Abstract
Experiments to assess the ability of the holographic/hole-drilling technique to accurately determine uniaxial stresses are described. The experimental data are in the form of optical interference fringe patterns. Different patterns obtained by varying the direction of laser light illuminating a test specimen with respect to the direction of stress are shown. Stresses estimated by the technique are compared with known values in specimens of aluminum alloy 7075-T651 and hardened Type 304L stainless steel.
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Abbreviations
- \(\tilde a,\tilde b,\tilde c\) :
-
nondimensional coefficients derived from\(\bar A,\bar B,\bar C\)
- h :
-
depth of blind hole
- n 0 i :
-
fringe count from starting location\(\theta _i \)
- r :
-
radial coordinate
- r 0 :
-
radius of blind hole
- \(\tilde A,\tilde B,\tilde C\) :
-
coefficients relating hole-drilling induced displacements to residual stresses
- D :
-
diameter of blind hole
- E :
-
modulus of elasticity
- K 0 x ,K 0 y :
-
Cartesian components of the sensitivity vector
- \(\gamma _1 \) :
-
grazing angle of illumination
- \(\gamma _2 \) :
-
angle between viewing direction and specimen surface
- ζ:
-
inclination of illumination direction
- \(\theta _i \) :
-
orientation of starting location of fringe count relative to illumination direction
- λ:
-
wavelength of illumination source
- ν:
-
Poisson's ratio
- \(\sigma _{xx} ,\sigma _{yy} ,\tau _{xy} \) :
-
components of stress tensor for biaxial stress
- \(\sigma _1 ,\sigma _2 \) :
-
principal stresses
References
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D. Williams was Senior Technical Aide, Sandia National Laboratories.
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Nelson, D., Fuchs, E., Makino, A. et al. Residual-stress determination by single-axis holographic interferometry and hole drilling—Part II: Experiments. Experimental Mechanics 34, 79–88 (1994). https://doi.org/10.1007/BF02328444
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DOI: https://doi.org/10.1007/BF02328444