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INVESTIGATIONS ON THE FORMATION OF INITIAL CRACKS IN THERMAL BARRIER COATINGS PREPARED BY EB-PVD

S.K.Gong , L. Deng , F.S.Liu and H.B.Xu(Department of Material Science and Engineering , Beijing University of Aeronautics and Astronautics , Beijing 100083 , China Manuscript received 26 August 1996)

金属学报(英文版)

This paper deals with the mechanism of the formation of initial cracks in the yttria partially stabilized zirconia thermal barrier coatings prepared by EB-PVD method.The microcracks were only recognized inside the ceramic top coat of the thermalcycled TBCs. SEM/EDS observations indicated that some special oxides exist in the area just below the cracks.It seems that the formation of the initial cracks can result from the oxidation stress as well as the thermal stress.

关键词: :TBCs , null , null , null

CFRP加固含初始裂纹的RC梁的抗爆性能研究

曲艳东 , 李鑫 , 刘万里 , 章文姣 , 孔祥清

玻璃钢/复合材料

碳纤维复合材料(CFRP)加固建筑结构是一种新兴的加固技术.国内外鲜有CFRP加固含初始裂纹的结构构件(如RC梁)的抗爆性能的研究报道.基于大型非线性动力学分析软件LS-DYNA,从加固层数和加固宽度两方面对CFRP局部全包裹加固含初始裂纹RC梁(裂纹梁)的抗爆性能进行非线性有限元数值分析.研究表明,采用CFRP对裂纹梁的裂纹处进行局部全包裹加固可提高裂纹梁的整体刚度,减小其在爆炸荷载作用下的损伤和变形程度.当CFRP的加固层数为4层、加固宽度为300mm时,可有效提高裂纹梁的抗爆性能.该研究成果对建筑结构抗爆设计和抗爆加固研究具有一定的指导意义.

关键词: RC梁 , 初始裂纹 , 抗爆性 , 爆炸荷载 , 碳纤维布

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