Design, Evaluation and Experimental Effort Toward Development of a High Strain Composite Wing for Navy Aircraft

This design development effort addressed significant technical issues concerning the use and benefits of high strain composite wing structures (Epsilon(sub ult) = 6000 micro-in/in) for future Navy aircraft. These issues were concerned primarily with the structural integrity and durability of the innovative design concepts and manufacturing techniques which permitted a 50 percent increase in design ultimate strain level (while maintaining the same fiber/resin system) as well as damage tolerance and survivability requirements. An extensive test effort consisting of a progressive series of coupon and major element tests was an integral part of this development effort, and culminated in the design, fabrication and test of a major full-scale wing box component. The successful completion of the tests demonstrated the structural integrity, durability and benefits of the design. Low energy impact testing followed by fatigue cycling verified the damage tolerance concepts incorporated within the structure. Finally, live fire ballistic testing confirmed the survivability of the design. The potential benefits of combining newer/emerging composite materials and new or previously developed high strain wing design to maximize structural efficiency and reduce fabrication costs was the subject of subsequent preliminary design and experimental evaluation effort

Dixmier traces on noncompact isospectral deformations

We extend the isospectral deformations of Connes, Landi and Dubois-Violette to the case of Riemannian spin manifolds carrying a proper action of the noncompact abelian group $R^l$. Under deformation by a torus action, a standard formula relates Dixmier traces of measurable operators to integrals of functions on the manifold. We show that this relation persists for actions of $R^l$, under mild restrictions on the geometry of the manifold which guarantee the Dixmier traceability of those operators.Comment: 30 pages, no figures; several minor improvements, to appear in J. Funct. Ana

Applications of fibrous substrates containing insolubilized phase change polymers

Incorporation of polyethylene glycols into fibrous substrates produces several improved functional properties when they are insolubilized by crosslinking with a methylolamide resin or by polyacetal formation by their reaction with glyoxal. The range of molecular weights of polyols that may be insolubilized is broad as are the curing conditions (0.25-10 min at 80-200C). Most representative fiber types and blends (natural and synthetic) and all types of fabric constructions (woven, nonwoven and knit) have been modified by incorporation of the bound polyols. The most novel property is the thermal adaptability of the modified substrates to many climatic conditions. This adaptability is due to the high latent heat of the crosslinked polyols that function as phase change materials, the hydrophilic nature of the crosslinked polymer and its enhanced thermal conductivity. Other enhanced properties imparted to fabrics include flex and flat abrasion, antimicrobial activity, reduced static charge, resistance to oily soils, resiliency, wind resistance and reduced lint loss. Applications commercialized in the U.S. and Japan include sportswear and skiwear. Several examples of electric sets of properties useful for specific end uses are given. In addition, other uses are biomedical horticultural, aerospace, indoor insulation, automotive interiors and components and packaging material

Safety Improvements at Horizontal Curves

This presentation highlights the progress INDOT has made in improving safety at horizontal curves by upgrading the signing and delineation and by applying high friction surface treatments at some locations. We will also discuss the MUTCD (Manual on Uniform Traffic Control Devices) requirements for signing horizontal curves and the approaching (December 31, 2019) FHWA target date for compliance

Specifications for Intersection Conflict Warning Systems

This presentation summarizes the construction and material specifications used for a deployment of intersection conflict warning systems at 18 two-way stop controlled intersections on the state highway system. The presentation also includes information on the draft MUTCD language for intersection conflict warning systems

INDOT Signing - Recent Developments for Attraction Signs

Summary of INDOT\u27s policy on attraction signing and tips for addressing attraction signs in design plan development for INDOT road projects. Presented at Purdue University Road School on March 9, 2016

High Friction Surface Treatment Initiatives by INDOT: Spec Development

In-House Project Design, Special Provision Specification, and Initial Test Results—Highfriction surface treatment (HFST) has been proactively utilized as a cost-effective solution to reducing vehicle crashes at curves across the country. As an initiative, INDOT is currently installing HFST at 26 locations statewide, mainly horizontal curves with high crash rates. This session consists of two presentations to share the information on the development, expected benefits, project design, and initial test results based on the HFST at these locations

Incorporating ADA and APS Work on Traffic Contracts: Design Guidance and Construction Standards

The presentation provides an overview of the Indiana Department of Transportation\u27s design guidance and construction standards on curb ramps and accessible pedestrian signals. The presentation also summarizes the Indiana Department of Transportation\u27s policy on when existing curb ramps and pedestrian pushbuttons must be upgraded as part of a traffic construction contract and when an upgrade is optional

Pavement Marking Updates

Significant changes to pavement markings are under- way to improve the safety and service life of roads and to assist vehicles with lane departure warning systems. This presentation will provide an update on changes to the Indiana Design Manual, Standard Specifications, and Standard Drawings for the use of 6-in. lines as the normal line width, RPM usage and spacing changes, and increasing the use of durable marking materials. The presentation will also include other pavement marking topics, such as contrast markings and orange pavement markings for work zones