Figure 1: Cracks under indentation (a) of median type or half-penny crack (type M) and (b) type
FIGURE 1
Figure 1: Cracks under indentation (a) of median type or half-penny crack (type M) and (b) type
Figure2: Schematic view of the indented surface (top view) and the cross section (section view) of Vickers indentation cracking system.
Figure 3: Samples of SCC and NVC for Instrumented Indentation Tests
Figure 4: instrumented indentation test set-up: (a) General view of the macro indenter Zwick and
(b).zoom on the two cells of observation and indentation.
Figure 5: a) Schematic illustration of an instrumented indentation test on of the specimen face), b) The
dimensions associated to the crack length and diagonal indent measurements and c) The C3/2 = f (P)
and a.l1/2 = f(P) graphs with their respective slopes, used to calculate the corresponding fracture
toughness values kIC in both modes (M and P) and this for the material studied by Pertuz et al.[30]:
Sintered tungsten carbide WC - WTi.
Figure 6: Photographs of the SCC4 specimen: a) Indentation test sample, b) Enlarged view of the zone to be indented prior to the test and c) Enlarged view of the area indented after the test: cracking on the surface of the SCC4 matrix after loading at 800N.
Figure 7: Load–displacement curves obtained for SCC4 mix (w/c = 0.43, w/b = 0.35) under 800 N loading.
Figure 8: Crack length of the indent as a function of the indentation load obtained for SCC4 (w/b = 0.35).
Figure 9: Variation in fracture toughness KIC versus water-to-binder ratio (w / b).
Figure 10: Fracture toughness versus w/c ratio for different types of concrete.
Figure 11: Variation in fracture toughness KIC versus compressive strength (fc28).
Figure 12: Fracture parameter (KIC) comparison between SCC and NVC with similar compressive strength.
Tables at a glance
Figures at a glance