CSE 8803: Materials Informatics
Fall 2017, Georgia Institute of Technology
Table of Contents
- DP Steels Post 1 - Introduction
- DP Steels Post 2 - Plan of Action
- DP Steels Post 3 - Image Segmentation, Microstructures
- DP Steel Posts 4 - 2-point Statistics of Microstructures
- DP Steels Post 5 - Principal Component Analysis of Microstructures
- DP Steels Post 6 - Segmentation of Fracture Surfaces
- DP Steels Post 7 - 2-pt Statistics of Fracture Surfaces
- DP Steels Post 8 - PCA of Fracture Surfaces
- DP Steels Post 9 - Model Building
- DP Steels Post 10 - Conclusions & Future Work
My project will be developing two-point statistics of fracture surfaces in order to quantify and distinguish between differing fracture features on a series of tensile test specimens under various magnitudes of strain rates. My goal is to relate these features and their corresponding failure mechanisms to the initial microstructure and the strain rates. This will create a process-structure linkage, in that we can consider the fracture surface to be the structure (and analyze it accordingly) and the original microstructure and rate of testing to be considered the processing resulting in the structure. All data has been generated and images taken by a member of my group, Sukanya Sharma, who has already done substantial image analysis by hand.
The material system for this project is dual-phase 980 steel – one set of samples is simply cold-rolled and the other set is galvannealed. This change in processing creates very dissimilar microstructures and therefore fracture surfaces/mechanisms, but testing results indicate very similar mechanical properties. By having analysis of both microstructure and fracture surfaces, I hope to make a connection between any mechanistic changes in fracture of the steels and the original microstructure and testing conditions.
Although automated statistical analysis of microstructures is now relatively common, fracture surfaces are much less frequently analyzed in this manner. I believe this work will be novel and possible to pursue within a semester. At the very least, it will assist Sukanya in her future work.
Fracture_Surfaces_of_Dual-Phase_Steels_Pres_1.pptx (24 MB, uploaded by Karla Wagner 3 years 9 months ago)
Fracture_Surfaces_of_Dual-Phase_Steels_Pres_2.pptx (13 MB, uploaded by Karla Wagner 3 years 9 months ago)
Fracture_Surfaces_of_Dual-Phase_Steels_Pres_3.pptx (9 MB, uploaded by Karla Wagner 3 years 8 months ago)
Fracture_Surfaces_of_Dual-Phase_Steels_Pres_4.pptx (24 MB, uploaded by Karla Wagner 3 years 7 months ago)
Presentation 4 contains narration that can be heard by selecting ‘from beginning’ in the slide show tab after opening the file.