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A coherent gradient sensor for crack tip deformation measurements: analysis and experimental results

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Abstract

A first order diffraction analysis of an optical interferometer, Coherent Gradient Sensor (CGS), for measuring surface gradients is presented. Its applicability in the field of fracture mechanics is demonstrated by quantitatively measuring the gradients of out-of-plane displacements around a crack tip in a three point bent fracture specimen under static loading. This method has potential for the study of deformation fields near a quasi-statically or dynamically growing crack.

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References

  1. J.W. Dally, in Optical Methods in Mechanics of Solids, A. Lagarde (ed.), Sijthoff and Noordoff (1980).

  2. B.S.J. Kang, A.S. Kobayashi and D. Post, Experimental Mechanics 3 (1987) 234–245.

    Google Scholar 

  3. F.P. Chiang and T.V. Hareesh, International Journal of Fracture 36 (1988) 243–257.

    Google Scholar 

  4. A.J. Rosakis, A.T. Zehnder and R. Narasimhan, Optical Engineering 27, No. 8 (1988) 596–610.

    Google Scholar 

  5. J. Beinert and J.F. Kalthoff, in Mechanics of Fracture, Vol. VII, G. Sih (ed.), Sijthoff and Noordoff (1981) 281–320.

  6. A.J. Rosakis, C.C. Ma and L.B. Freund, Journal of Applied Mechanics 105 (1983) 777–782.

    Google Scholar 

  7. O. Kafri, Optics Letters 5 (1980) 555–557.

    Google Scholar 

  8. I. Glatt and O. Kafri, Optics and Lasers in Engineering 8 (1988) 277–320.

    Google Scholar 

  9. F.P. Chiang, in Manual of Stress Analysis Techniques, A.S. Kobayashi (ed.), SESA, 3rd ed. (1978).

  10. D.P. Rooke and D.P. Cartwright, Compendium of Stress Intensity Factors, Her Majesty's Stationery Office (1975).

  11. W. Yang and L.B. Freund, International Journal of Solids and Structures 21, No. 9 (1985) 977–994.

    Google Scholar 

  12. A.J. Rosakis and K. Ravi-Chandar, International Journal of Solids and Structures, 22 (1986) 121–138.

    Google Scholar 

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Author notes

  1. Hareesh V. Tippur

    Present address: Department of Mechanical Engineering, Auburn University, AL, USA

  2. Sridhar Krishnaswamy

    Present address: Department of Mechanical Engineering, Northwestern University, IL, USA

Authors and Affiliations

  1. Graduate Aeronautical Laboratories, California Institute of Technology, 91125, Pasadena, California, USA

    Hareesh V. Tippur, Sridhar Krishnaswamy & Ares J. Rosakis

Authors
  1. Hareesh V. Tippur
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  2. Sridhar Krishnaswamy
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  3. Ares J. Rosakis
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Tippur, H.V., Krishnaswamy, S. & Rosakis, A.J. A coherent gradient sensor for crack tip deformation measurements: analysis and experimental results. Int J Fract 48, 193–204 (1991). https://doi.org/10.1007/BF00036631

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  • DOI: https://doi.org/10.1007/BF00036631

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