Rotation actuator for Tension- Torsion measurements:
  • Torque reponse against axial load
  • Torsion stiffness measuremnts
 
 

 Torque response as varies with twsit/openning level,
Measurement resolution: 30deg/100d
 
 
Load elongation curve
 
 The rope stiffness is measured after 10 loading cycles.
  
 
Direct measurement of the elongation:
 
Generally we use LVDT device installed along the rope
for  direct elongation measurement, accordingly avoiding the ends effect.  
 
 
 
 
 
 
 
 
LVDT for elongaiton measurment
 

Static measurements

The measurements of the mechanical properties of wire ropes as: stiffness, breaking load torque factor, load torque response are important in order to follow on the rope quality, production quality and the rope performance under specific loading and application.

  
M.R.E. is equipped with a tension torsion machine with a capacity of 2.5 [MN], a span of 5 m' rope sample, a rotation actuator, LVDT devices and a series of load cells with different load range.
 

These facilities and instruments provide the ability to measure the following rope and cable characteristics.

  • Axial stiffness
  • Tension and elongation 
  • Torque factor and its variance with lay length
  • Torsion stiffness
  • Tension rotation response - open end, swivel condition
  • Breaking load as varies with rotation/lay length
  • Breaking load under specific damage: residual strength
  • Static and dynamic strain measurements along individual wires under different loading conditiions

Fatigue and static tests on wire ropes require sterile conditions with regard to the terminations i.e. verification of equal load sharing between strands.

We generally use strain gauges installed along individual wires at different strands in order to verify the validation of the test results and the perfection of the socketing/termination process. Moreover, strain measurements will provide important information with regard to the stress filed along the wires.
 
  
 
 

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