Finite Element Model for Analysis of Characteristics of Shrouded Rotor Blade Vibrations

Abstract

The paper presents the approaches to FE modelling of blade airfoil, contact between the shrouds and operational damage. The regularities are established concerning the influence of the finite element type, finite element mesh and model of contact interaction on the spectrum of natural frequencies of blade assemblies. The use of the developed computational models is substantiated to determine the forced vibration characteristics of the selected objects of investigation. Based on the performed numerical experiments it was substantiated of finite element model selection for analysis of characteristics of shrouded rotor blade vibrations.

A Comparative Study of Various Models of Equivalent Plastic Strain to Fracture

“…In [1,6,8,11,12,20,23,27,28] ductile crack formation theory is constructed. In contrast to the approach [31,33,36], devoted to the study of crack growth, the approach considered in this paper is based on the models of summation of continuous material damage. In [20] fracture model, the base of the model being linear damage hypothesis and a notion of the fracture diagram which gives the equivalent plastic strain to fracture as a function of the stress state, is suggested.…”