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On-line Access: 2012-01-04

Received: 2011-02-20

Revision Accepted: 2011-05-19

Crosschecked: 2011-12-06

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.1 P.1-8

http://doi.org/10.1631/jzus.A1100040


Stress intensity factors under combined bending and torsion moments


Author(s):  Al Emran Ismail, Ahmad Kamal Ariffin, Shahrum Abdullah, Mariyam Jameelah Ghazali, Mohammed Abdulrazzaq, Ruslizam Daud

Affiliation(s):  Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat 86400, Johor, Malaysia; more

Corresponding email(s):   emran@uthm.edu.my

Key Words:  Stress intensity factor (SIF), Combined loadings, Finite element analysis (FEA), Surface cracks, Round solid bars


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Al Emran Ismail, Ahmad Kamal Ariffin, Shahrum Abdullah, Mariyam Jameelah Ghazali, Mohammed Abdulrazzaq, Ruslizam Daud. Stress intensity factors under combined bending and torsion moments[J]. Journal of Zhejiang University Science A, 2012, 13(1): 1-8.

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volume="13",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1100040"
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%T Stress intensity factors under combined bending and torsion moments
%A Al Emran Ismail
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%A Shahrum Abdullah
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%A Mohammed Abdulrazzaq
%A Ruslizam Daud
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
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T1 - Stress intensity factors under combined bending and torsion moments
A1 - Al Emran Ismail
A1 - Ahmad Kamal Ariffin
A1 - Shahrum Abdullah
A1 - Mariyam Jameelah Ghazali
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A1 - Ruslizam Daud
J0 - Journal of Zhejiang University Science A
VL - 13
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DOI - 10.1631/jzus.A1100040


Abstract: 
This paper discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined torsion and bending loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and relative crack depths, a/D, ranging from 0.1 to 0.6 were considered. Since the loading was non-symmetrical for torsion loadings, a whole finite element model was constructed. Then, the individual and combined bending and torsion loadings were remotely applied to the model. The equivalent SIF method, F*EQ, was then used explicitly to combine the individual SIFs from the bending and torsion loadings. A comparison was then carried out with the combined SIF, F*FE, obtained using the finite element analysis (FEA) under similar loadings. It was found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results determined from the different approaches occurred when FIII was involved. It was also noted that the predicted F*FE using FEA was higher than the F*EQ predicted through the equivalent SIF method due to the difference in crack face interactions.

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