Stress intensity factors under combined tension and torsion loadings

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Abstract

This paper numerically discusses the stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined loadings. Different crack aspect ratios, a/b ranged 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 loading is non-symmetrical, the whole finite element model is constructed. Then, both tension and torsion loadings are remotely applied to the finite element model and the SIFs are determined along the crack front of various crack geometries. An equivalent SIF method is then explicitly used to combine the individual SIF obtained using different loadings. A comparison is made between the combined SIFs obtained using the equivalent SIF method and finite element analysis (FEA) under similar loadings. It is found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results, which have been determined from the different approaches, occurred when FIII is involved. Meanwhile, it is also noted that the predicted SIF using FEA is higher than the predicted through the equivalent SIF method due to the crack face interactions.

Original languageEnglish
Pages (from-to)5-16
Number of pages12
JournalIndian Journal of Engineering and Materials Sciences
Volume19
Issue number1
Publication statusPublished - Feb 2012

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Stress intensity factors
Torsional stress
Cracks
Finite element method
Aspect ratio
Geometry

Keywords

  • Combined loadings
  • Finite element analysis
  • Stress intensity factor
  • Surface crack

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

Cite this

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title = "Stress intensity factors under combined tension and torsion loadings",
abstract = "This paper numerically discusses the stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined loadings. Different crack aspect ratios, a/b ranged 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 loading is non-symmetrical, the whole finite element model is constructed. Then, both tension and torsion loadings are remotely applied to the finite element model and the SIFs are determined along the crack front of various crack geometries. An equivalent SIF method is then explicitly used to combine the individual SIF obtained using different loadings. A comparison is made between the combined SIFs obtained using the equivalent SIF method and finite element analysis (FEA) under similar loadings. It is found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results, which have been determined from the different approaches, occurred when FIII is involved. Meanwhile, it is also noted that the predicted SIF using FEA is higher than the predicted through the equivalent SIF method due to the crack face interactions.",
keywords = "Combined loadings, Finite element analysis, Stress intensity factor, Surface crack",
author = "Ismail, {A. E.} and {Mohd Ihsan}, {Ahmad Kamal Ariffin} and Shahrum Abdullah and Ghazali, {Mariyam Jameelah}",
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TY - JOUR

T1 - Stress intensity factors under combined tension and torsion loadings

AU - Ismail, A. E.

AU - Mohd Ihsan, Ahmad Kamal Ariffin

AU - Abdullah, Shahrum

AU - Ghazali, Mariyam Jameelah

PY - 2012/2

Y1 - 2012/2

N2 - This paper numerically discusses the stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined loadings. Different crack aspect ratios, a/b ranged 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 loading is non-symmetrical, the whole finite element model is constructed. Then, both tension and torsion loadings are remotely applied to the finite element model and the SIFs are determined along the crack front of various crack geometries. An equivalent SIF method is then explicitly used to combine the individual SIF obtained using different loadings. A comparison is made between the combined SIFs obtained using the equivalent SIF method and finite element analysis (FEA) under similar loadings. It is found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results, which have been determined from the different approaches, occurred when FIII is involved. Meanwhile, it is also noted that the predicted SIF using FEA is higher than the predicted through the equivalent SIF method due to the crack face interactions.

AB - This paper numerically discusses the stress intensity factor (SIF) calculations for surface cracks in round bars subjected to combined loadings. Different crack aspect ratios, a/b ranged 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 loading is non-symmetrical, the whole finite element model is constructed. Then, both tension and torsion loadings are remotely applied to the finite element model and the SIFs are determined along the crack front of various crack geometries. An equivalent SIF method is then explicitly used to combine the individual SIF obtained using different loadings. A comparison is made between the combined SIFs obtained using the equivalent SIF method and finite element analysis (FEA) under similar loadings. It is found that the equivalent SIF method successfully predicted the combined SIF for Mode I. However, discrepancies between the results, which have been determined from the different approaches, occurred when FIII is involved. Meanwhile, it is also noted that the predicted SIF using FEA is higher than the predicted through the equivalent SIF method due to the crack face interactions.

KW - Combined loadings

KW - Finite element analysis

KW - Stress intensity factor

KW - Surface crack

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