Abstract
Pulsed-laser light was used to generate internal flaws in fused quartz. The size of the flaw produced was proportional to the amount of laser pulse energy above a threshold value of 2.5 mJ. Specimens of different flaw sizes were tested at room temperature under four-point bending. The bending strength decreased as the flaw size increased, and a Griffith relationship was established between the lateral flaw size and the critical stress at the flaw tip. Characteristic demarcation lines were observed on the fracture surfaces of specimens with a flaw size greater than 0.25 mm. It is suggested that the formation of the demarcation line is caused by a discontinuous change of stress intensity in the dynamic process of the crack propagation.
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Li, Y.Z., Harmer, M.P. & Chou, Y.T. Fracture behavior of fused quartz with laser-induced internal flaws. Journal of Materials Research 9, 1780–1788 (1994). https://doi.org/10.1557/JMR.1994.1780
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DOI: https://doi.org/10.1557/JMR.1994.1780