# overview
Dr. Lacy is interested in multifunctional composite materials for extreme environments, multiscale modeling, hypervelocity impacts, durability and damage tolerance.

# keywords[]
3403 Macromolecular And Materials Chemistry

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3407 Theoretical And Computational Chemistry

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3403 Macromolecular And Materials Chemistry

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3403 Macromolecular And Materials Chemistry

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0914 Resources Engineering And Extractive Metallurgy

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Thermosetting Resin And Alternative Fuel

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3407 Theoretical And Computational Chemistry

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3403 Macromolecular And Materials Chemistry

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Elastic Plastic Impact Computation (epic) Code

# educationAndTraining[].organization.label
Georgia Institute of Technology - (Atlanta, Georgia, United States)

# educationAndTraining[].organization.label
Georgia Institute of Technology - (Atlanta, Georgia, United States)

# educationAndTraining[].organization.label
University of New Mexico - (Albuquerque, New Mexico, United States)

# publications[].label
Interfacial shear strength of cured vinyl ester resin-graphite nanoplatelet from molecular dynamics simulations

# publications[].label
Effect of temperature on shear thickening fluid rheology

# publications[].label
The pursuit of hypervelocities: A review of two-stage light gas gun aeroballistic ranges

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A multiscale progressive failure modeling methodology for composites that includes fiber strength stochastics

# publications[].label
Static response of a composite wing under a whiffletree loading

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Characterization of the Effect of Material Configuration and Impact Parameters on Damage Tolerance of Sandwich Composites

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Effect of surface tension and geometry on cavitation in soft solids

# publications[].label
Development of an Experimental Setup to Analyze Carbon/Epoxy Composite  Subjected to Current Impulses

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Nonlinear constitutive equation for vapor-grown carbon nanofiber-reinforced SC-15 epoxy at different strain rate

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Viscoelastic creep compliance of a vinyl ester polymer with statistical distribution functions

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Prediction of fatigue-crack growth for 7075-T7351 aluminum alloy under various flight-load spectra

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Strain Rate Dependent Behavior of Carbon Nanofiber Filled Polypropylene

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Development of an ICME-based airframe digital twin model of an all-composite air vehicle

# publications[].label
Residual-Strength Assessment of Modified Transport Aircraft Fuselages

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Numerical modeling of impact-damaged sandwich composites subjected to compression-after-impact loading

# publications[].label
Prediction of fatigue crack growth for 7075-T7351 aluminum alloy under various flight load spectra

# publications[].label
Hypervelocity Impact Response of Polyethylene Plates

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Molecular dynamics simulations of oxidized vapor-grown carbon nanofiber surface interactions with vinyl ester resin monomers

# publications[].label
Coupled multi-inclusion and multi-coating micromechanics modeling of viscoelastic composite materials

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Computationally efficient solution of the High-Fidelity Generalized Method of cells micromechanics relations

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A historical review of the traditional methods and the internal state variable theory for modeling composite materials

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Lightning arc channel effects on surface damage development on a PRSEUS composite panel: An experimental study

# publications[].label
Creep characterization of vaporgrown carbon nanofiber/vinyl ester nanocomposites using a response surface methodology

# publications[].label
Numerical estimations of lightning-induced mechanical damage in carbon/epoxy composites using shock wave overpressure and equivalent air blast overpressure

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A multiscale modeling methodology for metal matrix composites including fiber strength stochastics

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Experimental study on thermal and mechanical properties of clay modified carbon fiber reinforced epoxy

# publications[].label
Experimental, theoretical and numerical studies on plain concrete fracture in the low-strain rate regime-A state-of-the-art review

# publications[].label
Order-reduced solution of the nonlinear high-fidelity generalized method of cells micromechanics relations

# publications[].label
Kenaf Bast Fiber BundleReinforced Unsaturated Polyester Composites. III: Statistical Strength Characteristics and Cost-Performance Analyses

# publications[].label
Molecular dynamics simulations of vinyl ester resin monomer interactions with a pristine vapor-grown carbon nanofiber and their implications for composite interphase formation

# publications[].label
Fire impact on mechanically failed graphite/epoxy composites

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Hypervelocity impact response of monolithic UHMWPE and HDPE plates

# publications[].label
Solution of the Nonlinear High-Fidelity Generalized Method of Cells Micromechanics Relations via Order-Reduction Techniques

# publications[].label
Relative Reactivity Volume Criterion for Cross-Linking: Application to Vinyl Ester Resin Molecular Dynamics Simulations

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Efficient coupling of micro/macroscale analyses with stochastic variations of constituent properties

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The Texas A&M University Hypervelocity Impact Laboratory: A modern aeroballistic range facility.

