Bending over Sheaves with fluctuating tension load
Deep drum winders mining applications and specific crane applications include bending over sheaves combined with tension fluctuations. By specific mechanisms and controlling system M.R.E. may provide the ability to test wire ropes under bending over sheaves with tension fluctuations at specific timing.
This also applies for applications where slack conditions are prevail as in grab cranes.
An example of a loading cycle which includes:
reverse bending and tension - tension loading at specific timing
This specific fatigue test machine was designed in order to conduct bending tests under fluctuating tension which may be controlled under the typical loading cycle of the application. The machine may be applied to ropes up to 70 mm.
This machine was applied to test 40 and 50 mm to simulate the grab and excavator ropes and drum winders installed at deep and shallow sahfts.
The machine is designed to simulate the loading conditions of the rope's back end including lay lenght variaitons.
Measuring rope properties during fatigue testing
During service life and while accumulating fatigue and abrasion damage the mechanical properties and constructional properties of the rope are changing.
The change in rope properties is directly associated with the fatigue damage and the constructional changes.
M.R.E. provides the ability to measure rope properties and constructional changes during fatiguer testing.
Monittoring rope diameter during fatigue testing
Monittoring rope stiffness
Monitoring rope torque factor
Monitoring rope stretcing during cycling
This data is important for the characterization and correlation between fatigue damage and rope properties.
Moreover, test experience shows theat at specific application and rope construction, this change in properties may be correlated to the discard criteria.
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