Question: The fracture strength of glass may be increased by etching away a thin surface layer. It is believed that the etching may alter surface crack

The fracture strength of glass may be increased by etching away a thin surface layer. It is believed that the etching may alter surface crack geometry (i.e., reduce crack length and increase the tip radius). Compute the ratio of the original and etched crack tip radii for an eight fold increase in fracture strength if two-thirds of the crack length is removed.

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