Person:
McDowell, David L.

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South Big Data Innovation Hub 2019 All Hands Meeting - Panel 1: South Hub Priority Areas

2019-04-09 , Aikat, Jay , Bradley, Heather , Fiore, Stephen , Marathe, Madhav , McDowell, David L.

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Modeling of small fatigue cracks in low SFE microstructures

2011-04 , McDowell, David L. , Padbidri, Jagan

Nuclear reactor pressure vessels are manufactured from high strength steels like A302B. The inner surface of the pressure vessel is exposed to extremely corrosive environments at high temperatures. The pressure vessels are therefore clad with corrosion resistant materials such as austenitic stainless steel. However, the manufacturing process results in defects in the clad material and the clad/base material interface. These defects are subject to fatigue loading due to the pressurization/shutdown cycles of the pressure vessel during service resulting in fatigue crack formation and growth from the defects. Here, we focus on the formation and growth of a fatigue crack from a surface defect in the cladding material to the base metal that could lead to exposure of the base metal to the corrosive environment in the pressure vessel and subsequent failure. To quantify the crack propagation rate from these defects under cyclic loading conditions, a Short crack growth (ShCGr) model has been developed by Dr. Clint Geller of the Bettis Atomic Power Laboratory (BAPL). The ShCGr model employs the concept of an accumulating debris field associated with the irreversibility attributed to dislocations encountering obstacles to their motion over a number of loading cycles; this contributes to stress intensification at the crack tip.The model uses an irreversibility factor to account for the damage accumulation. The number of cycles required for crack extension is found from energy balance between the free energy change associated with creating a crack and the energy released by a dislocation pile-up when a crack is created. The model is able to correlate crack initiation lives in smooth specimens through certain assumptions.

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Physics-based prognostic tools for fatigue and creep-fatigue of propulsion system materials

2007-12-01 , McDowell, David L.

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Path history dependence & multiaxial generalization of constitutive equations for shape memory alloys

1997-04 , McDowell, David L.

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Data Infrastructure for Materials and Advanced Manufacturing Workshop : Welcome Address

2016-08-25 , Aluru, Srinivas , McDowell, David L. , Rawlings-Goss, Renata

The goal of this workshop is assess and deliberate on the current state of the data infrastructure supporting the accelerated insertion of new and advanced materials into commercial products. For this purpose, we have attempted to convene diverse stakeholders involved in this emerging f1eld, including industry, academia, national laboratories, and nonprofits, whose expertise cuts across several traditional disciplines such as materials science and engineering, design and manufacturing sciences, and computer and data sciences. Speakers have been specifically selected to share their perspective on high-impact applications or challenges surrounding the use of Data Science and Informatics in the Materials and Advanced Manufacturing space. Attendees will come from academic research institutions across the 16 states that comprise the South Big Data Innovation Hub. Participants will engage in active scoping and round-table discussions in order to build partnerships across high-impact application verticals.

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Novel methods for microstructure-sensitive probabilistic fatigue notch in IN100

2010-12-31 , McDowell, David L. , Musinski, William

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(STTR) Adaptive materials for morphing aircraft skins

2007-08-05 , Gall, Ken , Campbell, Douglas , Lesniewski, Martha , McDowell, David L. , Di Prima, Matthew Allen , Sanderson, Terry

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DEN fatigue testing

2011-05-02 , McDowell, David L.

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Microstructure and 3-D effects in fretting fatigue of Ti alloys and Ni-base superalloys

2008-08-01 , Neu, Richard W. , McDowell, David L.

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Internal state variable models for rate and temperature dependent behavior at finite strain

1998 , McDowell, David L.

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