Civil Engineering Reference
In-Depth Information
3.2.3.6 Groove Material
Normally sheaves and their grooves are made of steel or cast iron. In some cases the
steel grooves are hardened. This hardening does not reduce the endurance of the wire
rope at all, on the contrary it is increased, Bechtloff and Szelagowski ( 1967 ) and
Eilers and Schwarz ( 1974 ). The reason is to be found in the constant form of the
groove without change by wear. It is to be recommended that grooves are hardened.
Fig. 3.50 Breaking number
of bending cycles for cross
lay ropes in sheave grooves
out of polyamide and cast
iron, Müller ( 1961 ).
d = 16 mm;
R 0 = 1,570 N/mm 2 ;
D = 300 mm; r = 053d
4
40kN
3
2 30
2
7
0
10 6
6
4
2
tensile force S
10 5
6
4
20kN
2
30
10 4
40
6
4
2
10 3
10 6
6
4
2
10 5
20kN
6
30
4
40
2
6 strand
8 strand
10 4
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