Thermal Relaxation in Autofrettaged Cylinders

  • Joseph F. Throop
  • John H. Underwood
  • Gregory S. Leger
Part of the Sagamore Army Materials Research Conference Proceedings book series (SAMC, volume 28)


An experimental study of the loss of bore expansion and change of residual stresses in autofrettaged cylinders resulting from internal heating combined with external cooling provides information useful in the design of pressure vessels operating at high temperature, Two-foot long cylinders were heated internally to bore temperatures up to 950°F and simultaneously cooled externally to produce a temperature difference of as much as 725°F from bore to outside surface. Reduction of the autofrettage bore expansion and reduction of residual stresses resulted, because the thermal stresses added to the residual stresses and exceeded the lowered yield strength at elevated temperature, permitting relaxation to occur.

The data reveals that under certain temperature conditions a considerable portion of the autofrettage induced bore expansion and the associated residual stresses can be lost in a few minutes when external cooling occurs. The experimental results indicate that partial overstrain in autofrettage may be preferable to full overstrain in order to minimize the loss in residual stress.


Residual Stress Diameter Ratio Thermal Relaxation Bauschinger Effect Separation Angle 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    V. C. D. Dawson and J. W. Jackson, “Investigation of the Relaxation of Residual Stresses in Autofrettaged Cylinders,” Trans. of ASME, Jour, of Basic Engineering, Vol. 91, Series D, No. 1, pp. 63-66, (March 1969).Google Scholar
  2. 2.
    T. E. Davidson, C. S. Barton, A. N. Reiner, and D. P. Kendall, “Overstrain of High Strength, Open End Cylinders of Intermediate Diameter Ratio,” Proc. 1st International Congress on Experimental Mechanics, pp. 335-352, Pergamon Press, Oxford (1963).Google Scholar
  3. 3.
    S. Timoshenko and J. N. Goodier, “Theory of Elasticity,” Second Edition, McGraw Hill, NY (1951), pp. 60-69, Third Edition, McGraw Hill, NY (1970), pp. 68-80.Google Scholar
  4. 4.
    F. Kreith, “Principles of Heat Transfer,” International Textbook Co., Scranton, PA (1958), pp. 25-29.Google Scholar
  5. 5.
    A. P. Parker, J. H. Underwood, J. F. Throop, and C. P. Andrasic, “Stress Intensity and Fatigue Crack Growth in a Pressurized Autofrettaged Thick Cylinder,” presented in the ASTM 14th National Symposium on Fracture Mechanics on June 30, 1981, UCLA, Los Angeles, CA.Google Scholar

Copyright information

© Springer Science+Business Media New York 1982

Authors and Affiliations

  • Joseph F. Throop
    • 1
  • John H. Underwood
    • 1
  • Gregory S. Leger
    • 1
  1. 1.U.S. Army Armament Research and Development CommandLarge Caliber Weapon Systems Laboratory, Benet Weapons LaboratoryWatervlietUSA

Personalised recommendations