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Free Webinar Series - Best Practice in Advanced Modelling of Materials in the USA

Materials Knowledge Transfer Network (KTN) : 12 November, 2012  (Special Report)
The Materials KTN is running a series of three free webinars delivered by US leaders in the field of advanced modelling of materials.
Free Webinar Series - Best Practice in Advanced Modelling of Materials in the USA

The mid-west region of the USA is recognised as world-leading for advanced modelling of materials. Driven by aerospace and defence industries, this region is internationally renowned for its skills and expertise for developing and validating materials models on a range of length scales, from atomic-scale modelling to continuum mechanics.

The three webinars, which will take place on 16 and 29 November and 13 December, will be delivered by presenters from NASA Glenn Research Centre, Arizona State University, GE Aviation and Ohio State University.

Presenter Organisation Title/Register LInk Date Time
Dr Steven Arnold and Dr. Kuang C. Liu NASA Glenn Research Centre and Arizona State University The Multiscale Generalized Method of Cells and its Utility in Predicting the Deformation and Failure of Woven CMCs Friday 16 November 2012 16.00-16.45 GMT

Dr Shesh Srivatsa

GE Aviation Modelling Applications to Aero Engine Components

Thursday 29th November 2012

16.00-16.45 GMT

Prof Wolfgang Windl

Ohio State University Multiscale Modelling of Metastable Metals Thursday 13th December 2012

16.00-16.45 GMT

The Multiscale Generalized Method of Cells and its Utility in Predicting the Deformation and Failure of Woven CMCs

Multiscale Generalized Method of Cells and its Utility in Predicting the Deformation and Failure of Woven CMCsIt is well known that failure of a material is a locally driven event. In the case of ceramic matrix composites (CMCs), significant variations in the microstructure of the composite exist and their significance on both deformation and life response at various levels of scale need to be assessed. Examples of these variations include changes in the fibre tow shape, tow shifting/nesting and voids within and between tows. In the present work, the effects of many of these architectural parameters and material scatter of woven ceramic composite properties at the macroscale (woven RUC) and structural scale will be studied to assess their sensitivity. The recently developed Multiscale Generalized Method of Cells methodology is used to determine the overall deformation response, proportional elastic limit (first matrix cracking), and failure under tensile loading conditions of both five harness stain weave (5HS) and plain weave (PW) composites. The macroscale responses investigated illustrate the effect of architectural and material parameters on a single 5HS and PW RUC  as well as multiple combinations of PW RUCs in order to simulate the structural scale. Results shows that the most critical architectural parameter is weave void shape and content with other parameters being less in severity. Gaussian distributions of multiple architectural features are also examined to identify the stochastic influence of the local material variability on the overall features of the composite stress-strain response. Statistical analysis demonstrated the linear elastic range was insensitive to architectural variation as compared to the damaged regime. Similarly, the structural scale simulations had more variance than the macroscale due to the local nature of failure.

Dr. Steven M. Arnold is Chief of the Mechanics and Life Prediction Branch within the Structures and Materials Division at NASA Glenn Research Center, where he conducts research involving theoretical and experimental investigations of structural material behaviour of advanced aircraft propulsion systems and spacecraft structures.  His primary emphasis is on the development of advanced high temperature viscoelastoplastic deformation and damage constitutive models, and the associated multi-scale design and analysis computational tools required to make these models accessible to the engineering community. Arnold's research activities have resulted in the development and commercialization of numerous computational tools: the most notable being the award winning micromechanics analysis code MAC/GMC; a non-linear hardening, multi-mechanism, potential based, unified viscoelastoplastic model (GVIPS); a novel parameter optimisation code, COMPARE (which allows “fully automated” characterisation of the GVIPS model) and over 280 technical publications, 83 of which are journal publications. He is also the author of two US Patents and co-founder and chairman of the Material Data Management Consortium (MDMC) and director of MACE, NASA Glenn’s Multiscale Analysis Center of Excellence.

Dr. Kuang C. Liu is based at Arizona State University, Tempe, AZ.

Modelling Applications to Aircraft Engine Components

Modelling Applications to Aero Engine ComponentsThis presentation will describe the application of process modelling in the manufacturing of critical aircraft engine rotating components. With parts getting larger in size and processing windows for new materials getting tighter, modelling is a key tool in making new parts in a cost and time effective manner with improved quality and properties. Today, modelling is a key factor in "making right the first time" parts of size/shape/materials for which there is no prior experience. Generation of modelling inputs (material property data and boundary conditions) and validation of outputs will also be discussed.

Dr Shesh Srivatsa has worked in the Materials and Process Engineering Department at GE Aviation for 28 years.  His areas of interest include modeling of various manufacturing processes. He has led several USAF funded programs related to the development and application of modelling tools.
 
Multiscale Modelling of Metastable Metals

Multiscale Modelling of Metastable MetalsThis webinar delivered by Prof Wolfgang Windl of Ohio State University will explore multiscale modelling of metastable metals.  Windl’s research focuses on the field of computational materials, chiefly on simulations of atomic-level structures and their properties. Since modelling methods on the atomic level are rather universal, independent of what kind of material the atoms form, the materials systems that his group studies span a wide range. Current projects examine the deformation behaviour of amorphous metals (so-called “bulk metallic glasses”); the effect of irradiation on silicon carbide materials and fibreoptic cables in a nuclear environment; half-metallic double perovskites; and spin-lifetimes and carrier mobilities in spintronics materials.  Since atomic-level simulations can only predict realistic behaviour of materials if they are performed for a sensible, realistic arrangement of atoms, Windl works primarily on team projects in collaboration with experimental groups that help with the definition of the modelling tasks and their validation.

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