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Load shedding effect on constant-ΔK testing

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Abstract

This paper investigates the effect of load shedding steps on constant-ΔK testing. ASTM fatigue crack growth specimens have been used in constant-ΔK tests for many fatigue investigations. In the tests, load levels need to be gradually stepped down to keep the stress intensity factor constant. This work points out that care should be taken in choosing the length of the step in order to control ΔK variation. Formulas for ΔK as well as crack growth rate variability are derived. The experimental application of these techniques is also presented.

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References

  1. Zhou, Z. andZwerneman, F.J., “Fatigue Damage Due to Sub-threshold Load Cycles between Periodic Overloads,”Advances in Fatigue Lifetime Predictive Techniques: Second Volume, ASTM STP I211 ed. M.R. Mitchell andR.W. Landgraf, American Society for Testing and Materials, Philadelphia PA, 45–53 (1993).

    Google Scholar 

  2. Zwerneman, F.J. and Frank, K.H., “Crack Opening under Variable Amplitude Loads,” Fracture Mechanics: Perspectives and Directions, 20th Symposium, ASTM STP 1020, American Society for Testing and Materials, 548–565 (1989).

  3. Lindley, T.C., Palmer, I.G. andRichards, C.E., “Acoustic Emission Monitoring of Fatique Crack Growth,”Mat. Sci. Eng.,32,1–15 (1978).

    Article  Google Scholar 

  4. Morton, T.M., Smith, S. andHarrington, R.M., “Effect of Loading Variables on the Acoustic Emissions of Fatigue-crack Growth,”Experimental Mechanics,14,208–213 (1974).

    Article  Google Scholar 

  5. Von Euw, E.F.J., Hertzberg, R.W. andRoberts, R.W., “Delay Effects in Fatigue Crack Propagation,”Stress Analysis and Growth of Cracks, ASTM STP 513, American Society for Testing and Materials, Philadelphia, PA, 230–259 (1972).

    Google Scholar 

  6. Morton, T.M., Harrington, R.M. andBjeletich, J.G., “Acoustic Emissions of Fatigue Crack Growth,”Eng. Fract. Mech.,5,691–697 (1973).

    Google Scholar 

  7. Vecchio, R.S., Jablonski, D.A., Lee, B.H., Hertzberg, R.W., Newton, C.N., Roberts, R., Chen, G. andConnelly, G., “Development of an Automated Fatigue Crack Propagation Test System,”Automated Test Methods for Fracture and Fatigue Crack Growth, ASTM STP 877, ed. W.H. Cullen, R.W. Landgraf, L.R. Kaisand andJ.H. Underwood, American Society for Testing and Materials, Philadelphia, PA, 44–66 (1985).

    Google Scholar 

  8. Van Der Sluys, W.A. andFutato, R.J., “Experience with Automated Fatigue Crack Growth Experiments,”Automated Test Methods for Fracture and Fatigue Crack Growth, ASTM STP, 877, ed. W.H. Cullen, R.W. Landgraf, L.R. Kaisand andJ.H. Underwood, American Society for Testing and Materials, Philadelphia, PA, 132–147 (1985).

    Google Scholar 

  9. Nanstad, R.K., Alexander, D.J., Swain, R.L., Hutton, J.T. andThomas, D.L., “A Computer-controlled Automated Test System for Fatigue and Fracture Testing,”Applications of Automation Technology to Fatigue and Fracture Testing, ASTM STP 1092, ed. A.A. Braun, N.E. Ashbaugh andF.M. Smith, American Society for Testing and Materials, Philadelphia, PA, 7–20 (1990).

    Google Scholar 

  10. Hartman, G.A. andAshbaugh, N.E., “A Fracture Mechanics Test Automation System for a Basic Research Laboratory,”Applications of Automation Technology to Fatigue and Fracture Testing, ASTM STP 1092, ed. A.A. Braun, N.E. Ashbaugh andF.M. Smith, American Society for Testing and Materials, Philadelphia, PA, 95–100 (1990).

    Google Scholar 

  11. Donald, J.K., “Automated Variable-amplitude Fatigue Crack Growth Technology,”Applications of Automation Technology to Fatigue and Fracture Testing, ASTM STP 1092, ed. A.A. Braun, N.E. Ashbaugh andF.M. Smith, American Society for Testing and Materials, Philadelphia, PA, 167–177 (1990).

    Google Scholar 

  12. Earthman, J.C., “Use of Computer System in High-temperature Crack Growth Studies,”Applications of Automation Technology to Fatigue and Fracture Testing, ASTM STP 1092, ed. A.A. Braun, N.E. Ashbaugh andF.M. Smith, American Society for Testing and Materials, Philadelphia, PA, 178–187 (1990).

    Google Scholar 

  13. Sunder, R., “Automated Fatigue and Fracture Laboratory with Multiple Load Frame and Single Host Computer System,”Applications of Automation Technology to Fatigue and Fracture Testing, ASTM STP 1092, ed. A.A. Braun, N.E. Ashbaugh andF.M. Smith, American Society for Testing and Materials, Philadelphia, 232–249 (1990).

    Google Scholar 

  14. American Society for Testing and Materials, Annual Book of ASTM Standards, Vol. 03.01, American Society for Testing and Materials, Philadelphia, PA (1993).

    Google Scholar 

  15. Paris, P.C. andErdogan, F.E., “A Critical Analysis of Crack Propagation Laws,”J. Basic Eng., ASME Transactions, Series D,85,528–534 (1963).

    Google Scholar 

  16. Zhou, Z., “Fatique Damage under Variable Amplitude Loads,” PhD Dissertation, Oklahoma State University (July 1991).

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Authors and Affiliations

  1. Manlift Engineering Division, Worldwide Grove, 17256, Shady Grove, PA

    Z. Zhou (Technical Manager)

  2. School of Civil and Environmental Engineering, Oklahoma State University, 74078-0327, Stillwater, OK

    F. J. Zwerneman (Professor)

Authors
  1. Z. Zhou
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  2. F. J. Zwerneman
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Zhou, Z., Zwerneman, F.J. Load shedding effect on constant-ΔK testing. Experimental Mechanics 36, 232–236 (1996). https://doi.org/10.1007/BF02318012

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  • DOI: https://doi.org/10.1007/BF02318012

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