# publications[].label
Comparison of lightning protection performance of carbon/epoxy laminates with a non-metallic outer layer

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Molecular dynamics simulations of an oxidized vapor-grown carbon nanofiber and vinyl ester resin interactions leading to a possible interphase formation in the cured nanocomposite

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Numerical Estimates of the Compressive Strength of Impact-damaged Sandwich Composites

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High Strain Rate Behavior of Carbon Nanofiber Reinforced Vinyl Ester

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

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Mechanical Properties and Failure Behavior of Physically Assembled Triblock Copolymer Gels with Varying Midblock Length

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Novel Composite Space Shielding Concepts for Hypervelocity Orbital Debris Impact Mitigation

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Interfacial shear strength of a cured vinyl ester resin at graphene sheets from molecular dynamics simulations

# publications[].label
WSFE-based user-defined elements in ABAQUS for modeling 2D laminated composites with complex features

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Viscoelastic characterization of vinyl ester nano-composites using response surface modeling

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Nonlocal bending and buckling of agglomerated CNT-Reinforced composite nanoplates

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Damage Diagnostics of Composite Fan Blades Using the Modified Time Reversal Method

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Classical micromechanics modeling of nanocomposites with carbon nanofibers and interphase

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Effects of damage distribution on evolution

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Effective property estimates for composites containing multiple nanoheterogeneities

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On Representation of Damage Evolution in Continuum Damage Mechanics

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Influence of maleated polypropylene coupling agent on mechanical and thermal behavior of latania fiberreinforced PP/EPDM composites

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The Effect of Scale Dependent Discretization on the Progressive Failure of Composite Materials Using Multiscale Analyses

# publications[].publisher
American Institute of Aeronautics and Astronautics

# publications[].label
Design and Evaluation of Additively-Manufactured MMOD Satellite Shielding

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

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Thermal response of carbon fiber epoxy laminates with metallic and nonmetallic protection layers to simulated lightning currents

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Hypervelocity Impacts on Honeycomb Core Sandwich Panels Filled with Shear Thickening Fluid

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Kenaf Bast Fiber BundleReinforced Unsaturated Polyester Composites. I: Processing Techniques for High Kenaf Fiber Loading

# publications[].label
The Effect of Driver Mass and Shaft Length on Initial Golf Ball Launch Conditions: A Designed Experimental Study

# publications[].label
Dynamic mechanical analysis and optimization of vapor-grown carbon nanofiber/vinyl ester nanocomposites using design of experiments

# publications[].label
Computationally efficient High-Fidelity Generalized Method of Cells micromechanics via order-reduction techniques

# publications[].label
Molecular dynamics simulation of vinyl ester resin crosslinking

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Linkup Strength of 2024-T3 Bolted Lap Joint Panels with Multiple Site Damage

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Effective property estimates for composites containing multiple nanoheterogeneities: Part I Nanospheres, nanoplatelets, and voids

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Thermal spreading analysis of a transversely isotropic heat spreader

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Damage Resistance Characterization of Sandwich Composites Using Response Surfaces

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Strain rate effects during ultra-high strain rate penetration of polymeric materials

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Kenaf Bast Fiber BundleReinforced Unsaturated Polyester Composites. II: Water Resistance and Composite Mechanical Properties Improvement

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Ultra-Highspeed Optical Diagnostics of Water Droplet Impact, Breakup and Shock Boundary Layer Interactions of Hypervelocity Projectiles

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Validation of the Two-Parameter Fracture Criterion using 3D finite-element analyses with the critical CTOA fracture criterion

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Multiscale modeling of strength and failure behavior of carbon nanostructure reinforced epoxy composite adhesives in bonded systems

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Molecular dynamics simulations of the aggregation behaviour of overlapped graphene sheets in linear aliphatic hydrocarbons

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MHz-Rate Spectroscopic Investigation of Hypervelocity Impacts on Metal Targets

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Wavelet Spectral Finite Element Based User-Defined Element in ABAQUS for Modeling Delamination in Composite Beams

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Assessing fatigue crack growth thresholds for a Ti-6Al-4V (STOA) alloy using two experimental methods

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Designed experimental study of vapor-grown carbon nanofiber/vinyl ester nanocomposites with focus on the effects of formulation and processing factors on the nanocomposite dynamic mechanical properties over a wide temperature range

