Fatigue Life Prediction of an Impeller Based on Fracture Mechanics

DOI

10.2991/msam-15.2015.4How to use a DOI?

Keywords

impeller; life prediction; equivalent model; stress intensity factor; crack propagation

Abstract

Welding structure is widely used in impellers fitted on the large centrifugal compressor and the crack propagation life prediction is studied based on the fracture mechanics. First the finite element structure strength analysis is carried on the three-dimensional entity model of the impeller, and the dangerous area of the structure is determined. Then based on the mechanical similarity and geometric similarity principles, a simplified two- dimensional model of the dangerous area is established. According to the simplified model, the stress intensity factors of two typical kinds of the center crack and the edge crack are calculated and functions of the stress intensity factor changed with the crack length are obtained. Finally, using the mixed mode crack propagation model, the fatigue crack propagation life of the edge crack is estimated by iterative method. The fatigue life prediction method and calculation procedure of the impeller structure is summed up based on the fracture mechanics.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Lei Wang
AU  - Tianzhong Sui
PY  - 2015/08
DA  - 2015/08
TI  - Fatigue Life Prediction of an Impeller Based on Fracture Mechanics
BT  - Proceedings of the 2015 International Conference on Modeling, Simulation and Applied Mathematics
PB  - Atlantis Press
SP  - 15
EP  - 19
SN  - 1951-6851
UR  - https://doi.org/10.2991/msam-15.2015.4
DO  - 10.2991/msam-15.2015.4
ID  - Wang2015/08
ER  -