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CLC number: TK427

On-line Access: 2008-01-18

Received: 2007-09-25

Revision Accepted: 2007-12-15

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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.3 P.346~350


Fatigue crack growth rate test using a frequency sweep method

Author(s):  Xun ZHOU, Xiao-li YU

Affiliation(s):  College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   zhouxun@zju.edu.cn, yuxl@zju.edu.cn

Key Words:  Crack growth rate, Residual stress, Frequency sweep method, Engine crankshaft, Reliability

Xun ZHOU, Xiao-li YU. Fatigue crack growth rate test using a frequency sweep method[J]. Journal of Zhejiang University Science A, 2008, 9(3): 346~350.

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author="Xun ZHOU, Xiao-li YU",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Fatigue crack growth rate test using a frequency sweep method
%A Xiao-li YU
%J Journal of Zhejiang University SCIENCE A
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%P 346~350
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0720009

T1 - Fatigue crack growth rate test using a frequency sweep method
A1 - Xun ZHOU
A1 - Xiao-li YU
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 3
SP - 346
EP - 350
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0720009

Fatigue crack propagation characteristics of a diesel engine crankshaft are studied by measuring the fatigue crack growth rate using a frequency sweep method on a resonant fatigue test rig. Based on the phenomenon that the system frequency will change when the crack becomes large, this method can be directly applied to a complex component or structure. Finite element analyses (FEAs) are performed to calibrate the relation between the frequency change and the crack size, and to obtain the natural frequency of the test rig and the stress intensity factor (SIF) of growing cracks. The crack growth rate i.e. da/dNK of each crack size is obtained by combining the testing-time monitored data and FEA results. The results show that the crack growth rate of engine crankshaft, which is a component with complex geometry and special surface treatment, is quite different from that of a pure material. There is an apparent turning point in the Paris’s crack partition. The cause of the fatigue crack growth is also discussed.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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