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Crack-measurement techniques for high-temperature applications

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Conclusions

The experimental crack-length measurement data showed that both the laser and the X-ray approaches are viable. However, based on performance margins and system implementation considerations, the laser approach is recommended. A system design of a laser-automated fatigue-crack measurement instrument is presented in Fig. 12. A vision system is proposed to meet the performance requirements on Table 3. The laser and vision system are cart mounted for maximum utility. This configuration is shown in Fig. 13. A prototype system will be built and tested on the Phase II program. At the conclusion of Phase II, Foster-Miller will be looking for a venture partner to commercialize the system.

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References

  1. Bachman, V. and Nuns, D., “Fatigue Crack Closure Evaluation with the Potential Method,” Eng. Fract. Mech., 11, 61–71 (1979).

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  2. Rief, F., “Fundamental of Statistical and Thermal Physics,” McGraw-Hill, NY (1965).

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  3. Filter data sheets, Ealing Corp., Natick, MA, alternates: Micro-coatings, Westford, MA or Barr Associates, Westford, MA.

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Author information

Authors and Affiliations

  1. Foster-Miller, Inc., Waltham, MA, USA

    T. E. Kirchner (Principal Engineer) & L. Domash (Principal Scientist)

  2. AFWAL/Flight Dynamics Laboratory, Wright-Patterson Air Force Base, OH, USA

    A. Nagar (SEM Member, Aerospace Engineer)

  3. Skiametrics, Inc., Winchester, MA, USA

    P. Burstein (President)

Authors
  1. T. E. Kirchner
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  2. A. Nagar
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  3. L. Domash
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  4. P. Burstein
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Kirchner, T.E., Nagar, A., Domash, L. et al. Crack-measurement techniques for high-temperature applications. Exp Tech 12, 26–31 (1988). https://doi.org/10.1111/j.1747-1567.1988.tb02170.x

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  • DOI: https://doi.org/10.1111/j.1747-1567.1988.tb02170.x

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