Calculations for Crack Growth Rate in Whole Process Realized with the Single Stress-Strain-Parameter Method for Elastic-Plastic Materials Contained Crack

摘要

In consideration of the short crack and the long crack behaviors there are distinctly different, to use the theoretical approach, to adopt the simple stress-parameter, or the strain-parameter-method, to establish some 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 the transitional crack size and the crack growth rate at transitional point from short crack to long crack growth process respectively to put forward different expressions, also to provide the concrete and detailed calculation the steps and the methods; With respect to some key materials parameters for new discovering and there are functional relations, 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; to realize calculations for the crack growth rate in whole process based on conventional material constants.