STUDY ON THE NONLINEAR DYNAMIC RESPONSE OF A BEAM WITH A BREATHING CRACK

PDF(1408 KB)

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (1) : 76-80,8.

论文

STUDY ON THE NONLINEAR DYNAMIC RESPONSE OF A BEAM WITH A BREATHING CRACK

Hu JiaShun,Feng Xin,Zhou Jing

Author information +

History +

Abstract

Fatigue crack is one of the main damages existing on the structural members, which can lead to structure failure due to repeated loads. The nonlinear dynamic characteristics of a cantilever beam with a non-propagating asymmetric fatigue crack subjected to a harmonic load at the tip are studied. A breathing crack model is introduced to describe the nonlinear dynamic behavior of fatigue crack and can be simulated as a frictionless contact plane problem. Meanwhile, the quarter-point element is used to simulate the crack tip effects. Based on the proposed model, the effects of various factors, such as the excitation frequency, crack depth and crack position on nonlinear dynamic characteristics are discussed in detail. A relatively amplitude of system frequency is proposed to detect the crack severity based on the analysis of the sub-harmonics and super-harmonics at the crack interfaces. The results provide theory and reference for damage identification of cracked structure at some extent.

Key words

breathing crack / contact analysis / sub-harmonics / super-harmonics / amplitude spectra

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Hu JiaShun;Feng Xin;Zhou Jing. STUDY ON THE NONLINEAR DYNAMIC RESPONSE OF A BEAM WITH A BREATHING CRACK[J]. Journal of Vibration and Shock, 2009, 28(1): 76-80,8