Wire Ropes Under Bending and Tensile Stresses - Wire Ropes: Tension, Endurance, Reliability - page 214

S

S

D

bending sequence

bending elements
2 x

and 6 x

Fig. 3.30 Sheave arrangement to test reverse bending

3.2.1.2 Rope Bending Fatigue Machines

The inventor—or at least the first manufacturer and first user—of wire ropes was
Albert and he also constructed the first rope-bending fatigue machine. That also
was the first known arrangement for fatigue testing of material on the whole.
Figure 3.31 shows his bending machine from 1828 which he originally used to test
the endurance of fibre ropes and chains. Albert carried out these tests in order to
find out which types had better endurance for use in hoisting apparatus for mines.
Later he carried out such bending tests with a certain degree of success on his self-
produced ropes made of steel wires. In 1834 he installed the first real stranded wire
rope for the hoisting installation in the mining shaft Caroline with a depth of
480 m, Bahke ( 1984 ).

3.5 m

1550 kg

Fig. 3.31 Rope-bending fatigue machine made by Albert in the year 1828, Benoit ( 1935 )