Thomas E. Lacy
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View article: Implementation of compound refractive lenses for large field-of-view x-ray phase-contrast imaging during hypervelocity impact experiments
Implementation of compound refractive lenses for large field-of-view x-ray phase-contrast imaging during hypervelocity impact experiments Open
Synchrotron x-ray phase-contrast imaging (XPCI) offers time-resolved visualization of dynamic compression phenomena, but its intrinsically small field-of-view (FOV) limits the time that key features remain in frame. A novel approach to enl…
Review of machine learning applications for defect detection in composite materials Open
Machine learning (ML) techniques have shown promising applications in a broad range of topics in engineering, composite materials behavior analysis, and manufacturing. This paper reviews successful ML implementations for defect and damage …
View article: Polyethylene’s Response to Hypervelocity Impacts at Critical Transition Temperatures
Polyethylene’s Response to Hypervelocity Impacts at Critical Transition Temperatures Open
All spacecraft continue to face a growing risk of hypervelocity impact (HVI) by micrometeoroids and orbital debris (MMOD). Concurrently, emerging hypersonic weapons pose acute ballistic threats to military and civilian assets. In both case…
View article: Ballistic Limit Velocity and Impact Energy Absorption from Microns to Millimeters
Ballistic Limit Velocity and Impact Energy Absorption from Microns to Millimeters Open
The Laser-Induced Particle Impact Test (LIPIT) can be used to probe projectile, target, and synergistic projectile-target responses under high strain rate deformation at the microscale. LIPIT’s advantages over other microscale launching te…
View article: Temperature Dependence of the Hypervelocity Impact Response of Polyethylene Plates from Tg to Tm
Temperature Dependence of the Hypervelocity Impact Response of Polyethylene Plates from Tg to Tm Open
All spacecraft continue to face a growing risk of hypervelocity impact (HVI) by micrometeoroids and orbital debris (MMOD). Concurrently, emerging hypersonic weapons pose acute ballistic threats to military and civilian assets. In both case…
View article: Size Matters: Impact Energy Absorption Across Five Decades of Length Scale
Size Matters: Impact Energy Absorption Across Five Decades of Length Scale Open
The Laser-Induced Particle Impact Test (LIPIT) can be used to probe projectile, target, and synergistic projectile-target responses to high strain rate deformation at the microscale. LIPIT’s advantages over other microscale launching techn…
Empirical Models for Predicting Two-Stage Light Gas Gun Muzzle Velocity Open
Two-stage light gas guns (2SLGGs) can reliably accelerate projectiles to velocities between 1.5-8.0+ km/s and are used in hypervelocity impact, aerospace, and hypersonic research. 2SLGG operation involves a variety of physical phenomena in…
Simulating Hypervelocity Impacts to Monolithic High-Density Polyethylene Plates Open
Thermoplastic polymers as intermediate layers in protective structures could offer hypervelocity impact (HVI) damage resistance without compromising on weight and cost. Moreover, the ability to accurately simulate the ultra-high strain rat…
Using an Internal State Variable Model Framework to Investigate the Influence of Microstructure and Mechanical Properties on Ballistic Performance of Steel Alloys Open
An internal state variable (ISV)-based constitutive model has been used within a Lagrangian finite element analysis (FEA) framework to simulate ballistic impact of monolithic rolled homogenous armor (RHA) steel plates by RHA steel spheres …
Effects of alternative jet fuel blends on aerospace-grade carbon/epoxy composites Open
The effects of Jet A fuel and four alternative fuel blends on different carbon/epoxy composites were investigated. The alternative fuel blends consisted of 50/50 or 90/10 vol% blends of Jet A fuel with low aromatic content non-petroleum so…
Investigating the Composite/Metal Interface and its Influence on the Electrical Resistance Measurement Open
The advantages introduced by carbon fiber reinforced polymer (CFRP) composites has made them an appropriate choice in many applications and an ideal replacement for conventional materials. The benefits using CFRP composites are due to thei…
View article: Solution of the Nonlinear High-Fidelity Generalized Method of Cells Micromechanics Relations via Order-Reduction Techniques
Solution of the Nonlinear High-Fidelity Generalized Method of Cells Micromechanics Relations via Order-Reduction Techniques Open
The High-Fidelity Generalized Method of Cells (HFGMC) is one technique, distinct from traditional finite-element approaches, for accurately simulating nonlinear composite material behavior. In this work, the HFGMC global system of equation…
View article: Anisotropic Nanoparticles Contributing to Shear-Thickening Behavior of Fumed Silica Suspensions
Anisotropic Nanoparticles Contributing to Shear-Thickening Behavior of Fumed Silica Suspensions Open
Rheological characteristics of a concentrated suspension can be tuned using anisotropic particles having various shapes and sizes. Here, the role of anisotropic nanoparticles, such as surface-functionalized multiwall carbon nanotubes (MWNT…
View article: Order-Reduced Solution of the Nonlinear High-Fidelity Generalized Method of Cells Micromechanics Relations
Order-Reduced Solution of the Nonlinear High-Fidelity Generalized Method of Cells Micromechanics Relations Open
The High-Fidelity Generalized Method of Cells (HFGMC) is one technique for accurately simulating nonlinear composite material behavior. The HFGMC uses a higher-order approximation for the subcell displacement field that allows for a more a…
Development of an Experimental Setup to Analyze Carbon/Epoxy Composite Subjected to Current Impulses Open
In this paper, variation in electrical properties of CFRP caused by relatively low magnitude current impulses discharged through CFRP coupons are reported, and internal changes of the composite, due to current impulses, are studied. Based …