Improved lifespan with repeated impact fatigue
A composite bearing with optimized structure for improved resistance in applications with repeated impact fatigue or stress / strain conditions, the IFR bearing (Improved Fatigue Resistance) offers a proprietary bearing backing that increases resistance to these conditions.
The IFR backing is typically combined with either the MRP or EWS bearing liner to increase service life in applications with high edge loading caused by misalignment. The IFR backed bearing (for Improved Fatigue Resistance) offers a proprietary laminate structure of the bearing backing that increases the bearing’s resistance to repeated stress/strain conditions.
Improved resistance to shock loading is provided by reinforcing fibers in the backing, combined with our MRP liner to produce a versatile composite bearing.
The full 300% wear life improvement of our EWS line combined with the improved shock resistance from reinforced fiber structure in the backing.
Several years ago, Polygon Company was approached with a seemingly straightforward application for traditional filament wound composite bearings. At issue was an application that was resulting in bearing failure due to high misalignment from a cantilevered design. The pressure on the bearing was well under the design threshold (actual applied pressure to the bearing was 10,000 PSI or 69 MPa). In response to this customer’s demand, Polygon Company developed an improved fatigue bearing that in the case of the above application, increased the life of the bearing by over 50%.
Because composite filament wound bearings are not isotropic materials as are metals, Polygon Company’s FEA laminate analysis focused on optimization of the system’s interlaminar shear. The PolyLube® IFR backed bearing offers a more than twofold increase in fatigue life over traditional composite bearing materials.
This picture represents the initial “on-set” condition commonly related to fatigue failure due to repeated impulse loading of the bearing. Composite bearings that do not have an optimized resin system and laminate architecture will be very susceptible to this type of failure.
|Mechanical Properties||MRP Bearing||IFR Backed|
|Axial Tensile Strength (Sx psi)||8,750||9,450|
|Axial Compressive Strength (Sx psi)||24,750||19,750|
|Hoop Tensile Strength (Sy psi)||30,750||20,250|
|Hoop Compressive Strength (Sy psi)||30,800||20,250|
|Radial (wall) Compression Strength (Sz psi)||30,690||30,690|
|Axial Modulus of Elasticity (Ex Msi)||1.82||2.1|
|Hoop Modulus of Elasticity (Ey Msi)||3.71||2.57|
|Radial (wall) Modulus of Elasticity (Ez Msi)||0.97||0.97|
|Torsional Shear Modulus of Elasticity (Gxy Msi)||1.12||1.62|
|Poisson's Ratio (νxy)||0.21||0.36|
|Poisson's Ratio (νyx)||0.42||0.51|
|Poisson's Ratio (νxz)||0.30||0.25|
Any ratings are typical for design purposes. Your design parameters may affect final ratings. Consult with a Polygon sales engineer for guidance. Final testing and approval is the customer's responsibility for their application. This information is derived from our testing and published data. There is no assurance of these properties, or warranty provided that these products are suitable for any particular purpose or operational situation.
Polygon certifies that their product will be free from material defect. Polygon will not accept any liability for loss, damages, or costs from use or misuse of our products.
Specifications are subject to change, and may be affected by our continual process of improvement. Changes may be made without prior announcement.