1. Non-destructive strength testing of microindented float glass by a nonlinear acoustic method.
- Author
-
Karlsson, S., Kozłowski, M., Grund, L., Andersson, S.A.K., Haller, K.C.E., and Persson, K.
- Subjects
- *
GLASS , *SOUND waves , *NONLINEAR waves , *CONFIDENCE intervals , *OCHRATOXINS , *NONDESTRUCTIVE testing , *PROOF of concept - Abstract
[Display omitted] • Indentation-induced cracking in small specimens renders realistic glass strengths. • Nonlinear acoustic method gives a measure of the amount and size of the defects. • Non-destructive test of the glass strength for small samples (10 × 10 cm2). • Failure stress vs. normalized defect value (NDV) gives a linear correlation. The present paper describes a method for non-destructive testing of the glass strength. Square 10 × 10 cm2 samples of annealed float glass was inflicted with a controlled defect in the centre of the atmospheric side using Vickers microindentation-induced cracking with a force of 2 N, 5 N and 10 N and compared to an un-indented reference. The samples were non-destructively tested using a nonlinear acoustic wave method resulting in defect values. The average of the defect values was found to linearly correlate to the indentation force in a log–log relationship. The samples were subsequently tested in a ring-on-ring setup that allows for an equibiaxial stress state. The indentation-induced cracking gave practically realistic strength values in the range of 45 to 110 MPa. The individual sample values for failure stress as a function of normalized defect value show linear trends with approximately half of the data within 95% confidence limit. In summary, this study provides an initial proof-of-concept for a non-destructive testing of the strength of glass. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF