element method and the results are compared with the calculated analytical results. The results revealed that the finite element model has good accuracy. Then, using the finite element results and the Paris laws, submarine life was calculated. Finally it was concluded that the residual stress intensity factor caused by welding
processes has the most portions in the total stress intensity factor of the structure and it will significantly reduce the life of the submarine. It is notable that the ABAQUS v 6.14 is used for finite element method.
