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Featured researches published by Paul A. Shade.


Review of Scientific Instruments | 2015

A rotational and axial motion system load frame insert for in situ high energy x-ray studies

Paul A. Shade; Basil Blank; Jay C. Schuren; Todd J. Turner; Peter Kenesei; Kurt Goetze; Robert M. Suter; Joel V. Bernier; S. F. Li; Jonathan Lind; Ulrich Lienert; Jonathan Almer

High energy x-ray characterization methods hold great potential for gaining insight into the behavior of materials and providing comparison datasets for the validation and development of mesoscale modeling tools. A suite of techniques have been developed by the x-ray community for characterizing the 3D structure and micromechanical state of polycrystalline materials; however, combining these techniques with in situ mechanical testing under well characterized and controlled boundary conditions has been challenging due to experimental design requirements, which demand new high-precision hardware as well as access to high-energy x-ray beamlines. We describe the design and performance of a load frame insert with a rotational and axial motion system that has been developed to meet these requirements. An example dataset from a deforming titanium alloy demonstrates the new capability.


Integrating Materials and Manufacturing Innovation | 2013

Experimental measurement of surface strains and local lattice rotations combined with 3D microstructure reconstruction from deformed polycrystalline ensembles at the micro-scale

Paul A. Shade; Michael A. Groeber; Jay C. Schuren; Michael D. Uchic

This article describes a new approach to characterize the deformation response of polycrystalline metals using a combination of novel micro-scale experimental methodologies. An in-situ scanning electron microscope (SEM)-based tension testing system was used to deform micro-scale polycrystalline samples to modest and moderate plastic strains. These tests included measurement of the local displacement field with nm-scale resolution at the sample surface. After testing, focused ion beam serial sectioning experiments that incorporated electron backscatter diffraction mapping were performed to characterize both the internal 3D grain structure and local lattice rotations that developed within the deformed micro-scale test samples. This combination of experiments enables the local surface displacements and internal lattice rotations to be directly correlated with the underlying 3D polycrystalline microstructure, and such information can be used to validate and guide further development of modeling and simulation methods that predict the local plastic deformation response of polycrystalline ensembles.


Review of Scientific Instruments | 2012

Stencil mask methodology for the parallelized production of microscale mechanical test samples

Paul A. Shade; Sang-Lan Kim; Robert Wheeler; Michael D. Uchic

A new methodology to parallelize the production of micromechanical test samples from bulk materials is reported. This methodology has been developed to produce samples with typical gage dimensions on the order of 20-200 μm, and also to minimize the reliance on conventional focused ion beam fabrication methods. The fabrication technique uses standard microelectronic process methods such as photolithography and deep-reactive ion etching to create high aspect ratio patterned templates-stencil masks-from a silicon wafer. In the present work, the stencil mask pattern consists of a linear row of tensile samples, where one grip of each sample is integrally attached to the bulk substrate. Once fabricated, the stencil mask is placed on top of a pre-thinned substrate, and the pattern and substrate are co-sputtered using a broad ion beam milling system, which ultimately results in the transfer of the mask pattern into the substrate. The methodology is demonstrated using a Si stencil mask and a polycrystalline Ni foil to manufacture an array of metallic micro-tensile samples.


Annual Review of Materials Research | 2009

Plasticity of Micrometer-Scale Single Crystals in Compression

Michael D. Uchic; Paul A. Shade; Dennis M. Dimiduk


Acta Materialia | 2009

A combined experimental and simulation study to examine lateral constraint effects on microcompression of single-slip oriented single crystals

Paul A. Shade; R. Wheeler; Y.S. Choi; Michael D. Uchic; Dennis M. Dimiduk; H.L. Fraser


Scripta Materialia | 2006

Application of micro-sample testing to study fundamental aspects of plastic flow

Michael D. Uchic; Dennis M. Dimiduk; Robert Wheeler; Paul A. Shade; H.L. Fraser


JOM | 2009

Micro-compression testing of fcc metals: A selected overview of experiments and simulations

Michael D. Uchic; Paul A. Shade; Dennis M. Dimiduk


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2012

Size-affected single-slip behavior of René N5 microcrystals

Paul A. Shade; Michael D. Uchic; Dennis M. Dimiduk; G.B. Viswanathan; R. Wheeler; H.L. Fraser


JOM | 2012

Insights Gained Through Image Analysis During In Situ Micromechanical Experiments

R. Wheeler; Paul A. Shade; Michael D. Uchic


Archive | 2009

Microtesting Rig with Variable Compliance Loading Fibers for Measuring Mechanical Properties of Small Specimens

Robert Wheeler; Paul A. Shade; Michael D. Uchic

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Michael D. Uchic

Air Force Research Laboratory

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Dennis M. Dimiduk

Air Force Research Laboratory

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Todd J. Turner

Air Force Research Laboratory

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Jay C. Schuren

Air Force Research Laboratory

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Michael A. Groeber

Air Force Research Laboratory

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C. Woodward

Air Force Research Laboratory

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Jonathan Almer

Argonne National Laboratory

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