the Crack Parallel to and Lying on the Interface in the Cermet Cladding Part.ppt

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2017-04-09 发布于江苏
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the Crack Parallel to and Lying on the Interface in the Cermet Cladding Part.ppt

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the Crack Parallel to and Lying on the Interface in the Cermet Cladding Part

Research on the Propagation of the Crack Parallel to and Lying on the Interface in the Cermet Cladding Part Yang Junru Shandong University of Science and Technology Contents 1. Introduction 2. Theoretical Research on the Propagation of the Crack Parallel to and Lying on the Interface 3. Example Investigation 4. Summary 1. Introduction The cermet cladding part is a new type of composite part by fabricating the cermet clad on the steel substrate. The interface crack fracture belongs to a complex fracture of I and II models. Up to now, the main fracture theories about complex crack propagation are the maximum circumference tension stress fracture criterion, the maximum energy release rate (MERR) theory and the minimum strain energy density theory. Among them, the MERR theory has wide adaptability. But it is mainly suitable for the complex crack in the homogenous material, they are not reasonable to the interface crack in the inhomogeneous material. In the paper, the propagation criterion suitable for the interface crack in the cermet cladding part is proposed, which is used to make the theoretical and example researches on the crack parallel to and lying on the interface in the cladding part. 2. Theoretical Research on the Propagation of the Crack Parallel to and Lying on the Interface 2.1 Propagation Criterion of the Interface Crack in the Cermet Cladding Part 2.2 Theoretical Researches on CPPPs of the Crack Parallel to and Lying on the Interface 2.2.1 CPi for the Crack Propagating along the Interface 2.2.2 CP1 for the Crack Deflecting to the Clad Layer 2.2.3 CP2 for the Crack Deflecting to the Substrate 2.1 Propagation Criterion of the Interface Crack in the Cermet Cladding Part MERR- maximum energy release rate CERR -critical energy release rate There is the relative ease for the interface crack propagation A new comparative propagation property parameter (CPPP) CP suitable to judge the crack propagation direction is proposed, which considers bo