Calculations for Crack Growth Rate in Whole Process Realized with Two Kinks of Methods for Elastic-Plastic Materials Contained Crack

摘要

In view of short crack and long crack behaviors there are distinctly differences, to use the theoretical approach, to adopt the simple stress-parameter, or the strain-parameter-method and the multiplication-method of two-parameters, to establish numerous new calculation models in whole crack propagation process for elastic-plastic steels, which are the crack growth driving forces, the crack growth rate equations for different stages, the crack-growth-rate-linking-equation in whole process; For transitional crack size and the crack growth rate at transitional point from short crack to long crack growth respectively to put forward a lot of expressions, to provide the concrete and detailed calculation process, the steps and the methods; For new discovering and there are functional relations of some key materials parameters, respectively to give the new calculable formulas, the new definitions, the new physical meanings and geometrical meanings for them. Thereby to make linking and communication between for the modern fracture mechanics and the traditional material mechanics; So that to realize calculations for the crack growth rate in whole process based on traditional material constants with two kinds of methods.