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71.
DSC Model for Soil and Interface Including Liquefaction and Prediction of Centrifuge Test 总被引:2,自引:0,他引:2
Realistic predictions of dynamic soil–structure interaction problems require appropriate constitutive models for the characterization of soils and interfaces. This paper presents a unified model based on the disturbed state concept (DSC). The parameters for the models for the Nevada sand, and sand–metal interface are obtained based on available triaxial test data on the sand and interfaces. The predicted stress–strain–pore water pressure behavior for the sand using the DSC model is compared with the test data. In addition, a finite element procedure with the DSC model, based on the generalized Biot’s theory, is used to predict the measured responses for a pile (aluminum) sand foundation problem obtained by using the centrifuge test. The predictions compared very well with measured pore water pressures. The DSC model is used to identify microstructural instability leading to liquefaction. A procedure is proposed to apply the proposed method for analysis and design for dynamic response and liquefaction. 相似文献
72.
73.
Shashank Pandey 《热应力杂志》2018,41(5):543-567
A finite element formulation for stress analysis of functionally graded material (FGM) sandwich plates and shell panels under thermal shock is presented in this work. A higher-order layerwise theory in conjunction with Sanders’ approximation for shells is used to develop the finite element formulation for transient stress analysis of FGM sandwich panels. The top and the bottom surfaces of FGM sandwich panels are made of pure ceramic and metal, respectively, and core of the sandwich is assumed to be made of FGM. The temperature profile in the thickness direction of the panels is considered to be varying as per the Fourier’s law of heat conduction equation for unsteady state. The heat conduction equations are solved using the central difference method in conjunction with the Crank–Nicolson approach. Transient thermal displacements of the sandwich panels are obtained using Newmark average acceleration method and the transient thermal stresses are obtained using stress–strain relations, subsequently. Results obtained from the present layerwise finite element formulations are first validated with available solutions in literature. Parametric studies are taken up to study the effects of volume fraction index, temperature dependency of material properties, core thickness, panel configuration, geometric and thermal boundary conditions on transient thermal stresses of FGM sandwich plates and shells. 相似文献
74.
Li Tan Shashank KothapalliLongxiang Chen Omar HussainiRyan Bissiri Zizhong Chen 《Parallel Computing》2014
Extreme scale supercomputers available before the end of this decade are expected to have 100 million to 1 billion computing cores. The power and energy efficiency issue has become one of the primary concerns of extreme scale high performance scientific computing. This paper surveys the research on saving power and energy for numerical linear algebra algorithms in high performance scientific computing on supercomputers around the world. We first stress the significance of numerical linear algebra algorithms in high performance scientific computing nowadays, followed by a background introduction on widely used numerical linear algebra algorithms and software libraries and benchmarks. We summarize commonly deployed power management techniques for reducing power and energy consumption in high performance computing systems by presenting power and energy models and two fundamental types of power management techniques: static and dynamic. Further, we review the research on saving power and energy for high performance numerical linear algebra algorithms from four aspects: profiling, trading off performance, static saving, and dynamic saving, and summarize state-of-the-art techniques for achieving power and energy efficiency in each category individually. Finally, we discuss potential directions of future work and summarize the paper. 相似文献
75.
The composition of Pt-Rh alloys that co-exist with Rh2O3 in air have been identified by experiment at 1273 K. The isothermal sections of the phase diagram for the ternary system
Pt-Rh-O at 973 K and 1273 K have been computed based on experimentally determined phase relations and recent thermodynamic
measurements on Pt1−X
Rh
X
alloys and Rh2O3. The composition dependence of the oxygen partial pressure for the oxidation of Pt1−X
Rh
X
alloys at different temperatures, and temperature for the oxidation of the alloys in air are computed. The diagrams provide
quantitative information for optimization of the composition of Pt1−X
Rh
X
alloys for high temperature application in oxidizing atmospheres. 相似文献
76.
Atomic solvation parameters (ASPs) are widely used to estimatethe solvation contribution to the thermodynamic stability ofproteins as well as the free energy of association for proteinligandcomplexes. In view of discrepancies in the results of free energiesof solvation of folding for various proteins obtained usingdifferent atomic solvation parameter sets, systematic studieshave been carried out for the calculation of accessible surfacearea and the changes in free energy of solvation of folding( 相似文献
77.
This study investigates the variation of magnetoelectric (ME) coefficient as a function of the piezoelectric grain size in
the composite system of 0.8 Pb(Zr0.52Ti0.48)O3–0.2 Ni0.8Zn0.2Fe2O4. It was found that as the piezoelectric-phase grain size increases the overall resistivity, piezoelectric, dielectric, and
ferroelectric property of the composite increases and saturates above 600 nm. Below 200 nm average grain size, piezoelectric
and dielectric properties decrease rapidly. The ferroelectric Curie temperature was found to decrease from 377 to 356 °C as
the average grain size decreases from 830 to 111 nm. ME coefficient of the composite showed a rapid change below grain size
of 200 nm and was found to saturate above 600 nm to a value of 155 mV/cm.Oe. 相似文献
78.
Sujittra Chandarak Jaru Jutimoosik Athipong Bootchanont Muangjai Unruan Pongsakorn Jantaratana Shashank Priya Sutham Srilomsak Saroj Rujirawat Rattikorn Yimnirun 《Journal of Superconductivity and Novel Magnetism》2013,26(2):455-461
The novel Cu- and Mn-doped and Cu/Mn codoped 0.75BiFeO3–0.25BaTiO3 magnetoelectric ceramics were successfully prepared by a solid-state reaction method. The dielectric, ferroelectric, ferromagnetic, and magnetoelectric properties were determined and all the results suggested that Cu and Mn dopants occupied different B-site lattices in the 0.75BiFeO3–0.25BaTiO3 structure. To identify the preferential sites of Cu and Mn in the lattice, Synchrotron X-ray Absorption Spectroscopy (SXAS) measurements were carried out. A combination of both measured and simulated XAS results with a linear combination fitting (LCF) revealed that in Cu- and Mn-doped 0.75BiFeO3–0.25BaTiO3 ceramics both Mn and Cu substituted at Fe-site and Ti-site with slightly different proportion. On the other hand, both dopants were found to occupied different sites in Cu/Mn codoped 0.75BiFeO3–0.25BaTiO3 ceramics. 相似文献
79.
Meihua Shen Wilfred Pau Nicolas Gani Jianping Wen Shashank Deshmukh Thorsten Lill Jian Zhang Hanming Wu Guqing Xing 《半导体技术》2004,29(8)
This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration. 相似文献
80.
Sandeep Sahu Prabhat Chand Yadav Shashank Shekhar 《Metallurgical and Materials Transactions A》2018,49(2):628-643
In this investigation, Inconel 600 alloy was thermomechanically processed to different strains via hot rolling followed by a short-time annealing treatment to determine an appropriate thermomechanical process to achieve a high fraction of low-Σ CSL boundaries. Experimental results demonstrate that a certain level of deformation is necessary to obtain effective “grain boundary engineering”; i.e., the deformation must be sufficiently high to provide the required driving force for postdeformation static recrystallization, yet it should be low enough to retain a large fraction of original twin boundaries. Samples processed in such a fashion exhibited 77 pct length fraction of low-Σ CSL boundaries, a dominant fraction of which was from Σ3 (~ 64 pct), the latter with very low deviation from its theoretical misorientation. The application of hot rolling also resulted in a very low fraction of Σ1 (~ 1 pct) boundaries, as desired. The process also leads to so-called “triple junction engineering” with the generation of special triple junctions, which are very effective in disrupting the connectivity of the random grain boundary network. 相似文献