365 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Cracking"  
Results: 1 - 24 next
open access

Factors influencing horizontal cracking in continuously reinforced concrete pavements (CRCP).

Description: This research presents the results on an experimental investigation to identify the significant factors influencing horizontal cracking in continuously reinforced concrete pavements (CRCP). An in-depth analysis of the microstructure, morphological characteristics of the interfacial transition zone (ITZ) and the observation of cracking using the environmental scanning electron microscope (ESEM) was done. Characterization of oxides using Fourier transform infrared spectroscopy (FTIR) and electron… more
Date: August 2008
Creator: Sudoi, Elias K.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Experimental investigation of rim cracking in disks subjected to high temperature gradients

Description: Report presenting the results of an experimental investigation of rim cracking in a welded-blade composite gas-turbine wheel, in two carbon-steel disks, and five tool-steel disks. Various characteristics were investigated, including the effectiveness of holes in preventing crack propagation and the influence of hardness and various types of notch on rim cracking.
Date: September 1, 1949
Creator: Wilterdink, P. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of Rim Cracking in Turbine Wheels with Welded Blades

Description: Rim cracking in turbine wheels with welded blades was evaluated. The problem is explained on the basis of the occurrence of plastic flow in the rim during transient starting conditions when thermal compressive stresses resulting from high-temperature gradients exceed the proportional elastic limit of the material.
Date: February 12, 1947
Creator: Millenson, M. B. & Manson, S. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Biomass Gas Cleanup Using a Therminator

Description: The objective of the project is to develop and demonstrate a novel fluidized-bed process module called a “Therminator” to simultaneously destroy and/or remove tar, NH3 and H2S from raw syngas produced by a fluidized-bed biomass gasifier. The raw syngas contains as much as 10 g/m3 of tar, 4,000 ppmv of NH3 and 100 ppmv of H2S. The goal of the Therminator module would be to use promising regenerable catalysts developed for removing tar, ammonia, and H2S down to low levels (a… more
Date: March 6, 2012
Creator: Dayton, David C.; Kataria, Atish & Gupta, Rabhubir
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Resistance of six cast high-temperature alloys to cracking caused by thermal shock

Description: Report presenting an investigation to determine the relative resistance of six cast high-temperature alloys to cracking caused by thermal shock. The alloys tested included S-816, S-590, Vitallium, 422-19, X-40, and Stellite 6. Results regarding the tabulation of cycles to failure, crack properties, metallographic examination, and some curves of deformation data are provided.
Date: February 1950
Creator: Whitman, M. J.; Hall, R. W. & Yaker, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Susceptibility to Welding Cracking, Welding Sensitivity, Susceptibility to Welding Seam Cracking, and Test Methods for These Failures

Description: "In the years after the First World war a very rapid development, which even today has by no means come to an end, took place in the field of welding; here also, as in most technical innovations, failures made their appearance. Thereupon comprehensive Investigations were undertaken by steel manufacturers and consumers with cooperation of the authorities. In most cases the reasons for failure could be determined and eliminated and further occurrences avoided by the use of new test methods" (p. 1… more
Date: June 1949
Creator: Zeyen, K. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Static strength of cross-grain 7075-T6 aluminum-alloy extruded bar containing fatigue cracks

Description: Report presenting cross-grain specimens made of 7075-T6 aluminum-alloy extrusion were subjected to repeated axial loads until fatigue cracks of various lengths were formed. The specimens were subjected to static tests to determine the residual static strength.
Date: April 1957
Creator: Illg, Walter & McEvily, Arthur J., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A general kinetic-flow coupling model for FCC riser flow simulation.

Description: A computational fluid dynamic (CFD) code has been developed for fluid catalytic cracking (FCC) riser flow simulation. Depending on the application of interest, a specific kinetic model is needed for the FCC flow simulation. This paper describes a method to determine a kinetic model based on limited pilot-scale test data. The kinetic model can then be used with the CFD code as a tool to investigate optimum operating condition ranges for a specific FCC unit.
Date: May 18, 1998
Creator: Chang, S. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Origin and Development of Leading-Edge Cracks in Turbojet Engine Buckets

