3D Elastic-plastic Fracture Simulation

Simulation of 3D ductile tearing in an Arcan specimen (Mode I loading). Model is adaptively remeshed at each increment of crack growth. If you are interested in how to do one of these simulations, please visit my website: http://www.cfg.cornell.edu/~ads259/index_files/RecentResearch.htm

Category:

Science & Technology

Tags:

• computational
• fracture
• mechanics

[skyflashings]

Very nice video TheAspear! I am trying to simulate fracturing myself and have a quick question on getting started: How are you modeling the mesh? I've tried looking at software packages like netgen/gmsh, but I'm not sure how to build a data structure for the mesh file that they output. Do I just store a series of 4-point tetrahedron and somehow find which ones are neighbors? I would appreciate any direction!

[TheAspear]

Hi @skyflashings -- I am not familiar with netgen/gmsh. These simulations were done using a combination of ABAQUS, FRANC3D (a crack growth prediction and remeshing code), and python scripts that I wrote to sort of interface between the two. I have uploaded the python scripts, support modules, a tutorial, and some example input files (to give you an idea of the file format that ABAQUS uses). The link to my website is in the video description above. Good luck. :)

[lordpoee]

@TheAspear Okay cool, thanks again!

[TheAspear]

@lordpoee Ok, I just put the link to my website in the video description above.

[lordpoee]

@TheAspear hmmm (cfg.cornell.edu) does not appear to be valid...

[lordpoee]

@TheAspear Cool, I'll check it out now :)

[TheAspear]

@lordpoee I just uploaded the python scripts, support modules, and a tutorial on my website for doing these kinds of simulations (cfg.cornell.edu/~ads259/index­_files/RecentResearch.htm). You need access to ABAQUS and FRANC3D (and a lot of patience :) to actually run the scripts, but you can always read through the python scripts and get a general sense of the computational work flow involved in using adaptive remeshing and material state mapping for 3D crack growth simulations.

[TheAspear]

More detailed information (including computer codes/scripts) regarding the method we used to perform the 3D elastic-plastic tearing simulations can be found in the following document located on NASA's technical report server: "Surrogate Modeling of High-Fidelity Fracture Simulations for Real-Time Residual Strength Predictions", January 2011, Spear et al.

[lordpoee]

@lordpoee Like say, are you using the Holloman equation?

[lordpoee]

@TheAspear Could you post your input data and stress formulas?