Fatigue Testing

The characteristics of flexibility and flex fatigue resistance frequently represent the key reasons that polymers are selected to comprise certain products. Cut-growth resistance represents an added dimension to flex fatigue and is frequently investigated under bending strain or high extension strain circumstances.

Smithers Rapra can work with your development team to understand the material requirements and develop a testing program that will meet your needs.  Several common test methods that are utilized include:

  • Fatigue to failure: Monsanto FTF
  • Mandrel fatigue: Ross Tester
  • High Deflection Fatigue: DeMattia Tester
  • Cut growth resistance testing
  • Compression fatigue: BF Goodrich tester
    • Permanent set resistance
    • Heat build-up
    • Dynamic properties
    • Blow-out time
De-Mattia Flexer

This measures the resistance to cracks or crack growth to BS ISO 132. Test pieces are clamped with one end in a stationary grip and the other end in a reciprocating grip, the degree of bending and the speed can be adjusted to the material requirements. Frequent inspections are made until the first small sign of cracking is detected on each test piece. For determination of crack growth, an artificial cut is made in the test piece to initiate cut growth.

MRPRA Flexer

This measures the fatigue resistance of rubber. Rubber rings are mounted vertically on pulleys which are free to rotate. Each specimen is expanded repeatedly at various strains at 300 cycles per minute to failure.

Sample Preparation

The presence of our extensive sample preparation facilities which include the thickness reduction of rubbers by slitting/buffing and a CNC machine and our on-site moulding function ensure we are able to test a huge variety of materials and product forms. 

Please contact us to discuss your needs, for more information or to request a quote.

 

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