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Article
Creep Characterization of Amorphous SiO2 in the Transmission Electron Microscope Using Digital Image Correlation and Finite Element Analysis
Amorphous silica (a-SiO2) exhibits creep behavior under electron beam irradiation in the transmission electron microscope (TEM) even at room temperature. This effect is invariably present during in situ TEM micro...
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Article
On the Importance of Direct-Levelling for Constitutive Material Model Calibration using Digital Image Correlation and Finite Element Model Updating
Finite element model updating (FEMU) is an inverse technique that is used to identify material (constitutive) model parameters based on experimental data. These experimental data, often in the form of full-fie...
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Article
Effect of Confinement on the Impact Response of a Granular Array
Plastic dissipation at inter-granular contacts during elasto-plastic wave propagation plays a significant role in wave attenuation. However, it is unknown if plastic dissipation during impact is enhanced if th...
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Article
Machine Learning Neural-Network Predictions for Grain-Boundary Strain Accumulation in a Polycrystalline Metal
Microstructural features such as grain boundaries play a significant role in the macroscopic plastic response of polycrystalline metals. However, a quantitative link between plastic strain accumulation at grai...
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Article
Open AccessDynamic Response of a Thermally Stressed Plate with Reinforced Edges
Conditions in hypersonic flight generate non-uniform temperature distributions that affect the performance and longevity of aircraft components. Historically, a limited amount of experimental work has been per...
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Article
Experimental Validation of an Additively Manufactured Stiffness-Optimized Short-Fiber Reinforced Composite Clevis Joint
This effort describes experiments for the validation of the response of an additively manufactured stiffness-optimized short-fiber reinforced composite. A Direct Ink Write (DIW) method is used to additively ma...
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Article
Loading Orientation Effects on the Strength Anisotropy of Additively-Manufactured Ti-6Al-4V Alloys under Dynamic Compression
The microstructure of additively-manufactured metals depends on the direction of build, and is distinctly different from those of conventional metals. This work examines the effect of strain rate, heat treatme...
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Article
Importance of Exposure Time on DIC Measurement Uncertainty at Extreme Temperatures
Digital Image Correlation (DIC) is a popular optical method for deformation and strain measurement. At extreme temperatures, it is known that materials emit light in addition to reflecting the light supplied b...
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Article
Three-Dimensional Study of Graphite-Composite Electrode Chemo-Mechanical Response using Digital Volume Correlation
A custom built reusable cell for in situ lithiation and mechanical deformation studies while in an X-ray tomograph was demonstrated, and the strain and volume changes of a composite graphite anode were computed f...
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Article
A Parametric Study on the Influence of Internal Speckle Patterning for Digital Volume Correlation in X-Ray Tomography Applications
Use of the Digital Volume Correlation (DVC) technique has grown steadily in the mechanics community as a way of quantifying internal mechanical response of complex microstructures under loading. The DVC techni...
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Article
Open AccessHigh Temperature Vibratory Response of Hastelloy-X: Stereo-DIC Measurements and Image Decomposition Analysis
The mechanical behavior of solids in combined high-temperature and vibratory environments, such as those experienced during hypersonic flight, are historically not well explored. In this work on Hastelloy-X pl...
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Article
Ultra-high Speed Imaging of Laser-Induced Spallation
In this work real-time images of the initiation and arrest of a laser-induced substrate spallation event have been captured over its ~40 ns duration using ultra-high speed photography. A modified version of th...
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Article
Subset Refinement for Digital Volume Correlation: Numerical and Experimental Applications
Digital image correlation (DIC) metrology has gained significant popularity over the past few decades because of its ease of use and reliable displacement measurement. Unlike other optical methods, such as for...
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Article
An Experimental Study of the Dynamic Elasto-Plastic Contact Behavior of Dimer Metallic Granules
Studying the dynamic elasto-plastic contact behavior of dimer metallic granules, defined as contacting beads of either different size or material, is important for understanding the behavior of heterogeneous g...
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Article
Crack Path Selection in Microstructurally Tailored Inhomogeneous Polymers
In this work the photodegradation of a polyethylene co-polymer, ECO, is exploited to generate inhomogeneous arrangements of model “granular” media that aids in the experimental study of crack path selection pr...
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Article
Spatiotemporal Thermal Inhomogeneities During Compression of Highly Textured Zirconium
Using a focal plane array infrared camera, the heat generated during large strain compression (at a rate of 1 s−1) is used to study the characteristics of plastic flow for hcp zirconium. Heat generation during pl...
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Article
Towards High Performance Digital Volume Correlation
We develop speed and efficiency improvements to a three-dimensional (3D) digital volume correlation (DVC) algorithm, which measures displacement and strain fields throughout the interior of a material. Our goa...
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Chapter and Conference Paper
Experimental and Numerical Study of Wave Propagation in Granular Media
One dimensional stress waves travelling in granular chains exhibit interesting characteristics such as filtering, tunability and wave mitigation because on the formation of solitary waves, and solitary wave tr...
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Article
Digital Image Correlation for Improved Detection of Basal Cell Carcinoma
Border detection is a critical aspect during removal of a basal cell carcinoma tumor. Since the tumor is only 3% to 50% as stiff as the healthy skin surrounding it, strain concentrates in the tumor during defo...
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Article
A Hybrid Experimental/Numerical Investigation of the Response of Multilayered MEMS Devices to Dynamic Loading
In order to probe the mechanical response of microelectromechanical systems (MEMS) subjected to dynamic loading, a modified split Hopkinson pressure bar was used to load MEMS devices at accelerations ranging f...
