A5082946410- Mechanical Behavior of Composites
- Epoxy Resin Curing Processes
- High-Velocity Impact and Material Behavior
- Fiber-reinforced polymer composites
- Injection Molding Process and Properties
- Polymer crystallization and properties
- Structural Response to Dynamic Loads
- Composite Material Mechanics
- Textile materials and evaluations
- Energetic Materials and Combustion
- Structural Behavior of Reinforced Concrete
- Composite Structure Analysis and Optimization
- Structural Analysis of Composite Materials
- Carbon Nanotubes in Composites
- Structural Analysis and Optimization
- Electronic Packaging and Soldering Technologies
- Fatigue and fracture mechanics
- Smart Materials for Construction
- Cellular and Composite Structures
- Advanced ceramic materials synthesis
- Ultrasonics and Acoustic Wave Propagation
- High voltage insulation and dielectric phenomena
- Synthesis and properties of polymers
- Force Microscopy Techniques and Applications
- Structural Load-Bearing Analysis
University of Delaware
2016-2025
Virginia Tech
2024
Monash University
2023
Institute for Legal Studies
2023
Ministry of Health
2023
University of California, Irvine
2022
Specialty Materials (United States)
2022
DEVCOM Army Research Laboratory
2009
Michigan Technological University
2009
Science Applications International Corporation (United States)
2007
We describe herein the combination of electrochemical immunosensors using single-wall carbon nanotube (SWNT) forest platforms with multi-label secondary antibody-nanotube bioconjugates for highly sensitive detection a cancer biomarker in serum and tissue lysates. Greatly amplified sensitivity was attained by featuring horseradish peroxidase (HRP) labels antibodies (Ab(2)) linked to nanotubes (CNT) at high HRP/Ab(2) ratio. This approach provided limit 4 pg mL(-)(1) (100 amol mL(-)(1)),...
A study of process-induced stress and deformation in thick-section thermosetting composite laminates is presented. methodology proposed for predict ing the evolution residual development during curing process. one- dimensional cure simulation analysis coupled to an incremental laminated plate theory model relationships between complex gradients temperature degree cure, deformation. Material models are describe mechanical properties, thermal chemical strains thermoset resin cure. These...
The end notched flexure (ENF) specimen is examined as a candidate for measuring interlaminar fracture toughness in skew symmetric loading. A simple design study sizing the ENF to minimize geometric nonlinear response and avoid material behavior or flexural failure presented. Results indicate that inter laminar shear effects may be significant tough resin systems requiring large thickness-to-length geometries. influences of deformation fric tion between crack surfaces on strain energy release...
An investigation into the two-dimensional cure simulation of thick thermosetting composites is presented. Temperature and degree distributions within arbitrary cross-sectional geometries are predicted as a function autoclave temperature history. The heat conduction equation for two-dimensional, transient anisotropic transfer coupled to kinetics composite material. A generation term, expressed rate total reaction, introduced account liberated during curing process. generalized boundary...
The moisture diffusion process of an epoxy system is studied as a function epoxy-amine stoichiometry and the resulting microstructure. Differences in behavior are related to relative importance through low-density high-density microstructural phases for different stoichiometries. Also, changes saturation level with explained by competing effects free volume versus content phase. Increasing humidity causes corresponding increase level, while increasing temperature more pronounced non-Fickian...
A macroscopic model for predicting the strength of a composite laminate containing circular notch is introduced. property, which quantifies reduction in given material or due to notch, proposed. The superposition notched data several important systems and stacking sequences achieved through development strength-radius method definition radius shift parameters, c m . allows prediction fluence sequence upon strength. In addition, laminates common stress concen tration factor shown superimpose...
A model to predict the macroscopic in-plane residual stress state of semi crystalline thermoplastic composite laminates induced by process cooling is presented. Heat transfer during processing based upon an incremental transient formulation that consists a finite difference heat analysis coupled crystallization kinetics. Micromechanics used evaluate instantaneous spatial variation mechanical prop erties as function temperature and degree crystallinity. Residual stresses are laminate theory...
The electrophoretic deposition (EPD) method was used to deposit polyethylenimine (PEI) functionalized multiwall carbon nanotube (CNT) films onto the surface of individual S-2 glass fibers. By varying processing parameters EPD following Hamaker's equation, thickness CNT film controlled over a wide range from 200 nm 2 μm. exhibited low electrical resistance, providing evidence coating uniformity and consolidation. effect on fiber matrix interfacial properties investigated through microdroplet...
Abstract The use of the atomic force microscope (AFM) to measure surface forces has been developed optimize its operation as a imaging tool. This capability can potentially be extended evaluate nanoscale material response indentation and would ideal for evaluation multi-component polymer systems, such adhesives composites. In this paper, previous work related development AFM nanoindentation device is reviewed, technique proposed which allows used probe local stiffness changes in systems....
Abstract A study to investigate the influence of processing on fusion bonding graphite (AS4) poly(etheretherketone) (PEEK) thermoplastic composites (BASF commingled PEEK/graphite NCS woven fabric) using a polyetherimide (PEI) film at interface is presented. Fundamental all processes intermolecular diffusion between surfaces in intimate contact. model based healing theory amorphous polymers has been proposed predict strength and toughness as function non‐isothermal process history. This...
The end notched flexure (ENF) specimen is employed in an investigation of the terlaminar fracture toughness Mode II (skew symmetric shear) loading unidirectional graphite/epoxy and graphite/PEEK composites. Important experimental parameters such as influence precracking data reduction scheme for are discussed. Nonlinear load-deflection response significant tough thermo plastic resin composite but also present brittle thermoset composite. ob served nonlinearities, which highly rate dependent,...
The composite tow placement process is a non-autoclave consolidation method that involves in situ and bonding of thermoplastic tape on preconsolidated substrate. It can be used as for manufacturing large structures with high degree control dimensional accuracy. bond strength develops between layers within the laminate ultimately governs final part. In this work, model presented predicting through-thickness heat transfer development based intimate contact healing at ply interface. Experiments...