POLYLUBE® IFR Bearings
A bearing with optimized structure for improved resistance in applications with repeated impact fatigue or stress / strain conditions.
The POLYLUBE® IFR bearing offers the same inherent anti-friction components that allow it to achieve the low wear characteristics of the Fiber and MRP series bearings. However, in comparison to these two products, the IFR bearing (Improved Fatigue Resistance) offers a proprietary laminate structure of the bearing backing that increases the bearing's resistance to repeated stress/strain conditions.
A traditional filament wound composite bearing application that kept resulting in failure after just 10,000 oscillatory cycles drove Polygon to develop the IFR bearing. The pressure on the bearing was well under the design threshold with the actual applied pressure to the bearing was 10,000 PSI. 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 what was believed to be the limiting factor: optimization of system's interlaminar shear. POLYLUBE® IFR bearings offers a more than twofold increase in the impact fatigue over traditional composite bearing materials.
Product Schematic
Traditional filament wound composite bearings will tend to show fatigue failure in the form of resin shear failure in the traverse direction to the reinforcing fibers. The logical solution to this problem was to try to cross-tie the reinforcing fibers together with other reinforcing fibers so as to minimize the shear stresses in the resin.
Mechanical & Physical Properties
| Ultimate Compression Strength PSI | 60,000 |
|---|---|
| Unit Load Limit PSI | 30,000 |
| Temperature Range (Standard Formulation)* °F | ±325 |
| Coefficient of Thermal Expansion in/in/°F | 7 x 10-6 |
| Thermal Conductivity BTU * in/(hr * ft2 * °F) | 1.8-2.3 |
| Water Absorption as % weight produced (2 hours) | 0.12 |
| Water Absorption as % weight produced (24 hours) | 0.16 |
| Specific Gravity | 1.87 |
| Maximum Velocity SFM | 10 |
IFR-MRP Mechanical Properties
| Mechanical Properties | Polylube Fiber or MRP Series Bearing |
Polylube IFR Bearing |
|---|---|---|
| Ex (axial) (Msi) | 1.3 | 1.6 |
| Ex (hoop) (Msi) | 3.2 | 2.4 |
| Gxy (Msi) | 1 | 1 |
| Tx (tensile) (Ksi) | 5.5 | 11.9 |
| Tx (Ksi) | 64.5 | 48.7 |
| Cx (compression) (Ksi) | 18.8 | 20 |
| V-xy (Poisson’s Ratio) | 0.314 | 0.312 |
| V-yx | 0.762 | 0.435 |
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Disclaimer
Any ratings are typical for design purposes. 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.
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