Effect of Fatigue on Fracture Toughness of Concrete

Self-similarity and fractals in the Paris range of fatigue crack growth

“…The effective crack length (corresponding to the traction-free length) in the fatigued concrete specimens was estimated indirectly from compliance methods (e.g. see Perdikaris et al, 1986).…”

A thermodynamic correlation between damage and fracture as applied to concrete fatigue

“…In order to validate the proposed model, the number of cycles to failure are computed and compared with the experimental results as shown in Table 3. Along with the experimental results of Bažant and Xu [15] and Shah [16] for non-zero R, further validation is done using other experimental results reported in the literature ( [20][21][22]). Toumi et al [20] conducted tests on notched beams with dimensions 320 mm (Span) Â 50 mm (Width) Â 80 mm (Depth) and a notch length equal to 40 mm.…”

“…Baluch et al [21] tested notched concrete beams of size 1360 mm (Span) Â 51 mm (Width) Â 152 mm (Depth) and an initial notch depth equal to 75 mm. The maximum load P max was equal to 300 N. Perdikaris et al [22] performed tests under four point bending on single edge notched beam specimens of dimensions 960 mm (Span) Â 80 mm (Width) Â 160 mm (Depth). The notch to depth ratio was maintained at 0.2 and maximum load amplitude of 2.7 kN was used.…”

Effect of crack-microcracks interaction on energy release rates

“…The part of the crack layer, which surrounds the current crack tip, is called the active zone of CL. Evolution of the active zone can be decomposed into the following elementary movements: translation, rotation and deformation [1][2][3][4][5]. The driving forces corresponding to these elementary movements have been identified and expressed as linear functions of the energy release rates [6,7].…”