Abstract
where U is the total deformation work of a specimen up to fracture and A is the area of fractured cross-section of the specimen [1-3]. Despite the seeming simplicity of determination of 7F, this characteristic has not found wide application in the practice of materials investigations. This is mainly due to the non-invariance of the experimentally determined values of 7F with respect to the geometrical dimensions of the specimen. In particular, it has been ascertained that the 7F-values decrease with increasing relative notch depth in bend specimens [2]. The non-invariance of the gv-values can be due to two reasons: first, the scale effects within the limits of the linear fracture mechanics and, secondly, non-linear irreversible processes, the contribution of which to the work of deformation of the specimen with a crack is scale-dependent [4-6]. The aim of the present study was an attempt to clarify the conditions for determining 7 as an invariant energy characteristic of fracture of linear elastic materials that do not manifest the rising R-curve behaviour using side edge notched beam (SENB) specimens. The deformation work of an SENB specimen with a crack of length a0 can be expressed as the sum [7] p2 k~ (1 v2)Bao u (2 ) 2k0 E
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