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R.S. Seth and D.H. Page. Fracture resistance – a criterion for paper runnability?. In The Fundamental Properties of Paper Related to its Uses, Trans. of the Vth Fund. Res. Symp. Cambridge, 1973, (F. Bolam, ed.), pp 299–301, FRC, Manchester, 2018.


For a body containing a crack, the Griffith energy balance criterion for crack growth is –

G = – (∂U/∂A)

where G is the strain energy release rate for a fixed length l of the specimen, U is the elastic energy stored in the body and A is the area of the fractured surface.

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