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- 저자 : M. Hadavi (검색결과 3 건)
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N. Nayebpashaee,S. H. Seyedein,M. R. Aboutalebi,H. Sarpoolaky,M. M. Hadavi 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8
Thermal barrier coating using turbine industries, application of pre- process simulation and on-line subsequent control basedon physical knowledge are greatly advantageous in order to develop the material performance despite of the time and costefficiency. Fuzzy linguistic- based model is one of the most accepted and promising approaches that is currently used in thecontrol systems of various engineering fields and applications. As for need of industrial units, physical simulation strategiesare too compound for industrial use and less efficient than soft computational techniques. A combination of fuzzy linguisticbasedmodel and finite element method (FEM) has therefore been developed in the terminology of a combined or “hybridmodel” in this study. The hybrid model was applied to predict residual stress during thermomechanical process in functionallygraded thermal barrier coating (FG-TBC). Results show that, interface shape amplitude and ceramic constituent in compositelayer have significant effect in distribution of residual stress in interface regions and can be considered as potent zones for bothvertical and horizontal cracks. In addition, this study shows excellent potential of such finite element-artificial intelligencehybrid approach for analysis of high temperature imposing of these protective coatings.
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Characteristics of Nanostructured Powder Mixture Produced by Ball Milling
Azimi Hossein,Ahmadi Eltefat,Hadavi S.M.Mehdi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In the present work, the influence of the ball-milling time, milling atmosphere and weight ratio of ball to powder on characteristics of was studied. Results show that, the grain sizes of the and CuO in the ball-milled powder mixture were significantly decreased with increasing the milling time. Those of each oxide ball-milled in Argon and Hexane atmosphere for 30 and 20 hour were about 98 and 84 nm, respectively. After milling of 20 hour in Hexane as PCA, the powder had a homogeneously mixed structure and the average size of powders was determined to about 230nm.
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S. Nouri,S. Sahmani,M. Hadavi,Sh. Mirdamadi 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
Due to having low density as well as high specific modulus and fatigue toughness, Al–Li alloys have been targeted as anadvanced material for using in aerospace applications. In the current investigation, a new heat treatment method namelyas directional quenching process is proposed to improve the mechanical properties of the Al–Li 8090 alloy, the results ofwhich are compared with those of T6 and T8 aging heat treatment techniques. For this purpose, aging process at 170 °C isconducted in all of the three heat treatment methods, but the solutionizing treatment and quenching are performed alonga specific direction in the introduced directional quenching method. The mechanical properties and fracography of crosssectionalfracture pattern of the heat treated samples are studied corresponding to the various heat treatments. Based on theobtained results, it is found that in comparison with the two conventional T6 and T8 heat treatment methods, the proposeddirectional quenching technique has the capability to increase simultaneously both of the ductility and strength of Al–Li 8090alloy. Also, according to the performed finite element based thermal stress analysis, it is observed that a uniform distributionand high volume fraction of strengthening δ′ (Al3Li) precipitates are acquired via the directional quenching technique.
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