Sr. Choi et Jp. Gyekenyesi, Slow crack growth analysis of brittle materials with finite thickness subjected to constant stress-rate flexural loading, J MATER SCI, 34(16), 1999, pp. 3875-3882
A two-dimensional, numerical analysis of slow crack growth (SCG) was perfor
med for brittle materials with finite thickness subjected to constant stres
s-rate ("dynamic fatigue") loading in flexure. The numerical solution showe
d that the conventional, simple, one-dimensional analytical solution can be
used with a maximum error of about 5% in determining the SCG parameters of
a brittle material with the conditions of a normalized thickness (a ratio
of specimen thickness to initial crack size) T > 3.3 and of a SCG parameter
n greater than or equal to 10. The change in crack shape from semicircular
to elliptical configurations was significant particularly at both low stre
ss rate and low T, attributed to predominant difference in stress intensity
factor along the crack front. The numerical solution of SCG parameters was
supported within the experimental range by the data obtained from constant
stress-rate flexural testing for soda-lime glass microslides at ambient te
mperature. (C) 1999 Kluwer Academic Publishers.