The Experts below are selected from a list of 5712 Experts worldwide ranked by ideXlab platform
K Komvopoulos - One of the best experts on this subject based on the ideXlab platform.
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a molecular dynamics analysis of the effect of surface passivation on the adhesion Deformation behavior and structure stability of amorphous carbon ultrathin films
Materials Letters, 2021Co-Authors: Shengxi Wang, K KomvopoulosAbstract:Abstract Basic knowledge of the interfacial interactions, contact Deformation, and structure changes in amorphous carbon (a-C) ultrathin films due to Irreversible Deformation is of critical importance to the protective effectiveness of these films. This paper presents a molecular dynamics (MD) analysis that reveals the role of surface passivation on the contact Deformation and adhesion characteristics of ultrathin (
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pseudoelasticity of shape memory titanium nickel films subjected to dynamic nanoindentation
Applied Physics Letters, 2004Co-Authors: X G, K KomvopoulosAbstract:Surface force microscopy was used to examine the dynamic indentation response of austenitic titanium–nickel (TiNi) films sputtered on oxidized silicon substrates. Results demonstrate the significance of indentation cycles, time at maximum contact load, and loading/unloading rate on the nanoscale pseudoelastic behavior of the TiNi films. The dynamic behavior of the films is interpreted in terms of the mechanisms responsible for the energy dissipated in the absence of Irreversible Deformation. The significant amount of mechanical work dissipated without permanent Deformation illustrates the potential of TiNi films as structural materials for dynamic microdevice applications.
Vanessa Fierro - One of the best experts on this subject based on the ideXlab platform.
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Irreversible Deformation of hyper crosslinked polymers after hydrogen adsorption
Journal of Colloid and Interface Science, 2022Co-Authors: Pamela Ramirezvidal, F Suarezgarcia, Rafael Luan Sehn Canevesi, Alberto Castromuniz, Philippe Gadonneix, J I Paredes, Alain Celzard, Vanessa FierroAbstract:Hyper-crosslinked polymers (HCPs) have been produced by the Friedel-Crafts reaction using anthracene, benzene, carbazole or dibenzothiophene as precursors and dimethoxymethane as crosslinker, and the effect of graphene oxide (GO) addition has been studied. The resulting HCPs were highly microporous with BET areas (A BET) between 590 and 1120 m 2 g A1. The benzene-derived HCP (B1FeM2) and the corresponding composite with GO (B1FM2-GO) exhibited the highest A BET and were selected to study their hydrogen adsorption capacities in the pressure range of 0.1-14 MPa at 77 K. The maximum H 2 excess uptake was 2.1 and 2.0 wt% for B1FeM2 and B1FeM2-GO, respectively, at 4 MPa and 77 K. The addition of GO reduced the specific surface area but increased the density of the resultant HCP-GO composites, which is beneficial for practical applications and proves that materials giving higher gravimetric storage capacities are not necessarily those that offer higher volumetric capacities. H 2 adsorption-desorption cycles up to 14 MPa showed Irreversible Deformation of both HCP and HCP-GO materials, which calls into question their application for hydrogen adsorption at pressures above 4 MPa.
F D Fischer - One of the best experts on this subject based on the ideXlab platform.
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The Irreversible Deformation of a duplex stainless steel under thermal cycling
Materials Science and Engineering A, 1993Co-Authors: Thomas Siegmund, E Werner, F D FischerAbstract:In duplex stainless steels the constituent phases austenite and ferrite have different coefficients of thermal expansion. On varying the temperature a remarkable stress state develops which changes in sign from phase to phase. On pure thermal cycling the yield strength of the phases can be exceeded. Specimens of a forged duplex steel with uniaxial anisotropic microstructure were investigated in dilatometer experiments. Under repeated thermal cycles specimens deformed irreversibly with a monotonic accumulation of strains. In longitudinal specimens an increase in length was observed. Transverse specimens, however, decrease in length. A micromechanical model applying the finite element method is used to calculate the thermal properties of the duplex steel from the properties of its constituent phases. A mechanism driving the ratchet effect is proposed. The temperature dependent yield strength of the phases is responsible for the Irreversible Deformations. The model points out the importance of correct representation of the spatial distribution of the constituent phases in the micromechanical model. A systematic quantitative investigation of the effects of microstructure on the overall material behavior is based on a description of real and model microstructures by the same stereological parameters. Results from model calculations are in good agreement with results from experiments. © 1993.
K Rusinko - One of the best experts on this subject based on the ideXlab platform.
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synthetic theory of Irreversible Deformation in the context of fundamental bases of plasticity
Mechanics of Materials, 2009Co-Authors: A Rusinko, K RusinkoAbstract:Abstract A new theory, the synthetic theory of Irreversible Deformation, is presented. This theory is based on the Sanders variant of flow plasticity theory and the Batdorf–Budiansky slip concept and concerns with small plastic strains of work-hardening materials. The synthetic theory is considered in the context of the main requirements imposed on theories of plasticity. Therefore, first, the disagreements of classical theories (flow plasticity theories and the slip concept) with these requirements are indicated and then it is shown how the synthetic theory removes these shortcomings. One of the most important features of the proposed theory is the arising of corner point on a loading surface during loading. This fact considerably widens the applicability of the synthetic theory, especially for the cases of non-smooth (angular) loading trajectories.
Ben P Kirtman - One of the best experts on this subject based on the ideXlab platform.
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north atlantic summertime anticyclonic rossby wave breaking climatology impacts and connections to the pacific decadal oscillation
Journal of Climate, 2019Co-Authors: Breanna L Zavadoff, Ben P KirtmanAbstract:AbstractAnticyclonic Rossby wave breaking (RWB) is characterized by the rapid and Irreversible Deformation of potential vorticity (PV) contours on isentropic surfaces manifesting as a pair of merid...
