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Intermediate Temperature Carbon - Carbon Composite Structures. CRADA Final Report

Description: The objective of this Cooperative Research and Development Agreement (CRADA) between UT-Battelle, LLC (the "Contractor") and Synterials, Inc. (the "Participant") was to demonstrate promising processing methods, which can lead to producing Carbon-Carbon Composites (CCC), with tensile and interlaminar properties comparable to those of organic matrix composites and environmental stability at 1200 F for long periods of time. The participant synthesized carbon-carbon composites with two different fi… more
Date: June 1, 2007
Creator: Lara-Curzio, Edgar
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Behavior of Concrete Panels Reinforced with Synthetic Fibers, Mild Steel, and GFRP Composites Subjected to Blasts

Description: The paper presents experimental data generated for calibrating finite element models to predict the performance of reinforced concrete panels with a wide range of construction details under blast loading. The specimens were 1.2 m square panels constructed using Normal Weight Concrete (NWC) or Fiber Reinforced Concrete (FRC). FRC consisted of macro-synthetic fibers dispersed in NWC. Five types of panels were tested: NWC panels with steel bars; FRC panels without additional reinforcement; FRC pan… more
Date: March 1, 2012
Creator: Pantelides, C. P.; Garfield, T. T.; Richins, W. D.; Larson, T. K. & Blakeley, J. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Creep of Structural Nuclear Composites

Description: A research program has been established to investigate fiber reinforced ceramic composites to be used as control rod components within a Very High Temperature Reactor (VHTR) design. Two candidate systems have been identified, carbon fiber reinforced carbon (Cf/C) and silicon carbide fiber reinforced silicon carbide (SiCf/SiC) composites. One of the primary degradation mechanisms anticipated for these core components is high temperature thermal and irradiation enhanced creep. As a consequence, h… more
Date: September 1, 2005
Creator: Windes, Will & Lloyd, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Roadmap to NRC Approval of Ceramic Matrix Composites in Generation IV Reactors

Description: This report provides an initial roadmap to obtain Nuclear Regulatory Commission (NRC) approval for using these material systems in a nuclear application. The possible paths taken to achieving NRC approval are necessarily subject to change as this is an on-going process that shifts as more data and a clearer understanding of the nuclear regulations are gathered.
Date: May 1, 2006
Creator: Jenkins, M. G.; Lara-Curzio, E. & Windes, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Developing an Innovative Field Expedient Fracture Toughness Testing Protocol for Concrete Materials

Description: The Spiral Notch Torsion Fracture Toughness Test (SNTT) was developed recently to determine the intrinsic fracture toughness (KIC) of structural materials. The SNTT system operates by applying pure torsion to uniform cylindrical specimens with a notch line that spirals around the specimen at a 45 pitch. KIC values are obtained with the aid of a three-dimensional finite-element computer code, TOR3D-KIC. The SNTT method is uniquely suitable for testing a wide variety of materials used ext… more
Date: September 1, 2008
Creator: Wang, Jy-An John; Liu, Ken C & Naus, Dan J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aliens and atheists: The Plurality of Worlds and Natural Theology in Seventeenth-Century England.

Description: The plurality of worlds has had a long history in England, which has not gone unnoticed by scholars. Historians have tended to view this English pluralist tradition as similar to those found on the continent, and in doing so have failed to fully understand the religious significance that the plurality of worlds had on English thought and society. This religious significance is discovered through a thorough investigation of plurality as presented by English natural philosophers and theologians, … more
Date: December 2007
Creator: Oliver, Ryan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Micro and nano composites composed of a polymer matrix and a metal disperse phase.

Description: Low density polyethylene (LDPE) and Hytrel (a thermoplastic elastomer) were used as polymeric matrices in polymer + metal composites. The concentration of micrometric (Al, Ag and Ni) as well as nanometric particles (Al and Ag) was varied from 0 to 10 %. Composites were prepared by blending followed by injection molding. The resulting samples were analyzed by scanning electron microscopy (SEM) and focused ion beam (FIB) in order to determine their microstructure. Certain mechanical properties of… more
Date: December 2007
Creator: Olea Mejia, Oscar Fernando
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Status of geometry effects on structural nuclear composite properties

Description: structural ceramic composites being considered for control rod applications within the VHTR design. While standard sized (i.e. 150-mm long or longer) test specimens can be used for baseline non-irradiated thermal creep studies, very small, compact, tensile specimens will be required for the irradiated creep studies. Traditionally, it is standard practice to use small, representative test samples in place of full-size components for an irradiated study. However, a real problem exists for scale-u… more
Date: September 1, 2005
Creator: Windes, Will; Katoh, Y.; Snead, L.L.; Lara-Curzio, E. & C. Henagar, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Failure analysis and surety design of composite patching systems.

Description: This work presents an experimental evaluation of patch repair of solid laminated composites. The study was focused on destructive and nondestructive tests of full-scale repaired panels under static tension loading conditions. The testing program consisted of ten panels: three pristine, three damaged, three repaired and one repaired with mismatched fiber orientation patch. The evaluated panels were (300 mm x 675 mm) in size and consisted of 6-ply ((-60 /60/0){sub s}) quasi-isotropic laminates. T… more
Date: August 1, 2004
Creator: Hamoush, Sameer (North Carolina A&T State University, Greensboro, NC)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Subcritical Crack Growth in Ceramic Composites at High Temperature Measured Using Digital Image Correlation

Description: An in situ experimental technique is described that allows high resolution, high sensitivity determination of displacements and full-field strains during high temperature mechanical testing. The technique is used to investigate elevated temperature crack growth in SiC/Nicalon sub f composites. At 1150 degrees C, the reinforcing fibers have a higher creep susceptibility than the matrix. Fiber creep leads to relaxation of crack bridging tractions, resulting in subcritical crack growth. Differenti… more
Date: January 11, 1996
Creator: Mumm, D. R.; Morris, W. L.; Dadkhah, M. S. & Cox, B. N.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
open access

Fiber-Matrix Interface Studies on Electron Beam Cured Composites

Description: The recently completed Department of Energy (DOE) and industry sponsored Cooperative Research and Development Agreement (CRADA) entitled, ''Electron Beam Curing of Polymer Matrix Composites,'' determined that the interlaminar shear strength properties of the best electron beam cured IM7/epoxy composites were 19-28% lower than autoclave cured IM7/epoxy composites (i.e. IM7/977-2 and IM7/977-3). Low interlaminar shear strength is widely acknowledged as the key barrier to the successful acceptance… more
Date: May 23, 1999
Creator: Drazel, L. T.; Janke, C. J. & Yarborough, K. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Microstructural evolution in elastically stressed systems. Final report

Description: The results, which have been compared to numerical simulations and found to be in very good agreement, predict that diviations in composition on the order of several atomic percent (measured with respect to equilibrium compositions) are possible at the interface. Interfacial compositions are strongly time dependent and are also influenced by the stress state.
Date: September 14, 1997
Creator: Johnson, W.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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