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Subcritical Crack Growth in Soda‐Lime Glass under Combined Modes I and III Loading
Author(s) -
Yoda Mitsuo
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05284.x
Subject(s) - crack growth resistance curve , stress intensity factor , materials science , superposition principle , crack closure , fracture mechanics , composite material , crack tip opening displacement , tension (geology) , fracture (geology) , soda lime glass , mechanics , structural engineering , mathematics , ultimate tensile strength , physics , mathematical analysis , engineering
Fracture and subcritical crack‐growth characteristics under combined Modes I and III loading were studied using the modified compact tension (CT) specimens of soda‐lime glass. The combined mode load was applied to the specimen in the direction β with respect to the initial crack. By superposition of Mode III, the advancing crack begins to rotate at an angle Ψ to the initial crack plane, which nearly maximizes the Mode I stress intensity factor K I (Ψ), and the crack continues to propagate in the same direction. In this case, unlike combined Modes I and II, the crack breaks into multiple partial fronts, and ligamentary bridging forms fracture lances when these segmented cracks are held together. The crack velocity d a /d t was plotted versus the maximum Mode I stress intensity factor K I (Ψ) for combined Modes I and III loading. The d a /d t values are initially high, and the crack growth tends to be discontinuous compared with the result for pure Mode I. The subcritical crack growth seems to occur when the K I value for the initial crack reaches a certain value. The d a /d t ‐ K I (Ψ) curves for combined Modes I and III lie roughly on the same curve as that for pure Mode I as the crack growth increases.