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A Comparison of Triaxially-Braided Composites Using the Generalized Method of Cells

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

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Effects of crack closure on fatigue crack-growth predictions for 2024-T351 aluminum alloy panels under spectrum loading

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Fabrication and characterization of vapor grown carbon nanofiber reinforced polyester

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Modeling Mechanical Fasteners in Single-Shear Lap Joints

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

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Lightning mechanical damage prediction in carbon/epoxy laminates using equivalent air blast overpressure

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On the development of a damage tolerance plan for multifunctional composites

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Laminate strain allowables as design parameters in teaching an introductory course on composite materials

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Viscoelastic properties of vapor-grown carbon nanofiber/vinyl ester nanocomposites

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Compression-after-impact strength estimates for finite width sandwich panels

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Determination of carbon nanofiber morphology in vinyl ester nanocomposites

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Development of an Experimental Setup to Study Carbon/Epoxy Composite Subjected to Simulated Lightning Current

# publications[].publisher
Institute of Electrical and Electronics Engineers (IEEE)

# publications[].label
Response surface predictions of the viscoelastic properties of vaporgrown carbon nanofiber/vinyl ester nanocomposites

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Using an Internal State Variable Model Framework to Investigate the Influence of Microstructure and Mechanical Properties on Ballistic Performance of Steel Alloys

# publications[].label
Effect of Suspended Particle Shapes on Shear Thickening Fluid Behavior

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Understanding lightning damage formation in a carbon-epoxy Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) composite

# publications[].label
Molecular dynamics simulations of an oxidized vapor-grown carbon nanofiber and vinyl ester resin interactions leading to a possible interphase formation in the cured nanocomposite

# publications[].label
Hybrid Boundary Element Method for Two-Dimensional Linear Elastic Fracture Analysis

# publications[].label
The Effect of Scale Dependent Discretization on the Progressive Failure of Composite Materials Using Multiscale Analyses

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Empirical Models for Predicting Two-Stage Light Gas Gun Muzzle Velocity

# publications[].label
Investigating the Composite/Metal Interface and its Influence on the  Electrical Resistance Measurement

# publications[].label
Structural Testing of an Ultralight UAV Composite Wing

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Design and Evaluation of Additively Manufactured Polyetherimide Orbital Debris Shielding for Spacecraft

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Characterization of debris cloud distribution and damage caused by hypervelocity impacts on vapor grown carbon nanofiber reinforced laminate shielding

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Micromechanically Based Effective Thermal Conductivity Estimates for Polymer Nanocomposites

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Behavior of protruding lateral plane graphene sheets in liquid dodecane: molecular dynamics simulations

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Hybrid Boundary Element Method for Two-Dimensional Linear Elastic Fracture Analysis

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

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Response surface modeling to facilitate the parametric study of transversely impacted pressurized pipelines

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On the Viability of Energy Harvesting Piezoelectric Devices for Supplemental Power Generation in Uninhabited Aircraft Systems

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Response surface study of vapor-grown carbon nanoflber/vinyl ester nanocomposites fabricated using high-shear mixing

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Evaluation of the twoparameter fracture criterion for various crack configurations made of 7075T6 aluminium alloy using finiteelement fracture simulations

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Stress intensity determination in lap joints with mechanical fasteners

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Determination of total crack free surface area creation and failure in quasi-brittle microcracking solids using 2D GraFEA simulations

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Development and validation of finite element impact models of high-density UAS components for use in air-to-air collision simulations

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Effect of Temperature on the Shear-Thickening Behavior of Fumed Silica Suspensions.

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Machine learning predictions on fracture toughness of multiscale bio-nano-composites

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Coupled thermal electrical and mechanical lightning damage predictions to carbon/epoxy composites during arc channel shape expansion

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Hypervelocity impact of honeycomb core sandwich panels filled with shear thickening fluid

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Data mining and knowledge discovery in materials science and engineering: A polymer nanocomposites case study

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Thermal response to simulated lightning currents on stitched composite aircraft structures

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Experimental study on strain rate sensitivity of aligned carbon nanofiber reinforced polypropylene

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Application of materials informatics to vapor-grown carbon nanofiber/vinyl ester nanocomposites through self-organizing maps and clustering techniques

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Experimental study of the dynamic mechanical properties of vapor-grown carbon nanofiber/vinyl ester nanocomposites fabricated using coupled high-shear mixing and ultrasonication

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Gradient concepts for evolution of damage

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Effective property estimates for composites containing multiple nanoheterogeneities: Part II nanofibers and voids

