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I read that there is a length (the Griffith critical crack length) beyond which cracks start to become self-propagating. If a crack in a sponge very quickly reaches a hole and stops propagating how do then spongy or porous substances crack or tear?

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  • $\begingroup$ There are a lot of different spongy and/ or porous materials. IMO, you might need to be more specific. Best of luck with it anyway $\endgroup$
    – user108787
    Commented Oct 18, 2016 at 20:10

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