Finite Element Analysis Of Pressure Port Stress Blanking Model

From the viewpoint of material science and fracture mechanics, crack means disaster. It leads to abrupt failure of components, which may result in enormous accidents. But to the view of developing the utilities of crack, its spreading can be used to stress blanking. When the crack technique is raised and intercross with the machining technique, a new field is cut. With the development of application and various stress blanking, new demands are putted forward. In order to decrease the time of spending on making notch, the paper put forward the thinking of using impress-notch replace cut-notch, the main goal of this paper is use FEA to study the stress blanking with impress-notch, and get the reasonable design parameters.In order to analyze the fracture, which with impress-notch, the method and procedure of FEA is discussed, and the function of contact analyzes and fracture analyze of the ANSYS is discussed. The theory foundation of stress blanking which with impress-notch is also discussed. With the V-notch problem as research object, the representation of SIF is also discussed.On the basis of the existing achievement of fracture mechanics and crack technology, with the powerful pre-solution function of ANSYS, the 3D geometry model of impress blade and round bar is set up, 3D FE model is built by means of cut-boundary method, smart mesh and sweep mesh. For the application of stress blanking, all kinds of geometrical parameter are computed, so the result, which can be used for application, is got.The "stress-extrapolation" method is used to compute SIF, the accuracy of the method is related to the distance of crack-tip, the appropriate distance is fixed through calculating. The distributing of SIF along the root of notch is founded, the situation where crack started is confirmed, and the dynamic SIF is calculated. In order to validate the correctness of the method, another method called "1/4-point distance-extrapolation" is used to calculated some SIF and find the results of the two different methods are very close.Reasonable parameter for fracture design is confirmed. The non-dimension SIF is used as foundation of design. The changing law of non-dimension SIF is got by changing the notch parameter, so the parameter for fracture design can be confirmed. The research results of this paper provide the foundation for the application of stress blanking with impress-notch.