Servo-Controlled Endurance Testing Machine

For Rubber Pads and Silent Blocks (Capacity-300kN)

ENKAY Cyclic/Static Rubber pad testing machines are state of the art machines based on Servo Controlled Closed Loop system. All the controls and data acquisition is through the computer. The system has a wave generator, cyclic & static, which forms a base to the compound signal. This signal is sent to PID controller. The machine response signal through base sensors that is displacement/load is also passed on to the PID controller. The difference in two signals actuates the torque motor of the servo valve thereby ensuring that the machine system follows the set path of the wave generator. Dwell time loading –unloading and recording of the reading is controlled through the software supplied as standard along with the system.

The machine is capable of conducting following tests on Elastomeric Pad and Silent Blocks

Elastomeric Pad Testing

  1. Compressive Load Deflection Characteristic Test (As Per Clause 3.4.3 of RDSO Specifications)

    Testing Condition : The system loads the pad from 0-20Tons three times at Strain rate of 10+5 mm/min. and then in the 4th cycle, it records Load versus Deformation Characteristics. Deflection characteristics are recorded and printed at Loads of 10, 15 and 20Tons.

  2. Shear Load Deflection Test (As Per Clause 3.4.4 of RDSO Specifications)

    Testing Condition : Refer to RDSO sketch No.WD2-7561-Ss/1, the system Loads the pad 3 times from 0-12Tonnes with the Strain rate of 10+ 5mm/min. and in the 4th cycle holds the load at 12Tonnes. Then Horizontal Load of 5Tonnes is given at a Strain rate of 10+ 5mm/min. 3 times successively and in the 4th cycle records Load versus Deflection characteristics.

  3. Shear Fatigue Test (As Per Clause 3.4.6 of RDSO Specifications)

    Testing Condition : Sample is fixed at 10 degrees to the horizontal as per Drawing No.WDX-91/7Alt.1 and then loaded from 7-22Tonnes at a frequency of 2Hz for 5,00,000cycles. The system automatically adjusts any permanent deformation and keeps the load within the specified limits of 7-22Tonnes.

Silent Block Testing As Per RDSO Spec. No. RDSO/2007/CG-06

  1. Compression Test : Applying a Load of 15Tons for three successive cycles and record the deformation in the fourth cycle.

  2. Torsion Test : The inner shaft of sample is clamped in the fixture and apply a rotating load on outer body for three successive cycles up to 8° and record the data at every 0.5° in the fourth cycle.

  3. Endurance/Fatigue Test : Apply a load of 5Tons-15Tons at a maximum frequency of 1-2Hz with a maximum deflection of 3mm for 2,50,000 cycles or more.

Silent Block Testing As Per Rdso Spec. No. Rdso/2006/Cg-15

  1. Compression Test : Applying a Load of 8Tons for three successive cycles and record the deformation in the fourth cycle.

  2. Torsion Test : The inner shaft of sample is clamped in the fixture and apply a rotating load on outer body for three successive cycles up to 8° and record the data at every 0.5° in the fourth cycle.

  3. Conical Test : The inner shaft of sample is clamped in the fixture and apply a conical load on outer body for three successive cycles up to 8° and record the data at every 0.5° in the fourth cycle.

Note: - The fixtures to conduct different test on Elastomeric Pad and Silent blocks are not part of the base machine and are quoted separately.

A Typical Test Set Up Comprises Of

  1. Load Frame with side jacks including
    • Hydraulic Actuator (±300kN)
    • Load Cell (±500kN)
    • Displacement Transducer (±100mm/200mm)
  2. Hydraulic Power Pack with Electrical Control Cabinet
  3. Module with servo valve, high pressure filter, gas filled accumulators
  4. Recording System includes
    • Signal Conditioning and Controlling Unit
    • Computer for Controlling and Data acquisition
    • Control and Analysis Software

Optional Attachments At Extra Cost

  1. Attachment for Shear Load Deflection Test :

    It is suitable to conduct tests on the Elastomeric Pad as Clause 3.4.4 of RDSO specification. It consists of a frame with horizontal actuator fitted with one Load cell of 5Ton capacity and one Displacement sensor of + 50mm range. It is a geared motor arrangement having a total travel of 100 mm. The rate of strain is fixed at 10mm/min.

  2. Attachment for Shear Fatigue Test :

    It is suitable to conduct tests on the Elastomeric Pad as Clause 3.4.4 of RDSO specification. It is specifically designed to place the pad in such a way that load is applied at angle of 10º between 7-22Tonnes at a frequency of 2Hz.

  3. Fixture with ‘U’ blocks for Compression and Endurance Test on Silent Block : 1No. and Endurance Test on Silent Block
  4. Clamping Fixture for Torsion Test on Large Silent Block : for Torsion Test on Large Silent Block.
  5. Fixture with ‘U’ blocks for Compression on Small Silent Block : for Compression on Small Silent Block.
  6. Clamping Fixture for Torsion Test on Small Silent Block : for Torsion Test on Small Silent Block.
  7. Clamping Fixture for Conical Test on Small Silent Block : for Conical Test on Small Silent Block.

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