Estimation of dynamic fatigue strengths in brittle materials under a wide range of stress rates

Exact implementation of subcritical crack growth into a Weibullian strength distribution under constant stress rate conditions

“…(24) and (26) leads to an explicit, analytic (exact) expression of the cumulative strength distribution F taking SCG into account:…”

“…Actually the proposed procedures for the determination of these parameters are based on an approximate approach for the strength distribution, which is valid for experimental conditions where SCG reduces significantly the resulting strength values with respect to a given inert strength. [24][25][26][27] In the following an analytic approach is derived for the evolution of the apparent strength with respect to the inert strength including the effects of SCG. This result will be used to derive analytically the resulting strength distribution in terms of an initially Weibullian inert strength distribution.…”

Slow growth of microcracks in hydroxyapatite during aging

“…Both indirect static/dynamic fatigue tests [16][17][18][19][20][21][22][23][24][25][26] and direct measurements of crack velocity via double torsion tests [27,28] have been used to explore the V-K I behavior of brittle materials. The slow crack growth exponent, n, obtained from either indirect or direct methods, describes a materials' resistance to delayed mechanical fatigue [15].…”