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in subjects: "Young Modulus"  
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Effect of pore pressure on the elastic moduli, porosity and permeability of Berea sandstone and Leuders limestone

Description: The behavior of Berea sandstone and Leuders limestone under atmospheric and elevated pore pressures is reported. The porosity and the permeability changes, along with the static and dynamic moduli for these rocks have been determined under various conditions. The existing theoretical background pertinent to the study is reviewed along with the previous experimental work. The detailed descriptions and the discussions on the experimental procedure involved and the equipment utilized are presented… more
Date: February 1, 1983
Creator: Thompson, T.W.; Kelkar, S.M. & Gray, K.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Physical and mechanical properties of cast 17-4 PH stainless steel

Description: The physical and mechanical properties of an overaged 17-4 PH stainless steel casting have been examined. The tensile and compressive properties of cast 17-4 PH are only influenced to a slight degree by changing test temperature and strain rate. However, both the Charpy impact energy and dynamic fracture toughness exhibit a tough-to-brittle transition with decreasing temperature - this transition being related to a change in fracture mode from ductile, dimple to cleavage-like. Finally, although… more
Date: February 1, 1981
Creator: Rack, H. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Compression wave studies in Blair dolomite

Description: Dynamic compression wave studies have been conducted on Blair dolomite in the stress range of 0-7.0 GPa. Impact techniques were used to generate stress impulse input functions, and diffuse surface laser interferometry provided the dynamic instrumentation. Experimental particle velocity profiles obtained by this method were coupled with the conservation laws of mass and momentum to determine the stress-strain and stress-modulus constitutive properties of the material. Comparison between dynamic … more
Date: February 1, 1976
Creator: Grady, D. E.; Hollenbach, R. E.; Schuler, K. W. & Callender, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bond Strength of Cementitious Borehole Plugs in Welded Tuff

Description: Axial loads on plugs or seals in an underground repository due to gas, water pressures and temperature changes induced subsequent to waste and plug emplacement lead to shear stresses at the plug/rock contact. Therefore, the bond between the plug and rock is a critical element for the design and effectiveness of plugs in boreholes, shafts or tunnels. This study includes a systematic investigation of the bond strength of cementitious borehole plugs in welded tuff. Analytical and numerical analysi… more
Date: February 1, 1991
Creator: Akgun, H. & Daemen, J. J. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical properties and deformation of polycrystalline lithium orthosilicate

Description: Room-temperature strength, fracture toughness, Young's modulus, and thermal-shock resistance were determined for 68--98% dense lithium orthosilicate (Li/sub 4/SiO/sub 4/) specimens. In the low-density regime, both strength and fracture toughness were controlled by the density of the specimen. At high density, the strength depends on grain size. Young's modulus values ranged from 30--103 GPa at densities between 68 and 98% TD. A critical quenching temperature difference in the range of 150--170/… more
Date: February 1, 1988
Creator: Bar, K.; Chu, C.Y.; Singh, J.P.; Goretta, K.C.; Routbort, J.L.; Billone, M.C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stress transfer from axially loaded fiber to matrix in a microcomposite

Description: The shear lag model has been used extensively to analyze the stress transfer in a singe fiber-reinforced composite (i.e., a microcomposite). To achieve analytical solutions, various simplifications have been adopted in the stress analysis. Questions regarding the adequacy of those simplifications are discussed in the present study for the following two cases: bonded interfaces and frictional interfaces. Specifically, simplifications regarding (1) the radial dependences of axial stresses in the … more
Date: February 1, 1995
Creator: Hsueh, Chun-Hway
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of elevated temperature and pore pressure on the mechanical behavior of Bullfrog tuff

Description: Samples of the Bullfrog Member of the Crater Flat Tuff from the depth interval 758.9 to 759.2 m in hole USW-G1 on the Nevada Test Site were tested in triaxial compression. Test conditions were: (1) effective confining pressure to 20 MPa; (2) temperature of 200{sup 0}C; (3) both dry and with pore water pressures from 3.4 to 5 MPa; and (4) a strain-rate of 10{sup -4}/s. The results suggest that the presence of water causes the strength to decrease. In addition, the brittle-ductile transition pres… more
Date: February 1, 1982
Creator: Olsson, W. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Residual stress, strain, and faults in nanocrystalline palladium and copper

Description: Nanocrystalline Pd and Cu, prepared by inert gas condensation and warm compaction, were studied using x-ray diffraction techniques. A sample of Cu with sub-micrometer grain size produced by severe plastic deformation was also examined. The Warren-Averbach technique was used to separate the line broadening due to grain size, root-mean-squared strain, and faults. Peak shifts and asymmetry were used to determine the long range surface stresses, stacking fault probability, and twin probability. The… more
Date: February 1, 1995
Creator: Sanders, P. G.; Witney, A. B.; Weertman, J. R.; Valiev, R. Z. & Siegel, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A modified direct method for the calculation of elastic moduli of composite materials

Description: The modified direct method is a scheme for the estimation of elastic moduli of composite materials and is based on micromechanical theory and classical elasticity. Using the statistical homogeneous assumption and the two-phase composite approach, one takes the average field of the composite. Due to the complexity of composite materials, the modeling parameters for the exact analytical theory are not always available and then the effective bounds are usually too wide for practical application. F… more
Date: February 1, 1996
Creator: Wang, J. A.; Lubliner, J. & Monteiro, P. J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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