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Volume IV: UAS Airborne Collision Severity Evaluation: Engine Ingestion

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Experimental characterization and constitutive modeling of an aluminum 7085-T711 alloy under large deformations at varying strain rates, stress states, and temperatures

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A char removal protocol to visualize fiber crosssections of carbon/epoxy composites subjected to flame

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Mechanical characterization of novel latania natural fiber reinforced PP/EPDM composites

# publications[].label
A Multiscale Modeling Methodology for Metal Matrix Composites Including Fiber Strength Stochastics

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Molecular dynamics simulations of the graphene sheet aggregation in dodecane

# publications[].label
Experimental study on the mechanical behavior of carbon/epoxy composites with a carbon nanofiber-modified matrix

# publications[].label
Creep compliance characterization of vapor-grown carbon nanofiber/vinyl ester nanocomposites using a central composite design of experiments

# publications[].label
Micromechanical modeling of nanoreinforced composites with carbon nanofibers and interphase

# publications[].label
Kenaf Bast Fiber BundleReinforced Unsaturated Polyester Composites. IV: Effects of Fiber Loadings and Aspect Ratios on Composite Tensile Properties

# publications[].label
Response surface characterization of the mechanical behavior of impact-damaged sandwich composites

# publications[].label
A statistical approach to characterize the viscoelastic creep compliances of a vinyl ester polymer

# publications[].label
Molecular dynamics simulations of vinyl ester resin crosslinking

# publications[].label
The effect of fiber strength stochastics and local fiber volume fraction on multiscale progressive failure of composites

# publications[].label
Anisotropic Nanoparticles Contributing to Shear-Thickening Behavior of Fumed Silica Suspensions.

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Artificial lightning strike tests on PRSEUS panels

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Effects of Moulding Condition and Curing Atmosphere on the Flexural Properties of Vinyl Ester

# publications[].label
Investigation of failure behavior of a thermoplastic elastomer gel.

# publications[].label
Mechanical Characterization of Nanofiber Enhanced Polymer with Application to Composite Crush Tubes

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Stress intensity determination in lap joints with mechanical fasteners

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Creep characterization of vinyl ester nano-composites using the digital image correlation technique

# publications[].label
Development of an experimental setup to analyze carbon/epoxy composite subjected to current impulses

# publications[].label
Hypervelocity Impacts of Shear Thickening Fluid Imbibed Metallic Foam Core Sandwich Panels

# publications[].label
Application of Digital Particle Tracking and Schlieren Imaging to Study Debris Cloud and Shockwave Formation During Hypervelocity Impacts

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Effects of alternative jet fuel blends on aerospace-grade carbon/epoxy composites

# publications[].label
Comparison of Residual Strength Estimates for Bolted Lap-Joint Panels

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Relative Reactivity Volume Criterion for Cross-Linking: Application to Vinyl Ester Resin Molecular Dynamics Simulations

# publications[].label
Statistical characterization of the impact strengths of vaporgrown carbon nanofiber/vinyl ester nanocomposites using a central composite design

# publications[].label
Mechanics of hypervelocity simultaneously launched distributed particles br

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Heat deflection temperatures of bio-nano-composites using experiments and machine learning predictions

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Effect of strain rate on tensile behavior of polypropylene and carbon nanofiber filled polypropylene

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Effects of cyclic absorption-desorption of model fuels by aerospace-grade carbon/epoxy composites

# publications[].label
Fatigue and crack-growth behavior in a titanium alloy under constant-amplitude and spectrum loading

# publications[].label
Creep Compliance Characterization of Vapor-Grown Carbon Nanofiber/Vinyl Ester Nanocomposites Using a Central Composite Design of Experiments

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Temperaturedependent thermal decomposition of carbon/epoxy laminates subjected to simulated lightning currents

# publications[].label
Comprehensive mechanical property classification of vapor-grown carbon nanofiber/vinyl ester nanocomposites using support vector machines

# publications[].label
Structural Analysis and Testing of an Ultralight Unmanned-Aerial-Vehicle Carbon-Composite Wing

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Material Property Estimations and Comparisons of Nano-Reinforced Polymer Composites Using Classical Micromechanics and the Generalized Method of Cells

# publications[].publisher
American Institute of Aeronautics and Astronautics (AIAA)

# publications[].label
Characterization, prediction, and optimization of flexural properties of vaporgrown carbon nanofiber/vinyl ester nanocomposites by response surface modeling

# publications[].label
UAS Airborne Collision Severity Evaluation: Executive Summary  Structural Evaluation