Universal Journal of Mechanical Engineering Vol. 2(3), pp. 112 - 123
DOI: 10.13189/ujme.2014.020305
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Decomposition Theory of the Hole-Drilling Method for the Stress State Identification

Karel Vitek ^*
Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, 16607 Prague, Czech Republic

ABSTRACT

When determining stress states by the hole-drilling method, it is necessary to take into account the experiment performance accuracy. The drilled holes eccentricity appears as a frequent imperfection, which influences essentially the reliability of their stress state assessment. This paper presents the hole-drilling measurement method corresponding to the E 837 standard method, but, at the same time, it is more universal. This method transforms the full stress tensor of the drilled hole position by the regression coefficients and describes the state of strains released in the hole surrounding, based on the hole center distance and its depth. The regress coefficients are not defined in the method concretely for the rosette but they are universal both for the isotropic Hooke’s materials and for the other measuring elements. The method defines the way for the processing of the released strains measured with a defined measuring element and involves naturally the influence of the drilled hole eccentricity and so it is possible, in the hole-drilling method, to apply measuring elements more simply, without determining their specified regression coefficients.

KEYWORDS
Hole-Drilling Method, Residual Stress, Decomposition Theory, Regression Coefficients, Discretization

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Karel Vitek , "Decomposition Theory of the Hole-Drilling Method for the Stress State Identification," Universal Journal of Mechanical Engineering, Vol. 2, No. 3, pp. 112 - 123, 2014. DOI: 10.13189/ujme.2014.020305.

(b). APA Format:
Karel Vitek (2014). Decomposition Theory of the Hole-Drilling Method for the Stress State Identification. Universal Journal of Mechanical Engineering, 2(3), 112 - 123. DOI: 10.13189/ujme.2014.020305.