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A micromechanical basis for partitioning the evolution of grainbridging in brittle materials

Description: A micromechanical model is developed for grain bridging inmonolithic ceramics. Specifically, bridge formation of a single,non-equiaxed grain spanning adjacent grains is addressed. A cohesive zoneframework enables crack initiation and propagation along grainboundaries. The evolution of the bridge is investigated through avariance in both grain angle and aspect ratio. We propose that thebridging process can be partitioned into five distinct regimes ofresistance: propagate, kink, arrest, stall, an… more
Date: October 9, 2006
Creator: Foulk, J. W., III; Cannon, R. M.; Johnson, G. C.; Klein, P. A. & Ritchie, R. O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance Criteria for Residential Zero Energy Windows

Description: This paper shows that the energy requirements for today's typical efficient window products (i.e. ENERGY STAR{trademark} products) are significant when compared to the needs of Zero Energy Homes (ZEHs). Through the use of whole house energy modeling, typical efficient products are evaluated in five US climates and compared against the requirements for ZEHs. Products which meet these needs are defined as a function of climate. In heating dominated climates, windows with U-factors of 0.10 Btu/hr-… more
Date: October 9, 2006
Creator: Arasteh, Dariush; Goudey, Howdy; Huang, Joe; Kohler, Christian & Mitchell, Robin
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Substrate Creep on The Fatigue Life of A Model Dental Multilayer Structure

Description: In this paper, we investigated the effects of substrate creep on the fatigue behavior of a model dental multilayer structure, in which a top glass layer was bonded to a polycarbonate substrate through a dental adhesive. The top glass layers were ground using 120 grit or 600 grit sand papers before bonding to create different sub-surface crack sizes and morphologies. The multilayer structures were tested under cyclic Hertzian contact loading to study crack growth and obtain fatigue life curves. … more
Date: October 9, 2006
Creator: Zhou, J; Huang, M; Niu, X & soboyejo, W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Particle and Energy Transport in the SOL of DIII-D and NSTX

Description: The far scrape-off layer (SOL) radial transport and plasma-wall contact is mediated by intermittent and ELM-driven transport. Experiments to characterize the intermittent transport and ELMs have been performed in both DIII-D and NSTX under similar conditions. Both intermittent transport and ELMs are comprised of filaments of hot, dense plasma (n{sub e} {approx} 1 x 10{sup 13} cm{sup -3}, T{sub e} {approx} 400 eV) originating at the edge, transport both particles and heat into the SOL by convect… more
Date: October 9, 2006
Creator: Boedo, J.; Maqueda, R.; Rudakov, D.; McKee, G.; Kugel, H.; Maingi, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

AN OVERVIEW OF CESIUM-137 CONTAMINATION IN A SOUTHEASTERN SWAMP ENVIRONMENT

Description: In the early 1960s, an area of privately owned swamp adjacent to the Savannah River Site (SRS) was contaminated by site operations. Studies conducted in 1974 estimated that approximately 925 GBq of {sup 137}Cs and 37 GBq of {sup 60}Co were deposited in the swamp. Subsequently, a series of surveys was initiated to characterize the contaminated environment. These surveys--composed of 52 monitoring locations--allow for continued monitoring at a consistent set of locations. Initial survey results i… more
Date: October 9, 2006
Creator: Fledderman, P; Tim Jannik, T & Michael Paller, M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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