Qiaoguo Wua [1,2], Xuedong Chena [1], Zhichao Fana [1], Defu Niea [1,2], Jianhua Pana [1]

[1] National Safety Engineering Technology Research Center for Pressure Vessels and Pipelines, Anhui Province Safety Technology Laboratory for Pressure Vessels and Pipelines, Hefei General Machinery Research Institute, Hefei 230031, China
[2] National Key Laboratory of Compressor Technology, Hefei General Machinery Research Institute, Hefei 230031, China

Engineering Fracture Mechanics, Volume 146, September 2015, Pages 210–223

Abstract

The dynamic fracture assessment method applied to a cracked centrifugal impeller subjected to dynamic loading is the focus of this study. J-integral histories and loading rates at crack tips were evaluated by numerical simulation through ABAQUS and Zencrack software. True stress–strain relations, fracture mechanism and fracture toughness of the impeller material FV520B steel were investigated over a wide range of loading rates by experimental and theoretical methods. Fracture assessment with consideration to rate effects was then conducted based on the CEGB R6 procedure. The present method demonstrated advantages over existing methods evaluated by an equivalent static load.

Keywords

Impeller; FV520B steel; Loading rate; Dynamic fracture; Failure assessment