Static fracture and modal analysis simulation of a gas turbine compressor blade and bladed disk system

Ralston Fernandes, Sami El-Borgi, Khaled Ahmed, Michael I. Friswell, Nidhal Jamia

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper presents a methodology for conducting a 3-D static fracture analysis with applications to a gas turbine compressor blade. An open crack model is considered in the study and crack-tip driving parameters are estimated by using 3-D singular crack-tip elements in ANSYS®. The static fracture analysis is verified with a special purpose fracture code (FRANC3D). Once the crack front is perfectly defined and validated, a free vibration study is conducted by analyzing the natural frequencies and modeshapes for both a single blade and bladed disk system. Taking advantage of high performance computing resources, a high fidelity finite element model is considered in the parametric investigation. In the fracture simulation, the influence of the size of a single edged crack as well as the rotational velocity on fracture parameters (stress intensity factors and J-Integral) are evaluated. Results demonstrate that for the applied loading condition, a mixed mode crack propagation is expected. In the modal analysis study, increasing the depth of the crack leads to a decrease in the natural frequencies of both the single blade and bladed disk system, while increasing the rotational velocity increases the natural frequencies. The presence of a crack also leads to mode localization for all mode families, a phenomenon that cannot be captured by a single blade analysis.

Original languageEnglish
Article number30
JournalAdvanced Modeling and Simulation in Engineering Sciences
Volume3
Issue number1
DOIs
Publication statusPublished - 1 Dec 2016

    Fingerprint

Keywords

  • Bladed disk system
  • Crack
  • Finite element analysis
  • Single blade
  • Singular elements
  • Static and modal analysis

ASJC Scopus subject areas

  • Modelling and Simulation
  • Applied Mathematics
  • Computer Science Applications
  • Engineering (miscellaneous)

Cite this