Kenneth R. Shull

Shear wave propagation in a prestressed and transversely isotropic viscoelastic material: Inverse modeling challenges and strategies

Alexandra Vorobyeva, Qifeng Wang, Dieter Klatt, Daniel Ludvig et autres

The functional role and structure of some biological tissues, such as skeletal muscle, result in anisotropy in both material properties and imposed stresses. Dynamic elastography reconstruction methods for estimating soft tissue viscoelastic properties that are rooted in assumptions of isotropy in both …

us (code pays fourni par la source)

Materials Science and Engineering Core Curriculum

Kenneth R. Shull, Jonathan Emery

Viscoelastic Modeling of Stress Relaxation in Model High‐Performance Covalent Adaptable Networks

B.G. Lewis, Benjamin Hafner, Cheol Park, Joseph M. Dennis et autres

ABSTRACT Establishing structure–property relationships for the reprocessability of high‐performance covalent adaptable networks (CANs) is crucial for facilitating their sustainable use at scale in demanding industries like aerospace and energy. The reprocessing kinetics for a model system of high‐performance CANs (i.e., highly cross‐linked …

us (code pays fourni par la source)

Composite material homogenization for shear wave elastography of muscle-like fiber-laden viscoelastic waveguides under prestress

Lara Nammari, Dieter Klatt, Daniel Ludvig, Kenneth R. Shull et autres

us, ph (code pays fourni par la source)

Efficient Formation of a Carbohydrate-Based Polyelectrolyte Complex Gel with Macroscopic Homogeneity

Yuling Chen, Paolo Z. Ramos, Jeffrey Richards, Kenneth R. Shull

Biobased polyelectrolyte complexes (BioPECs) have attracted considerable attention due to their unique properties and potential applications in various fields. However, the processability of BioPECs often remains a challenge because of the insolubility of the solution components and of the complex itself. In …

Tailoring Architecture and Properties of Biodegradable Aliphatic-Aromatic Copolyesters via Interfacial Polymerization

Isabelle L. Behrman, Benjamin R. Hirschboeck, Daniel de Castro Assumpção, Eleanor C. Grosvenor et autres

Aliphatic-aromatic copolyesters (AAPEs) are widely used in biodegradable packaging due to their balance of thermal stability and enzymatic degradability. However, their synthesis is often hindered by time-consuming protocols, prolonged reactions, and reliance on expensive metal catalysts. Herein, we introduce stirred interfacial polymerization …

us (code pays fourni par la source)

Mechanical characterization of an incompressible, strain-hardening, transversely isotropic material

Qifeng Wang, Mahdi Ebrahimkhani, Thomas J. Royston, Eric J. Perreault et autres

A strain energy approach for the characterization of strain-hardening, transversely isotropic materials was developed and validated through a combination of indentation and uniaxial extension experiments. These experiments were utilized because they can also be applied to directly measure the mechanical properties of …

us (code pays fourni par la source)

Challenges for Implementing Polymer Gels in Defense Applications

Joseph L. Lenhart, Randy Mrozek, Kenneth R. Shull, Kathryn J. Otim

Polymer gels are soft, lightly crosslinked polymers that are highly swollen with solvent. The gel properties can be tuned by manipulating the polymer and solvent chemistry, solvent loading, polymer and solvent chain architecture, and the incorporation of various fillers and additives. This …

Allomelanin-Inspired Polyurethane Nanocomposites with Multi-Radiation Resistance and Enhanced Mechanical Properties

Lauren M. Irie, B.G. Lewis, Ashley K. Nensel, Elisabeth I. Latawiec et autres

Approaches for protecting polymeric materials against ionizing radiation are of importance for applications including in space, in aseptic medical devices, and in the nuclear industry. Allomelanin is a specific subclass of nitrogen-free melanin found to play a key role in the protection …

us (code pays fourni par la source)

Real-Time Visualization of Single Polymer Conformational Change in the Bulk State during Mechanical Deformation

Subhadeep Pal, Christopher P. Rademacher, Jie Chen, Qifeng Wang et autres

Although polymers are most often used within bulk materials, investigating their conformations and dynamics has long been a challenging endeavor in this configuration, particularly under external forces. Addressing this, we utilize single-molecule localization microscopy as a powerful imaging tool to visualize bottlebrush …

Wave propagation in prestressed and transversely isotropic viscoelastic structures: Inverse modeling challenges in elasticity imaging

Alexandra Vorobyeva, Dieter Klatt, Kenneth R. Shull, Eric J. Perreault et autres

The functional role and structure of skeletal muscle results in anisotropy in both material properties and imposed stresses, as well as waveguide effects. Dynamic elastography reconstruction methods for estimating muscle tissue viscoelastic properties that are rooted in assumptions of isotropy and bulk …

us (code pays fourni par la source)

Thermomechanical Characterization of High T g Disulfide-Containing Thermoplastic Polyimides

B.G. Lewis, Kenneth R. Shull

Covalent adaptable networks are frequently studied as alternatives to conventional thermosetting polymers because they can be recycled and reprocessed; however, the inclusion of dynamic covalent bonds within high-temperature (or high-performance) engineering thermoplastics remains largely unexplored. In this work, dynamic disulfide-containing thermoplastic polyimides …

us (code pays fourni par la source)