Hello everyone,
I'm modelling fatigue crack growth of a metallic CT specimen based in ASTM E647 standard in Abaqus using XFEM and low cycle fatigue with *DIRECT CYCLIC approach and have some doubts in how to model the material parameters, fracture criterion and Step in *DIRECT CYCLIC analysis:
I) I need to define some properties of damage initiation and damage evolution?
II) Is *FATIGUE CRITERION, TYPE=FATIGUE enough to model the crack propagation or i need to consider the VCCT criterion? What is difference between these methods?
Obs.: I need to consider the paris law constants
III) Is necessary to consider a *STATIC Step previously on the step of a *DIRECT CYCLIC approach in Abaqus or I can run an analysis with *DIRECT CYCLIC only?
Thanks in advance!
Yes you need damage parameters for this analysis. You can use xfem method or critical crack vcct method . In xfem you have to give damage parameters and it automatically detects the crack path. While in other you have to provide a small crack in form of a line and select it as crack.
Hello,
there is 3 clips from Manuel Ramsaier - hе explained very well the problems and maybe you will find a solution
https://www.youtube.com/watch?v=9GXppvgGmHQ&t=250s
https://www.youtube.com/watch?v=CDfwV-d4dLQ&t=16s
Hello Rajat,
The *damage initiation parameter in xfem is necessary in which type of analysis?
I) Onset of crack?
II) pre-existing crack and crack propagation (case that enables new crack surfaces from the loading acting on the crack)?
Can I use *fracture criterion, type=fatigue for evolution of a crack?
Thanks for your help!
Best regards.
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