Nitinol Devives & Components, Inc
Resources related to strain amplitude volume fraction method for evaluating nitinol fatigue durability.
SMST_2014_Volume_Fraction.pdf Stain Amplitude Volume Fraction Method for Evaluation of Nitinol Fatigue Durability presentation from SMST-2014 explaining the method, using the resources available here.
Step_By_Step_Volume_Fraction.pdf Detailed explanation of the process used to generate volume fraction data from a set of metallographic cross section images.
Sample_Image.jpg A sample metallographic cross section. The scale of this image is 500x. 250 pixels = 500 microns.
Results_from_ImageJ_Particle_Analysis.txt Results exported from ImageJ, after importing Sample_Image.jpg, applying a default threshold setting to isolate inclusions, and applying "analyze particles" to quantify the number of inclusions. ImageJ saves this data with a default extension of .XLS, but the format is actually just a tab deliniated text file.
2014_Sample_Data.jmp JMP data table containing the sample data from above, plus some additional columns to calculate area, volume, and histogram information. (JMP 10.0 http://jmp.com 30-day trial available)
SMST_2014_data.xlsx All of the raw data, summary tables, calculations, and charts included in the presentation. Includes both the material analysis, and strain amplitude data from the FEA example.
Abaqus_6.12-1_Example.inp Abaqus input deck used to generatre the FEA sample data used in the presentation.
ivol.py Python script using Abaqus API's to detect and measure regions of the model having a strain amplitude exceeding a specified threshold.
Thanks for Payman Saffari, Payam Saffari, Karthik Sentilnathan, Scott Robertson, and Scott Schlegel for their contributions to this research.
These materials are publicly shared under the permissive terms of the MIT license. Suggestions and improvements are welcomed, and attribution is appreciated. Please credit NDC, and link to https://github.com/cbonsig/strain-amplitude-volume-fraction. Please use the "Issues" panel for comments and suggestions .
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