Roller Shear

The roller shear is used to determine the resistance to compression fatigue.  The roller shear fatigues the sample dynamically with constant force both laterally and vertically.
The test is run as listed below:
Adjust the roller to obtain a constant force of 130 ± 2 on the foam specimen. This critical measurement may be made by fashioning a lightweight fabric sling around the roller at its center and measuring the force downward while holding the weighing scale vertically over the roller and maintaining the roller axis in a horizontal plane with the pivot axis.
Set the vertical adjustment of the roller or the mounting base by placing the specimen in position and lowering the roller so it is supported by the specimen. Observe the pivot axis and roller axis relationship and adjust the vertical height so that the axes lie in an essentially horizontal plane at the start of the test.
Mount the test specimen on the base platen with the long dimension parallel to the stroke of the dynamic fatigue machine and secure by means of the tape and metal-retainer strips. When mounting cored pieces, coring is to be against the platen. Set the counter to zero, start the machine, and fatigue test the sample for either 8000 cycles (Procedure A) or 20 000 cycles (Procedure B) or another number of cycles specified by the customer.

Available for Rent

This item is available for rent. For more information, please contact Chad Weavers by calling 616-846-6530.


[email protected]

Rental Terms

  • Minimum rental period is 1 month. After the first month, rentals can be prorated in 1/4 month intervals.
  • Schap Specialty Machine, Inc. handles maintenance issues during the rental period(s).
  • For the first 3 months, 100% of the rental payment for each unit is applied toward purchase of that unit.
  • After 3 months, 20% of the rental payment for each unit is applied toward purchase of that unit.
  • The minimum purchase price of each unit is 50% of its original value.
  • Schap Specialty Machine, Inc. will review the condition of the rental equipment upon return, and any repairs that exceed normal wear and tear will be charged to the renter.

More Information








ASTM D1564 


ASTM D3574 

Schap Laboratory Services

Let Schap Laboratory Services run this test for you. Schap Lab is an independent, third-party test lab accredited to ISO/IEC 17025 by A2LA*. We are built on over 50 years worth of executing test programs, and building test machines. We offer a wide range of capabilities to test materials such as leather, fabric, foam, rubber, plastic, and adhesives. We also offer mechanical, durability and life cycle testing of subcomponents, full assemblies and mechanical systems.

For more information, please contact Erik Johnson by calling 616.844.8259 or send an email to [email protected].

* Not every test offered by Schap Lab is covered by our A2LA accreditation. Please consult our Scope of Accreditation ( Certificate #3611.01 ) for a list of accredited services.