In-situ measurements of three-dimensional displacement fields in shear crack growth using phase-shifted speckle interferometry

David W. Watt; Ronald U. Goulet; Todd S. Gross

doi:10.1117/12.212637

23 June 1995 In-situ measurements of three-dimensional displacement fields in shear crack growth using phase-shifted speckle interferometry

David W. Watt, Ronald U. Goulet, Todd S. Gross

Author Affiliations +

Proceedings Volume 2545, Interferometry VII: Applications; (1995) https://doi.org/10.1117/12.212637
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A three illumination beam, phase-shifted interferometry system is used to measure 3D surface deformation fields to study the mechanics of cracks loaded in shear. The interferometer, which is mounted to the actuator of a servohydraulic loading machine, is augmented with a piezoelectric phase shifter to obtain a sequance of differential phase maps over small load increments. This avoids problems with speckle decorrelation and provides more detailed information about the phenomena of interest. The displacement fields were accumulated relative to the unloaded state by sampling at appropriate locations in the incremental fields to optimize spatial resolution and compensate for large rigid body motions. Features of the effect of fracture surface interference on a shear-loaded crack inferred from the displacement fields are described.

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David W. Watt, Ronald U. Goulet, and Todd S. Gross "In-situ measurements of three-dimensional displacement fields in shear crack growth using phase-shifted speckle interferometry", Proc. SPIE 2545, Interferometry VII: Applications, (23 June 1995); https://doi.org/10.1117/12.212637

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