Determination of effect of elliptic notches and grooves on stress concentration factors on notched bar in tension and grooved shaft under torsion

Authors

  • Rumman Ul Ahsan Bangladesh University of Engineering and Technology
  • Protyasha Prachurja Bangladesh University of Engineering and Technology
  • Abu Raihan Mohammad Ali Bangladesh University of Engineering and Technology
  • Mohammad Arif Hasan Mamun Bangladesh University of Engineering and Technology

DOI:

https://doi.org/10.3329/jname.v10i1.13675

Keywords:

Notch and groove, stress concentration factor, elliptic notch, finite element, Von-Mises stress.

Abstract

Stress concentration of structural members can be reduced considerably by the judicious choice of elliptic shaped stress raisers like notch and groove. Substantial effort has been given by numerous researchers to accurately measure the effect of such stress raisers, particularly of semicircular shaped notch and groove. An exhaustive bibliographical study proved that there is scope to investigate further and establish an alternative design criteria; concerning the elliptic geometry. Computational method, primarily the finite element method has been used to analyze the models under loading.

This paper suggests the use of a modified elliptic shape which gives less stress concentration when compared to semicircular notch and groove. The ratio of minor and major half axes of the ellipse should be between 0.3 and 0.4. The introduction of shoulder with elliptic notch and groove even reduces the stress concentration. The results obtained from FEM analysis propose optimal values of geometrical design parameters. The study represents not only a precise view of stress distribution, but also to develop charts that can be used by designer for practical purposes.

DOI: http://dx.doi.org/10.3329/jname.v10i1.13675

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Author Biographies

Rumman Ul Ahsan, Bangladesh University of Engineering and Technology

Department of Mechanical Engineering

Protyasha Prachurja, Bangladesh University of Engineering and Technology

M.Sc student, Department of Mechanical Engineering

Abu Raihan Mohammad Ali, Bangladesh University of Engineering and Technology

Professor, Department of Mechanical Engineering

Mohammad Arif Hasan Mamun, Bangladesh University of Engineering and Technology

Professor, Department of Mechanical Engineering

References

Chiang, C-R (2011): A design equation for the stress concentration factor of an oblate ellipsoidal cavity, Journal of Strain Analysis for Engineering Design, Vol. 46, pp. 87-94

doi: 10.1243/03093247JSA714

Pedersen, N.L., Pedersen, P. (2007): Design of notches and grooves by means of elliptic shapes, Journal of Strain Analysis, Vol. 43, issue no. 10

Petersen, R.E. (1974): Stress Concentration Factors, 1st edition, John Wiley & Sons, New York, USA

Pilkey, W.D., Pilkey, D.F. (2008): Petersons Stress Concentration Factors, 3rd edition, John Wiley & Sons, New York, USA

PMid: 17498997

Snowberger, D. (2008): Stress concentration factor convergence study of a flat plate with an elliptic hole under elastic loading conditions, Master thesis, Rensselaer Polytechnic Institute, Connecticut, USA

She, C., Zhao, J., Guo, W. (2008): Three-dimensional stress fields near notches and cracks, International Journal of Fracture, Vol.151, issue no. 2, pp. 151-160.

http://dx.doi.org/10.1007/s10704-008-9247-x

Yang, Z. (2009): The stress and strain concentrations of an elliptical hole in an elastic plate of finite thickness subjected to tensile stress, International Journal of Fracture, Vol. 155, issue no. 1, pp. 43-54.

http://dx.doi.org/10.1007/s10704-009-9320-0

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Published

25.06.2013

How to Cite

Ahsan, R. U., Prachurja, P., Ali, A. R. M., & Mamun, M. A. H. (2013). Determination of effect of elliptic notches and grooves on stress concentration factors on notched bar in tension and grooved shaft under torsion. Journal of Naval Architecture and Marine Engineering, 10(1), 25–32. https://doi.org/10.3329/jname.v10i1.13675

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