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Bending and free vibration analysis for FGM plates containing various distribution shape of porosity
Hadji, Lazreg,Bernard, Fabrice,Safa, Abdelkader,Tounsi, Abdelouahed Techno-Press 2021 Advances in materials research Vol.10 No.2
In this paper hyperbolic shear deformation plate theory is presented for bending and the free vibration of functionally graded plates with considering porosities that may possibly occur inside the functionally graded materials (FGMs) during their fabrication. Four different porosity types are used for functionally graded plates. Equations of motion are derived from Hamilton's principle. In the solution of the governing equations, the Navier procedure is implemented. In the numerical examples, the effects of the porosity parameters, porosity types and geometry parameters on the bending and free vibration of the functionally graded plates are investigated. It was found that the distribution form of porosity significantly influence the mechanical behavior of FG plates, in terms of deflection, normal, shear stress and frequency.
Lazreg Hadji,Nafissa Zouatnia,Fabrice Bernard 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.2
In this paper, a new higher order shear deformation model is developed for static and free vibration analysis of functionally graded beams with considering porosities that may possibly occur inside the functionally graded materials (FGMs) during their fabrication. Different patterns of porosity distributions (including even and uneven distribution patterns, and the logarithmic-uneven pattern) are considered. In addition, the effect of different micromechanical models on the bending and free vibration response of these beams is studied. Various micromechanical models are used to evaluate the mechanical characteristics of the FG beams whose properties vary continuously across the thickness according to a simple power law. Based on the present higher-order shear deformation model, the equations of motion are derived from Hamilton’s principle. Navier type solution method was used to obtain displacement, stresses and frequencies, and the numerical results are compared with those available in the literature. A comprehensive parametric study is carried out to assess the effects of volume fraction index, porosity fraction index, micromechanical models, mode numbers, and geometry on the bending and natural frequencies of imperfect FG beams.
Hassen Ait Atmane,Abdelouahed Tounsi,Fabrice Bernard,S. R. Mahmoud 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.2
This work presents a free vibration analysis of functionally graded metal-ceramic (FG) beams with considering porosities that may possibly occur inside the functionally graded materials (FGMs) during their fabrication. For this purpose, a simple displacement field based on higher order shear deformation theory is implemented. The proposed theory is based on the assumption that the transverse displacements consist of bending and shear components in which the bending components do not contribute toward shear forces and, likewise, the shear components do not contribute toward bending moments. The most interesting feature of this theory is that it accounts for a quadratic variation of the transverse shear strains across the thickness, and satisfies the zero traction boundary conditions on the top and bottom surfaces of the beam without using shear correction factors. In addition, it has strong similarities with Euler-Bernoulli beam theory in some aspects such as equations of motion, boundary conditions, and stress resultant expressions. The rule of mixture is modified to describe and approximate material properties of the FG beams with porosity phases. By employing the Hamilton's principle, governing equations of motion for coupled axial-shear-flexural response are determined. The validity of the present theory is investigated by comparing some of the present results with those of the first-order and the other higher-order theories reported in the literature. Illustrative examples are given also to show the effects of varying gradients, porosity volume fraction, aspect ratios, and thickness to length ratios on the free vibration of the FG beams.
La transmission en situation interculturelle, porteuse de sens, de performance et de mobilité
Fabrice Duru 고려대학교 응용문화연구소 2014 에피스테메 Vol.0 No.12
Cultural transmission, more than a cultural material brought in culturalheritage to a community which recognizes itself through what it conveyssuch as a deep sense of a identity structuring, can be lived as anexchange of mutual enrichment within a space where interact people andvalues, the cross-cultural space. In this situation where the individualstrying to exchange and to bloom mutually must go beyond the constraintsof personal blockings or attitudes of foreign rejection, the internationalstudents represent a situation prone population to this generous anddynamic interface. Among this population, the original management sciencestudents in sub-Saharan Africa and China appear to be particularlysensitive to the issue of intercultural transmission and its implementationin everyday life. The relationship to the nature and the place of theinvisible world in explanation of any human action provides its involvementin cross-cultural situations. Dynamics allows players to set up a gamewithin which the culture develops correlation links with the changingenvironment and sustainable cultural structure capacities. In this unstablereality, the cultural openness becomes the condition for effective cross-cultural transmission and successful professional integration. Brakesare overtaken with the emergence of distinctive intercultural skills. Lifeskills related to your real-life experience, which draw from the family,social experience and the cultural referents act as so many factors ofperformance, employability and renewed mobility.
A Study on Korea’s Old Age and Satisfaction of Life in 2016
Fabrice Nganda Enga 부경대학교 글로벌지역학연구소 2022 Journal of Global and Area Studies(JGA) Vol.6 No.1
This essay explores robust indicators to empirically investigate how economic, social, demographic, and health-related determinants have affected the overall life satisfaction of 4,886 elderly Korean individuals during the pre-COVID-19 era, particularly in 2016. Using the 2016 Ko.We.PS merged datasets, the analysis of Pooled OLS regression, and cross-sectional ordered logit reveals, as for the year 2016, only certain items within each indicator group have more significance for life satisfaction than the overall economic, sociodemographic, and health-related indicators. Some items, among which, disposable income (1.41; t= 0.23; p=0.82; 95% CI, −1.1 to 1.4); land (p=0.004; t=2.86; R2=0.65; 95% CI of 2.3 to 1.2); and disability (.0026; t=0.87; p=0.38; 95% CI, −0.003 to 0.008) are positively associated with life satisfaction. This is while the location item (−.0014; t=−0.26; p=0.79; R2=0.65; 95% CI of −0.01 to 0.01), among others, negatively affects the overall life satisfaction of Korea’s elderly.
Photoactive Organic/Inorganic Hybrid Materials with Nanosegregated Donor–Acceptor Arrays
Fabrice Mathevet,Xiaolei Zhu,Cheriehan Hessin,Aude Salam,Lydia Sosa-Vargas,David Kreher,Chihaya Adachi,Anna Proust,Pierre Mialane,Jerome Marrot,Aude Bouchet,Michel Sliwa,Stephane Mery,Benoit Heinrich 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We designed and synthesized a first example of mesogenic donor-acceptor polyoxometalate (POM)-based hybrid. The structural and electronic properties of the hybrid compound were evaluated through combination of small- and wide-angle X-ray scattering, optical microscopy, electrochemistry and photoluminescence. In the solid state, the compound behaves as a birefringent solid, displaying a lamellar organization in which double-layers of POMs and bis(thiophene)thienothiophene organic donors alternate regularly. Noticeably, the subunit organizations in the composite are similar to that observed for the individual POM and organic donor precursors. Photophysical studies showed that in the hybrid, the fluorescence of the organic donor unit is considerably quenched both in solution and in the solid state, which is attributed to occurrence of intramolecular charge-separated state.