An object-oriented approach for modeling and simulation of crack growth in cyclically loaded structures

Assessing plastically dissipated energy as a condition for fatigue crack growth

“…[18] and the main concepts will be summarized here for clarity. The unique feature of this approach is that the crack extension per load cycle (da/dN) is not prescribed but is the output from the simulations.…”

“…The proposed approach was shown to be able to capture both crack acceleration and crack retardation [18].…”

“…The parameters introduced in Section 2 of this study (the ''integrated domain" and ''critically dissipated energy") are material parameters and thus will depend on the material investigated. The numerical sim ulations are based on the computational scheme developed previ ously [18]. The scheme uses a modeling frame for conducting FE simulations, where the crack propagation is simulated via a node-release technique.…”

“…Currently. there are several avenues proposed for modeling fatigue crack growth in or der to obtain liFe prediction models, including using damage mechanics [7.8[, stress intensity factors [9][10][11][12] J.and energy criteria [13][14][15][16][17][18] as prediction tools for crack propagation. Some of these approaches are enhanced with incorporating various forms of "cy cle-jump" techniques, to accelerate the numerical simulations [19 23!. In this work, we investigate the concept of using plastically dis sipated energy as a criterion for crack propagation due to cyclic loading.…”

Implementation of a plastically dissipated energy criterion for three dimensional modeling of fatigue crack growth

“…The ABAQUS Scripting Interface (ASI) is an object oriented extension library based on Python [26]. The implementation is divided into two main levels [10], Python level and ABAQUS level as shown in Fig. 2.…”