Ph.D. student, Dillon Watring, recently published his work on the effect of additive manufacturing parameters on the fatigue-driving mechanisms in AM IN718. Dillon and his collaborators found that build orientation is linked to surface roughness, which is, in turn, linked to fatigue life. For a given build orientation, there is an optimal range of laser-energy density; outside of this range, internal defects like lack-of-fusion and secondary cracking lead to reductions in total fatigue life. To read more, check out the complete manuscript. This work is supported by an NSF CAREER award (CMMI-1752400) and by the DOD Office of Economic...
Continue readingMachine Learning Model Predicts 3D Crack Path
MMM Lab members, Kyle Pierson and Dr. Aowabin Rahman, implemented a convolutional neural network to predict the growth of a 3D crack surface and to quantify the corresponding model uncertainty. The work was supported by the Air Force Office of Scientific Research Young Investigator Program under Agreement No. FA9550-15-1-0172. Click here to access the full article....
Continue readingKaren’s paper in EFM answers long-standing question
What is the minimum volume requirement for specimens and models to guarantee representative behavior of microstructurally small cracks? Ph.D. student and NDSEG Fellow, Karen DeMille, recently published a paper in Engineering Fracture Mechanics that seeks to answer this very question. She found that the answer depends upon the microstructural arrangement near the crack front as well as the boundary conditions. Her work provides a closed-form approximation for experimentalists and modelers to quickly estimate, under certain assumptions, how much volume would be needed to guarantee that crack-front fields are converged and therefore representative of a crack in a larger structure....
Continue readingIMMI paper on generating grain-resolved foam models
Dr. Joe Tucker (Exponent) and Prof. Spear published a paper recently in the journal Integrating Materials & Manufacturing Innovation (IMMI) that describes a new capability in the widely used software DREAM.3D that allows for generating open-cell, polycrystalline metallic foams. The new capability allows users to generate completely synthetic polycrystalline foam structures, or to overlay synthetic grain structures onto 3D image data of real open-cell foams (for example, from X-ray CT). The plug-in will soon be available free to the public. To read more, click here. The work will appear in a thematic issue of IMMI on 3D Materials Science and is supported by...
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Congratulations to PhD Candidate, Brian Phung!
MMM Lab member, Brian Phung, successfully defended his PhD proposal on January 7th. He also learned, on the same day, that his first-author paper entitled “A voxel-based remeshing framework for the simulation of arbitrary three-dimensional crack growth in heterogeneous materials” was accepted for publication in the journal Engineering Fracture Mechanics. The paper will soon be available online. Great work, Brian!...
Continue readingSite-Specific Property Maps of 3D-Printed Metals
New work from the MMM Lab and collaborators describes a framework for predicting spatial variability of mechanical properties in 3D-printed metals using multi-physics modeling. The work was recently published in Modelling & Simulation in Materials Science & Engineering. The work is supported by the US Department of Defense Office of Economic Adjustment under award no. ST1605-17-02. To access the full article, click here....
Continue reading3D Grain Mapping of Open-Cell Aluminum Foam
MMM Lab and collaborators recently published an article describing experimental/synthetic data fusion to generate 3D grain maps of metal foams. Lead author, Jayden Plumb, was named the 2018 UofU Outstanding Undergraduate Researcher. Plumb is currently a Ph.D. student in Prof. Sam Daly’s lab at UC Santa Barbara. Support for the work was provided by the NSF DMREF program under grant no. CMMI-1629660. To access the full article, click here. ...
Continue readingBrian’s paper published in Engineering Fracture Mechanics
Brian Phung recently implemented a flexible numerical framework to simulate arbitrary 3D crack growth in heterogeneous materials. The framework involves adaptive remeshing on a voxel-based geometrical domain. Due to its modularity, the crack representation is de-coupled from the crack-evolution rule and material constitutive model (in the uncracked region), providing significant flexibility to investigate new or existing crack-growth criteria. The work has been published in the March 2019 issue of Engineering Fracture Mechanics. To download the article, click here or contact the MMM Lab. This work is supported by the Air Force Office of Scientific Research (AFOSR) Young Investigator Program Grant No. FA 9550-15-1-0172 and...
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