A strain energy based damage model for fatigue crack initiation and growth

Research paper by P.J. Huffman

Indexed on: 01 Apr '16Published on: 31 Mar '16Published in: International Journal of Fatigue


A strain energy based fatigue damage model is proposed which uses the strain energy from applied loads and the strain energy of dislocations to calculate stress-life, strain-life, and fatigue crack growth rates. Stress ratio effects intrinsic to the model are discussed, and parameterized in terms of the Walker equivalent stress and a fatigue crack growth driving force. The method is then validated using a variety of different metals with strain-life data and fatigue crack growth rate data available on the SAE Fatigue Design & Evaluation subcommittee database.

Figure 10.1016/j.ijfatigue.2016.03.032.0.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.1.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.2.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.3.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.4.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.5.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.6.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.7.jpg
Figure 10.1016/j.ijfatigue.2016.03.032.8.jpg