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This document discusses the phenomenon of "pop-in" observed in fracture experiments. In intermediate thickness specimens, a small crack may suddenly advance a small amount ("thumbnail size") with an audible click, then stop propagating. This pop-in behavior requires explanation within the framework of energy release rate (G) and material resistance (R). The document explores possible reasons for pop-in, such as G being a non-linear function of crack length rather than linear.

Author

Abhishek Arora

Language

EN