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Full-Text Articles in Engineering
Stochastic Lightning Damage Prediction Of Carbon/Epoxy Composites With Material Uncertainties, S.Z.H. Shah, Juhyeong Lee
Stochastic Lightning Damage Prediction Of Carbon/Epoxy Composites With Material Uncertainties, S.Z.H. Shah, Juhyeong Lee
Mechanical and Aerospace Engineering Faculty Publications
This study presents a novel stochastic modeling framework predicting lightning thermal damage in carbon/epoxy composites. The stochastic lightning damage model (SLDM) was developed with random distributions of composite’s electrical conductivity and void. The Box-Muller transformation was applied to generate random in-plane and through-thickness electrical conductivities with Gaussian distributions. The SLDM suggested that the predicted lightning thermal damage to carbon/epoxy composites increased slightly with the use of stochastic electrical conductivity, but the presence of voids did not significantly affect the damage development. The predicted size and shape of lightning thermal damage agreed fairly well with experimental results. In addition, the proposed …
Observations On Braided Thin Wire Nucleate Boiling In Microgravity, Justin P. Koeln, Jeffrey C. Boulware, Heng Ban, Jr Dennison
Observations On Braided Thin Wire Nucleate Boiling In Microgravity, Justin P. Koeln, Jeffrey C. Boulware, Heng Ban, Jr Dennison
Publications
A microgravity experiment was conducted on the Space Shuttle Endeavor (STS-108) to observe sustained nucleate boiling of water. Subcooled water was boiled with a single strand and a braid of three 0.16. mm diameter and 80. mm long Nichrome resistive wires. A CCD video camera recorded the experiment while six thermistors recorded the temperature of the fluid at various distances from the heating element. This paper reports experimental results in observations, measurements, and data analysis. Bubble explosions were found to take place shortly after the onset of boiling for both the single and braid of wires. The explosion may produce …
Stabilization Studies On Soil-Cement Mixtures For Experimental Lining--Logan Experimental Section--Logan, Utah, United States Department Of The Interior, Bureau Of Reclamation
Stabilization Studies On Soil-Cement Mixtures For Experimental Lining--Logan Experimental Section--Logan, Utah, United States Department Of The Interior, Bureau Of Reclamation
Elusive Documents
Earth Materials Laboratory Report No. EM-170 covers the laboratory tests made on one type of soil from Logan, Utah, for the purpose of using the soil in soil-cement canal lining experiments. The intention was that two types of soil would be used for experimental linings at Logan, Utah; a fine sandy soil, poorly graded with little or no silt (Classification Symbol SP) and a fine sandy soil with excess silt (Classification Symbol SF-silty). These field test sections which will provide durability and permeability information gathered under natural conditions were carried out as part of a joint lower-cost canal lining experiment …