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Serrated Behaviors and Plasticity of Nb-Alloyed Cu-Based Bulk Metallic Glasses
Jili Wu,Ziyi Zhou,Zhen Peng 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
This paper is to disclose the plastic deformation mechanism of 3 Nb-alloyed bulk metallic glasses and composites via theanalysis of serration dynamics. The as-cast alloys with 1.0 at% and 2.0 at% of Nb element display the large time windowof serrated events, implying that the serrated behavior can dynamically retain in a long-time scale and thus the alloys areendowed the largest compressive plasticity. The statistic results suggest that the serrated flow of both alloys with 1.0 at% and2.0 at% Nb element achieves the self-organized critical state. The normal probability plots were utilized to further evaluateserrated dynamics and demonstrate that large deviations from the mean value of stress drops facilitate the self-organizedcritical state of serrations. This work suggests that large plastic bulk metallic glasses and composites are characterized bynon-normal probability of serration statistics during plastic deformation.
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Yu Jili,Wu Jinjie,Liao Zhenyu,Zhou Zhenjie 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.10
A key comparison has been made between the air-kerma standards of the National Institute of Metrology (NIM), China, and other Asia Pacific Metrology Programme (APMP) members in the medium-energy X-ray. This paper reviews the primary standard Free-air ionization chamber correc- tion factor experimental method and Monte Carlo simulation method in the NIM. The experimental method and the Monte Carlo simulation method are adopted to obtain the correction factor for the medium-energy X-ray primary standard free-air ionization chamber at 100 kV, 135 kV, 180 kV, 250 kV four CCRI reference qualities. The correction factor has already been submitted to the APMP as key comparison data and the results are in good agreement with those obtained in pre- vious studies. This study shows that the experimental method and the EGSnrc simulation method are usually used in the measurement of the correction factor. In particular, the application of the simulation methods is more common.
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Resonance analysis of cantilever porous graphene platelet reinforced pipe under external load
Qinghua Huang,Xinping Yu,Jun Lv,Jilie Zhou,Marischa Ray Elvenia 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.3
Nowadays, there is a high demand for great structural implementation and multifunctionality with excellent mechanical properties. The porous structures reinforced by graphene platelets (GPLs) having valuable properties, such as heat resistance, lightweight, and excellent energy absorption, have been considerably used in different engineering implementations. However, stiffness of porous structures reduces significantly, due to the internal cavities, by adding GPLs into porous medium, effective mechanical properties of the porous structure considerably enhance. This paper is relating to vibration analysis of fluidconveying cantilever porous graphene platelet reinforced (GPLR) pipe with fractional viscoelastic model resting on foundations. A dynamical model of cantilever porous GPLR pipes conveying fluid and resting on a foundation is proposed, and the vibration, natural frequencies and primary resonant of such a system are explored. The pipe body is considered to be composed of GPLR viscoelastic polymeric pipe with porosity in which Halpin-Tsai scheme in conjunction with the fractional viscoelastic model is used to govern the construction relation of nanocomposite pipe. Three different porosity distributions through the pipe thickness are introduced. The harmonic concentrated force is also applied to the pipe and the excitation frequency is close to the first natural frequency. The governing equation for transverse motions of the pipe is derived by the Hamilton principle and then discretized by the Galerkin procedure. In order to obtain the frequency-response equation, the differential equation is solved with the assumption of small displacement, damping coefficient, and excitation amplitude by the multiple scale method. A parametric sensitivity analysis is carried out to reveal the influence of different parameters, such as nanocomposite pipe properties, fluid velocity and nonlinear viscoelastic foundation coefficients, on the primary resonance and linear natural frequency. Results indicate that the GPLs weight fraction porosity coefficient, fractional derivative order and the retardation time have substantial influences on the dynamic response of the system.
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