Issue << content << Stress Measurements in Glass and Plastics by Optical Hole-Drilling


DOI:

2013. . No. 1(59) - Mar 2013, pp. 62-64

Stress Measurements in Glass and Plastics by Optical Hole-Drilling

M. Laakkonen

Quantitative residual stress depth profile measurements are common for metallic parts but not in glass or plastic. This article describes some experiments by hole-drilling with ESPI in two types of glasses and two thermoplastics.
Stress measurements on laminated and toughened glass specimens produced the expected results: low stresses in the former and significant compressive stresses near the surface in the latter for the as-is condition. Since the bending stresses change little within the comparatively small depth range, measurements under bending should and do show slightly higher tensile stresses within the whole depth range.

References
  1. Schajer G. S., Steinzig M. Full-field Calculation of Hole Drilling Residual Stresses from Electronic Speckle Pattern Interferometry Data. — Experimental Mechanics. 2005. V. 45. No. 6. P. 526–532.
  2. Schajer G. S., Rickert T. J. Incremental Computation Technique for Residual Stress Calculations Using the Integral Method. — Experimental Mechanics. 2011. V. 51. No. 7. P. 1217–1222.
 
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