Single edge notched beams were subjected to varying rates of loading, to establish the mode I Stress Intensity Factor, K//I vs. Crack Velocity, V, relationship for mortar and concrete. Impact tests were conducted using a Modified Instrumented Charpy Impact Test System. The rate of crack growth was obtained using brittle 'Krak Gages'. Mode I test results lead to the following conclusions. (1) Slow (prepeak) crack growth for concrete is larger than that of mortar, at a given strain rate. (2) Pre-peak crack growth decreases with increase in strain-rate. This could be the reason for decrease in pre-peak non-linearity at higher strain rates. Hence LEFM approach may be valid at high rates of loading. (3) log K//I - log V relationship is non-linear especially at the higher rates of loading.
|Original language||English (US)|
|Title of host publication||Materials Research Society Symposia Proceedings|
|Publisher||Materials Research Soc|
|Number of pages||17|
|State||Published - Dec 1 1986|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials