Measurement of Crack Tip Displacement Fields in Mixed Mode I–Mode III Fracture |
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Authors: | David A Tossel Kenneth H G Ashbee |
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Affiliation: | H. H. Wills Physics Laboratory, Bristol BS8 1TL, England |
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Abstract: | A new method has been devised to propagate stable subcritical mixed mode I–mode III cracks in soda–lime–silicate and borosilicate glasses. The mode I content was measured using an original optical tunneling technique and mode III content via multiple-beam interferometry. Measurement of the mode III displacement field allows values of mode III fracture toughness, KIII, to be derived. KIII vs crack velocity (v) diagrams have been constructed for both glasses, and, in the case of the soda–lime–silicate glass, v vs KIII relationships have been determined for a variety of humidities. Comparison has been made with published KI vs v data for this glass. |
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