Stress intensity factors for surface cracks in round bar under single and combined loadings

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Abstract

This paper numerically discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to single and combined loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and the relative crack depth, a/D, in the range of 0.1 to 0.6 are considered. Since the torsion loading is non-symmetrical, the whole finite element model has been constructed, and the loadings have been remotely applied to the model. The equivalent SIF, F*EQ is then used to combine the individual SIF from the bending or tension with torsion loadings. Then, it is compared with the combined SIF, F*FE obtained numerically using the finite element analysis under similar loadings. It is found that the equivalent SIF method successfully predicts the combined SIF, F*EQ forMode I when compared with F*FE. However, some discrepancies between the results, determined from the two different approaches, occur when FIII is involved. Meanwhile, it is also noted that the F*FE is higher than the F*EQ due to the difference in crack face interactions and deformations.

Original languageEnglish
Pages (from-to)1141-1156
Number of pages16
JournalMeccanica
Volume47
Issue number5
DOIs
Publication statusPublished - Jun 2012

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surface cracks
stress intensity factors
Stress intensity factors
Cracks
combined stress
cracks
Torsional stress
torsion
aspect ratio
Aspect ratio
Finite element method
interactions

Keywords

  • Combined stress intensity factors
  • Crack face interactions
  • Finite element analysis
  • Surface crack

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

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title = "Stress intensity factors for surface cracks in round bar under single and combined loadings",
abstract = "This paper numerically discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to single and combined loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and the relative crack depth, a/D, in the range of 0.1 to 0.6 are considered. Since the torsion loading is non-symmetrical, the whole finite element model has been constructed, and the loadings have been remotely applied to the model. The equivalent SIF, F*EQ is then used to combine the individual SIF from the bending or tension with torsion loadings. Then, it is compared with the combined SIF, F*FE obtained numerically using the finite element analysis under similar loadings. It is found that the equivalent SIF method successfully predicts the combined SIF, F*EQ forMode I when compared with F*FE. However, some discrepancies between the results, determined from the two different approaches, occur when FIII is involved. Meanwhile, it is also noted that the F*FE is higher than the F*EQ due to the difference in crack face interactions and deformations.",
keywords = "Combined stress intensity factors, Crack face interactions, Finite element analysis, Surface crack",
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AU - Ismail, A. E.

AU - Mohd Ihsan, Ahmad Kamal Ariffin

AU - Abdullah, Shahrum

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N2 - This paper numerically discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to single and combined loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and the relative crack depth, a/D, in the range of 0.1 to 0.6 are considered. Since the torsion loading is non-symmetrical, the whole finite element model has been constructed, and the loadings have been remotely applied to the model. The equivalent SIF, F*EQ is then used to combine the individual SIF from the bending or tension with torsion loadings. Then, it is compared with the combined SIF, F*FE obtained numerically using the finite element analysis under similar loadings. It is found that the equivalent SIF method successfully predicts the combined SIF, F*EQ forMode I when compared with F*FE. However, some discrepancies between the results, determined from the two different approaches, occur when FIII is involved. Meanwhile, it is also noted that the F*FE is higher than the F*EQ due to the difference in crack face interactions and deformations.

AB - This paper numerically discusses stress intensity factor (SIF) calculations for surface cracks in round bars subjected to single and combined loadings. Different crack aspect ratios, a/b, ranging from 0.0 to 1.2 and the relative crack depth, a/D, in the range of 0.1 to 0.6 are considered. Since the torsion loading is non-symmetrical, the whole finite element model has been constructed, and the loadings have been remotely applied to the model. The equivalent SIF, F*EQ is then used to combine the individual SIF from the bending or tension with torsion loadings. Then, it is compared with the combined SIF, F*FE obtained numerically using the finite element analysis under similar loadings. It is found that the equivalent SIF method successfully predicts the combined SIF, F*EQ forMode I when compared with F*FE. However, some discrepancies between the results, determined from the two different approaches, occur when FIII is involved. Meanwhile, it is also noted that the F*FE is higher than the F*EQ due to the difference in crack face interactions and deformations.

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