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Experimental method for and theoretical research on defect tolerance of fxed plate based on damage mechanics

Chinese Journal of Aeronautics 2013年第5期26卷 1195-1201页

作者： Zhan Zhixin Hu Weiping Zhang Miao Zhu Yuefa Meng Qingchun Institute of Solid Mechanics School of Aeronautic Science and EngineeringBeiHang University Institute of Manned Space System Engineering China Academy of Space Technology Harbin Aircraft Manufacturing Company

An experimental method and a theoretical analysis based on continuum damage mechan- ics are applied for the defects tolerance of fixed plate. The defects type studied in this article is scratch, which is considered a typical defect on fixed plate according to the engineering practice. The general approach to the defects tolerance analysis of scratched fixed plate is presented. The method of fatigue life prediction for standard notched specimens has been established on the basis of continuum damage mechanics. For the purpose of obtaining the influence law of fatigue life in consequence of scratches, fatigue experiments of standard notched specimens and scratched specimens have been done. Evalu- ation of the fatigue life of scratched fixed plate has been carried out. And the value of scratch defects permissible to the condition of safety service life has been worked out. According to the results of the- oretical calculations, the fatigue experiment of scratched fixed plate has been performed. The outcome shows that the theoretical prediction tallies with the experimental results.

关键词： Damage mechanics defect tolerance Fatigue experiment Fixed plate Life prediction

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defect tolerance in chalcogenide perovskite photovoltaic material BaZrS_(3)

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Science China Materials 2021年第12期64卷 2976-2986页

作者： Xiaowei Wu Weiwei Gao Jun Chai Chen Ming Miaogen Chen Hao Zeng Peihong Zhang Shengbai Zhang Yi-Yang Sun State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China School of Physics Dalian University TechnologyDalian 116024China Center for Computational Materials Oden Institute for Computational Engineering and SciencesThe University of Texas at AustinAustinTX 78712United States College of Science China Jiliang UniversityHangzhou 310018China Department of Physics University at BuffaloThe State University of New YorkBuffaloNY 14260United States Department of Physics Applied Physics&AstronomyRensselaer Polytechnic InstituteTroyNY 12180United States

Chalcogenide perovskites(CPs) exhibiting lower band gaps than oxide perovskites and higher stability than halide perovskites are promising materials for photovoltaic and optoelectronic applications. For such applications, the absence of deep defect levels serving as recombination centers(dubbed defect tolerance) is a highly desirable property. Here,using density functional theory(DFT) calculations, we study the intrinsic defects in BaZrS_(3), a representative CP *** compare Hubbard-U and hybrid functional methods, both of which have been widely used in addressing the band gap problem of semi-local functionals in DFT. We find that tuning the U value to obtain experimental bulk band gap and then using the obtained U value for defect calculations may result in over-localization of defect states. In the hybrid functional calculation, the band gap of BaZrS_(3)can be accurately obtained. We observe the formation of small S-atom clusters in both methods, which tend to self-passivate the defects from forming mid-gap levels. Even though in the hybrid functional calculations several relatively deep defects are observed, all of them exhibit too high formation energy to play a significant role if the materials are prepared under thermal ***_(3)is thus expected to exhibit sufficient defect tolerance promising for photovoltaic and optoelectronic applications.

关键词： chalcogenide perovskite photovoltaics defect tolerance BaZrS3 first-principles calculation

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EFFECT OF CARBON AND BORON ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A SINGLE CRYSTAL SUPERALLOY RR 2072

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Acta Metallurgica Sinica(English Letters) 2005年第1期18卷 33-38页

作者： D.H.Kim D.H.Ye J.H.Lee Y.S.Yoo C.Y.Jo High Temperature Materials Laboratory Korea Institute of Machinery&Materials 66 SangnamChangwonKyungnam 640-010S.Korea Dept.of Metallurgy Changwon National Univerisity 9 SarimChagwonKyungnam 640-773S.Korea

Carbon and boron have been considered to strengthen grain boundaries that might form during single crystal *** this study the effect of boron on solidification behavior and creep properties of the carbon doped single crystal RR 2072 has been *** order to understand solidification behavior with boron addition,the solid/liquid interface morphology and solidification microstructure were examined with solidification *** relationship between mi-crostructural evolution and creep properties of the carbon and boron modified single crystal has been also investigated.

关键词： single crystal superalloy defect tolerance directional solidification creep rupture

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