The Life Predicting Calculations Based on Conventional Material Constants from Short Crack to Long Crack Growth Process

Abstract

To use the theoretical approach, to adopt the multiplication-method of two-parameters, by means of the traditional and the modern material constants, thereby to establish some of new calculation models in all crack growth process. In which are the equations of the driving forces, the crack-growth-rate-linking-equation in whole process, and the life predictions; and to propose yet some calculating expressions under different loading conditions. For key material parameters give their new concepts, and provide new functional formulas, define their physical and geometrical meanings. For the transition crack size from micro to macro crack growth process, provide concrete calculation processes and methods. Thereby realize the lifetime predicting calculations in whole process based on conventional materials constants and by the multiplication method of two parameters.

Two Kinds of Calculation Methods in Whole Process and a Best New Comprehensive Figure of Metallic Material Behaviors

“…In Fig. 1 it was provided by the present author [24,25], at this time it has been corrected and complemented, which is, diagrammatically shown for the damage growth process or crack propagation process of materials behavior at each stage and in the whole course.…”