How to Repair Calculation of Age Fatigue Bolt

So far, we use the Goodman diagram that can answer some of our purposes, this chart can determine the fatigue strength of a material but remain less accurate if the strength average close to or more than the price of the material elastic limit. Despite this, lack of comfort is commonly used methods not counted because the parameters that cause the failure of the deformation elastoplastis from the area where the elastic limit is exceeded (at the bottom of the screw). To improve the way these calculations, in this posting will be conducted elastoplastik analysis of strength and strain in the elastic limit area which then made the most appropriate models. To be able to support these methods, the initial study carried out relating to the nature of the material used for the bolts, the steel 35CD4. In addition the calculation is also done on the basis of local voltage using a screw element method. From these initial studies we can obtain the material elastoplastik model, then we choose a model of mechanical failure by using a continuous variable from failures associated with the number of loads cycle.