Description: Report presenting an investigation to study the origin and development of leading-edge cracking in turbine buckets made of six materials: S-816, M-252, Inconel 550, Inconel 700, Hastelloy R-235, and Jetalloy 1570. Some of the buckets were also given certain stress-relief treatments. Results regarding the development of leading-edge cracks, development of bucket fractures, comparison of performance for the material tested, macro- and microexamination of unfractured and fractured buckets,
Date: May 20, 1957
Creator: Springsteen, D. F.; Gyorgak, C. A. & Johnston, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some Observations on Stress-Corrosion Cracking of Single Crystals of AZ61X Magnesium Alloy

Description: Note presenting exploratory tests of the stress-corrosion cracking of single crystals of solution-treated AZ61X magnesium alloy in distilled water, in hydrofluoric acid, and in a salt-chromate solution. The results of this paper show that failures often start and run on planes other than the basal plane and are inconsistent with previously generated hypotheses. Results regarding the pilot tests on polycrystalline specimens and single-crystal tests are provided.
Date: July 1957
Creator: Meller, F. & Metzger, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Partial control of complex processing systems

Description: The past year saw substantial advances in the development of a model of Fluidized Catalytic Crackers, which now allows one to calculate both steady state and dynamic behavior of the system as basis for control studies. The first goal was to elucidate nonlinear features using the model. The model shows that adding a combustion promoter that catalyzes the CO-CO[sub 2] reaction reduces chances for multiple steady states within the range of desirable operating conditions; by adding enough promoter,… more
Date: January 1, 1993
Creator: Shinnar, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Influence of Exposed Area on Stress-Corrosion Cracking of 24S Aluminum Alloy

Description: Note presenting results of a study of the area effect in 24S aluminum alloy. The area effect refers to the phenomenon whereby small areas show long times to failure while large areas show short times. The effects of stress level, degree of sensitivity of the alloy, and hydrogen peroxide concentration in the corrosion medium were studied.
Date: November 1954
Creator: Colner, William H. & Francis, Howard T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of asymmetric with symmetric feed oil injection parameters in a riser reactor.

Description: A computational fluid dynamic (CFD) computer code was used to determine the effects of product yields of three feed injection parameters in a fluidized catalytic cracking (FCC) riser reactor. This study includes the effects of both symmetrical and non-symmetrical injection parameters. All these parameters have significant effects on the feed oil spray distribution, vaporization rates and the resulting product yields. This study also indicates that optimum parameter ranges exist for the investig… more
Date: April 20, 1999
Creator: Bowman, B. J.; Chang, S. L.; Lottes, S. A. & Zhou, C. Q.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Petroleum Refineries, Including Cracking Plants in the United States, January 1, 1948

Description: Report issued by the U.S. Bureau of Mines discussing the petroleum refineries and cracking plants throughout the United States. As stated in the introduction, "in this publication the capacities of petroleum refineries and cracking plants in the United States on January 1, 1948, are listed, according to the latest annual survey of the Bureau of Mines" (p. 1). This report includes tables, and a map.
Date: August 1948
Creator: Lott, F. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stress-corrosion fatigue-crack growth in a Zr-based bulk amorphousmetal

Description: Electrochemical and mechanical experiments were conducted to analyze the environmentally-influenced cracking behavior of a bulk amorphous metal, Zr41.2Ti13.8Cu12.5Ni10Be22.5. This study was motivated by a scientific interest in mechanisms of fatigue-crack propagation in an amorphous metal, and by a practical interest in the use of this amorphous metal in applications that take advantage of its unique properties, including high specific strength, large elastic strains and low damping. The object… more
Date: September 21, 2005
Creator: Schroeder, V. & Ritchie, R. O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mechanism of Irradiation Assisted Cracking of Core Components in Light Water Reactors

Description: The overall goal of the project is to determine the mechanism of irradiation assisted stress corrosion cracking (IASCC). IASCC has been linked to hardening, microstructural and microchemical changes during irradiation. Unfortunately, all of these changes occur simultaneously and at similar rates during irradiation, making attribution of IASCC to any one of these features nearly impossible to determine. The strategy set forth in this project is to develop means to separate microstructural from m… more
Date: April 28, 2003
Creator: Was, Gary S.; Atzmon, Michael & Wang, Lumin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Corrosion in Hydrogen Sulfide - Water Systems

Description: From abstract: "This report gives a detailed account of the corrosion test work carried out by the Engineering Research Laboratory on the behavior of materials of construction in the hydrogen sulfide-water system. Results developed during the period from October 1950 through November 1954 are included."
Date: October 1955
Creator: Snyder, J. A. & Warren, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen