Abstract
In the tension test of wire-rope, wire-ropes can not be usually inserted between grips, but fusible alloy is used to cover each wire of the wire-rope, so that the rope may break at its middle portion. Such fusible alloys as Pb-Sb-alloys, Wodd's alloy and Pb- Sb-Zn-alloy are usually used.
The most important properties of the alloys are: (1) low melting point (2) high bond strength between the wire-rope and alloy and (3) small amount of creep. When creep is not small, there occures plastic deformation of anchor portion of suspension bridges in which wire-ropes are connected with anchor bolts by fusible alloy.
Therefore, the writers analyse experimentally the physical properties, i. e. melting point, bond strength and creep. of Pb-Sb-alloy and Pb-Sn-alloy.
Bond strength is measured by steel bar (diameter=15.9mm) instead of wire-ropes. Relation between bond strength and mixing ratio of Pb to Sb or Pb to Sn, relation between bond strength and embedded length, and relation between bond strength and surface conditions of steel bar are tested.
As for amount of creep of alloys used in this experiment, creep test is not done, so it is obliged to estimate only by stress-strain curve obtained in compression, but this estimation is considered to be correct according to the analysis by one of the writers in near future, creep test will be performed by the writers and the above estimation will be checked.
