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An investigation of the hole-drilling technique for measuring planar residual stress in rectangularly orthotropic materials

Exploratory investigation indicates that the hole-drilling technique can successfully be used in rectangularly orthotropic materials. Tests show that drill through is warranted for thin materials

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Abstract

The applicability of the semidestructive holedrilling technique to the experimental determination of residual stresses in relatively thin rectangularly orthotropic materials was investigated. From the exploratory work, it was determined that the similitudes, for measurements at a particular ratio of hole depth to diameter, which exist for thick materials are not present in relatively thin materials. This implies that calibration tests must be made for each combination of strain-gage size and plate thickness.

As a consolation, however, it was found that there is no need to drill to an optimum depth for thin materials. That is, one may simply drill a small hole completely through the material to obtain the desired strain change.

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Abbreviations

A, B :

calibration constants

E :

Young's modulus

G :

shear modulus associated with direction 1,2

k :

general constant

α:

general angle measured from the major material-symmetry axis

∈:

strain

∈(α):

strain change at some angle α

v :

Poisson's ratio

a, b, c :

rosette elements at 0, 45 and 90 deg

11, 22:

normal stress, normal strain or elastic constants associated with directions 1, 2

12:

shear stress or shear strain in direction 2 acting on face normal to direction 1

1, 2:

major and minor material-symmetry directions

1,…, 5:

designations for different general constants,k

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Authors and Affiliations

  1. School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, Oklahoma

    B. R. Lake (Graduate Student), F. J. Appl (Associate Professor) & C. W. Bert (Professor)

Authors
  1. B. R. Lake
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  2. F. J. Appl
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  3. C. W. Bert
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Lake, B.R., Appl, F.J. & Bert, C.W. An investigation of the hole-drilling technique for measuring planar residual stress in rectangularly orthotropic materials. Experimental Mechanics 10, 233–239 (1970). https://doi.org/10.1007/BF02324095

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  • DOI: https://doi.org/10.1007/BF02324095

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