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RISS 인기검색어
- 검색키워드
- 저자 : Madhusmita Sahu (검색결과 2 건)
- 무료
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Processing and Electrical Characteristics of Barium Doped CaCu3Ti4O12
Madhusmita Sahu,R. N. P. Choudhary 한국전기전자재료학회 2019 Transactions on Electrical and Electronic Material Vol.20 No.1
In this communication, the effect of a small amount of barium (15%) substitution on structural micro-structural, electrical (dielectric, impedance and conductivity) properties of CaCu3Ti4O12(i.e., Ca0.85Ba0.15Cu3Ti4O12 = CBCTO15) in different experimental conditions is presented. The polycrystalline sample of the material has been prepared by a cost-effective solidstate reaction technique. Rietveld refinement of XRD data has confirmed that the CBCTO15 sample crystallizes in cubic system bearing space group Im3. The surface micrograph depicts the dense packing of grains. The comprehensive studies of dielectric parameters [relative dielectric constant (εr), and loss tangent (tanδ)] are characterized over a wide range of temperature and frequency. The complex impedance and electrical modulus spectroscopy techniques have been employed which postulates the association of various effects (grain, grain boundary, electrode) and shed light on the conduction as well as the relaxation mechanism in the material.
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Hygrothermal effects on buckling of composite shell-experimental and FEM results
Shishir Kr. Sahu,Madhusmita Biswal,A.V. Asha,Namita Nanda 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.6
The effects of moisture and temperature on buckling of laminated composite cylindrical shell panels are investigated both numerically and experimentally. A quadratic isoparametric eight-noded shell element is used in the present analysis. First order shear deformation theory is used in the present finite element formulation for buckling analysis of shell panels subjected to hygrothermal loading. A program is developed using MATLAB for parametric study on the buckling of shell panels under hygrothermal field. Benchmark results on the critical loads of hygrothermally treated woven fiber glass/epoxy laminated composite cylindrical shell panels are obtained experimentally by using universal testing machine INSTRON 8862. The effects of curvature, lamination sequences, number of layers and aspect ratios on buckling of laminated composite cylindrical curved panels subjected to hygrothermal loading are considered. The results are presented showing the reduction in buckling load of laminated composite shells with the increase in temperature and moisture concentrations.
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