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Experimental Mechanics

, Volume 10, Issue 6, pp 233–239 | Cite as

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
  • B. R. Lake
  • F. J. Appl
  • C. W. Bert
Article

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.

Keywords

Mechanical Engineer Residual Stress Fluid Dynamics Experimental Determination Plate Thickness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of Symbols

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

Subscripts

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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References

  1. 1.
    Sachs, G., “Der Nachweiss innerer Spannungen in Stangen und Rohren,”Z. Metallk.,19,352, (1927).Google Scholar
  2. 2.
    Treuting, R. G. andRead, W. T., Jr., “A Mechanical Determination of Biaxial Residual Stress in Sheet Materials,”Jnl. Appl. Phys.,22,130 (1951).CrossRefGoogle Scholar
  3. 3.
    Mathar, J., “Determination of Initial Stresses by Measuring the Deformations Around Drilled Holes,”Trans. ASME,56,249 (1934).Google Scholar
  4. 4.
    Kelsey, R. A., “Measuring Non-Uniform Residual Stresses by the Hole Drilling Method,”Proc. SESA, XIV (1),181 (1956).Google Scholar
  5. 5.
    Rendler, N. J. andVigness, I., “Hole-drilling Strain-gage Method of Measuring Residual Stresses,”Experimental Mechanics,6 (12),577 (1966).CrossRefGoogle Scholar
  6. 6.
    Bert, C. W. andThompson, G. L., “A Method for Measuring Planar Residual Stresses in Rectangularly Orthotropic Materials,”Jnl. Compos. Mater.,2, (4),244 (1968).Google Scholar
  7. 7.
    Lekhnitskii, S. G., Theory of Elasticity of an Anisotropic Elastic Body, Holden-Day, San Francisco, Calif., (1963).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1970

Authors and Affiliations

  • B. R. Lake
    • 1
  • F. J. Appl
    • 1
  • C. W. Bert
    • 1
  1. 1.School of Aerospace and Mechanical EngineeringUniversity of OklahomaNorman

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