9.2 Test Program
275
Table 9.3 Material properties of steel fiber
Fiber type
Length
(mm)
Diameter
(mm)
Aspect
ratio
Density
(g/cm 3 )
Tensile
strength
(MPa)
Elastic
modulus
(GPa)
Micro-straight
13
0.2
65
7.8
2800
210
9.2.2 Drop-Hammer Impact Test
As shown in Fig. 9.2a, the lateral impact test was conducted by a drop-hammer
impact system, which consists of the drop hammer, fix-sliding support and axial
forcing system. The mass of drop hammer was 850 kg, which was composed of
three weight blocks (3 × 250 kg) and a wedge-shape indenter (100 kg). The impact
interface between the hammer and specimens was a flat subface with the dimension
of 80 mm × 300 mm. Additionally, the indenter-nose was geometrically aligned at
the middle span center of specimens through targeting laser. The maximum releasing
height of the experimental system was 5 m, and the drop hammer was released freely
Fig. 9.2 Test setup a photograph b schematic view (unit mm)
275
Table 9.3 Material properties of steel fiber
Fiber type
Length
(mm)
Diameter
(mm)
Aspect
ratio
Density
(g/cm 3 )
Tensile
strength
(MPa)
Elastic
modulus
(GPa)
Micro-straight
13
0.2
65
7.8
2800
210
9.2.2 Drop-Hammer Impact Test
As shown in Fig. 9.2a, the lateral impact test was conducted by a drop-hammer
impact system, which consists of the drop hammer, fix-sliding support and axial
forcing system. The mass of drop hammer was 850 kg, which was composed of
three weight blocks (3 × 250 kg) and a wedge-shape indenter (100 kg). The impact
interface between the hammer and specimens was a flat subface with the dimension
of 80 mm × 300 mm. Additionally, the indenter-nose was geometrically aligned at
the middle span center of specimens through targeting laser. The maximum releasing
height of the experimental system was 5 m, and the drop hammer was released freely
Fig. 9.2 Test setup a photograph b schematic view (unit mm)