Fracture and Fatigue Control in Structures: Applications of Fracture Mechanics, Third Edition

Composite repairs to bridge steels demystified

“…7 In the case of cracks that arise and grow from small sub mm material discontinuities. 8 An interview with Professor Mandlebrot where he gives an explanation of fractals and roughness is available on line at: https://www.youtube.com/watch?v=Xm-2ouPGrlY 52]. The fact that this value of the fractal box dimension D (= 1.2) holds for a large crossection of materials is documented in [49,53].…”

Fatigue crack growth analysis of fiber reinforced concrete with effect of interfacial bond degradation

“…Design for high fatigue resistance It is known in many materials [6][7][8] that fatigue crack growth rate becomes negligible when the net crack tip stress intensity factor amplitude, K tip , is below a threshold value, K th , so the above discussion on achieving negligible crack growth rate is equivalent to achieving K tip below K th . As mentioned above, K a increases with the crack length, so does K tip , if K tip is equal to K a without fiber bridging (K b =0).…”

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19] The Paris law gives the relation between the crack growth rate and the crack tip stress intensity factor amplitude, namely…”

Finite-Element Modeling of Twin Steel Box-Girder Bridges for Redundancy Evaluation

“…(Wikipedia, 2009) In 1969, Bryte Bend Bridge near Sacramento, CA was severely damaged due to a brittle fracture that initiated in a connecting joint where lateral braces were welded into the top flange. This bridge utilized a single trapezoidal box-girder that was constructed using A517 steel, which has low notch toughness; thus, it was vulnerable to brittle fracture (Barsom, 1999). The Lafayette Street Bridge in St. Paul, MN was shut down in 1975 because of a large crack in one of its main girders, which led to a large (7-inch) vertical deflection at the location of the crack.…”