How to test the fiber ropes
Currently the strength evaluation of cables has dominated the testing of fiber ropes, but this is surely not enough.
Rope strength is often a key consideration in various application areas, but other tests that measure various properties of a rope or fiber still cannot be ignored.
Cable testing includes, but is not limited to, strength, size and weight, length, elongation, creep, fatigue tension, abrasion, fiber and yarn material properties, and more.
Linear density, as an important physical and geometrical characteristic of fibers, affects the processing and product quality of cables, and therefore requires special attention to ensure suitable application fields and service life.
Rope diameter specifications are usually nominal, with a slight reduction in diameter during the initial stages of use. Certain scenarios require a precise fit with equipment (eg, bundling or passing through parts), and close attention should be paid to the precise dimensions involved, as all ropes will perform slightly differently. In general, the tolerance of linear density is ±5%. Extension is the stretch or extension of a rope that can be recovered immediately after the load on the rope is released, possibly creating hysteresis and permanent extension. Creep refers to the slow deformation of a material when subjected to a load for an extended period of time. Creep is largely irreversible and is one of the mechanisms leading to permanent extension. Strength and fatigue resistance are affected by temperature. The heat generated by the friction between the structures of the cable will cause local high temperature. When the critical temperature is exceeded, the performance of the rope may change. Both construction and fiber type produce different coefficients of friction, which are reflected in the rope's anti-slip properties. The elongation at break is the ratio of the elongation length after stretching to the length before stretching when the fiber is subjected to external force to break, and is an index to characterize the elastic properties.
The characteristics of each fiber are compared as follows:
|Melting point (℃）||218-254||249-260||166||149||499|
|Critical temperature （℃）||163||177||121||65.5||271|
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