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.
Highlights
The experimental semi-destructive hole drilling principle for the stress state identification is based on the assumption, that the free surface is one of the principal planes and the stress state in the surface layer can be only a uniaxial or plane one
The Hole drilling strain-gage method used for the residual stress state identification is currently standardized by the E 837 international standard [3]
This hole drilling method theory is based on two parameters adjusted for particular designs of drilling rosettes and requires very accurate the experimental hole drilling [5, 6]
Summary
The experimental semi-destructive hole drilling principle for the stress state identification is based on the assumption, that the free surface is one of the principal planes and the stress state in the surface layer can be only a uniaxial or plane one. The Hole drilling strain-gage method used for the residual stress state identification is currently standardized by the E 837 international standard [3] This hole drilling method theory is based on two parameters adjusted for particular designs of drilling rosettes and requires very accurate the experimental hole drilling [5, 6]. It is valid for isotropic Hooke’s materials with a known strain response to the drilling of the hole. This paper on the elimination of the influence of the drilled hole eccentricity on the stress evaluation by the drilling method is actual [7, 8, 14 ]
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