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Different thermal fatigue behaviors between gray cast iron and vermicular graphite cast iron

China Foundry 2022年第3期19卷 245-252页

作者： Gui-quan Wang Zhong-li Liu Yan-xiang Li Xiang Chen School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005ShandongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

The initiation and propagation of thermal fatigue cracks in gray cast iron and vemicular graphite cast iron were investigated by Uddeholm method to reveal the complex thermal fatigue behaviors of cast *** of thermal fatigue behaviors of gray cast iron and vemicular graphite cast iron were observed and *** is found that the observed differences are related to the combination of graphite morphology and the oxidization of *** oxidized matrix is observed in gray cast iron due to its large specific surface *** brittle oxidized matrix facilitates the propagation of microcracks along the oxidization *** contrast,the radial microcracks are formed in vermicular graphite at the edge of graphite due to fewer oxidization *** indicates that the thermal fatigue resistance of gray cast iron is dominated by graphite content and morphology while that of vermicular graphite cast iron strongly relates to the strength of the matrix.

关键词： thermal fatigue gray cast iron vermicular graphite cast iron oxidization cracking propagation

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Numerical Simulation of Thermal Induced Crack propagation in Laminated Composites

Numerical Simulation of Thermal Induced Crack Propagation in...

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第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Tao XU1,2,a, Juying Yang1,b, Chun-an TANG2,c, Shibin TANG2,d 1 Center for Material Failure Modeling Research, Dalian University, Dalian 116622, China 2 School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China

A coupled thermo-mechanical model is employed to analyze the thermo-mechanical behavior of a widely used laminated composite subject to temperature decrease at service conditions. Three sets of governing equations, i.e. heat transfer, thermo-mechanical deformation and damage evolution are respectively described in the model. These equations are then assembled into a coupled matrix equation using finite element formulation and then solved simultaneously at each time interval. A numerical model of two layered composites with some preexisting equal-spacing cracks along the interface in the lower layer is set up to investigate the thermal induced crack propagation due to temperature decrease. Results are presented in the form of crack propagation process in stress profiles and discussed. Numerical simulations show that the crack propagation behavior of the composites is closely dependent on the physico-mechanical properties of two layers and preexisting cracks. It is found that thermal induced cracks penetrate into the upper layer and grow in the upper layer due to the low strength of the upper layer when the model is subject to uniform temperature decrease.

关键词： Thermal stress Laminated composites cracking propagation Coefficient of thermal expansion

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