Spherically seated compression platens are designed to accommodate compression specimens with surfaces that are not completely parallel. During the application of a small pre-load, the spherically seated compression platens self-align up to 4° to the top of the specimen with reference to the machine’s loading axis. For some models, the spherical seat is integral to the compression platen. For others the spherical seat can be added to convert a compression platen to a spherically seated platen.
Compression Platens with Integral Spherical Seat
The hardened surface of these platens ensures no deformation of the platen occurs during testing while the polished finish minimizes friction between the platen and specimen. Platens that have a 100 mm or larger diameter include a locking mechanism to secure the spherical seat into position, ensuring it is parallel with the lower platen. An LVDT deflection sensor may be attached to provide high accuracy strain measurement.
| Specifications | ||
| Platen Diameter | Load Capacity | Catalog Number |
| 50 mm | 10 kN | S5722A |
| 50 mm | 100 kN | S5722B |
| 100 mm | 10 kN | S5724A |
| 100 mm | 100 kN | S5724B |
| 150 mm | 10 kN | S5726A |
| 150 mm | 100 kN | S5726B |
| 200 mm | 10 kN | S5728A |
| 200 mm | 100 kN | S5728B |
High-Force Compression Platens
The Industrial Series spherically seated compression platens offer optimal balance of rigidity and self-alignment, ensuring uniform specimen loading. Compression platen combinations can be configured to comply with ASTM C39, C67, C109, C133, C140, C365, AASHTO T22, and other standards.
| Specifications | ||
| Spherical Seat Diameter | Load Capacity | Catalog Number |
| 79 mm | 1000 kN | W-2005-A |
| 114 mm | 2000 kN | W-2005-B |
| 165 mm | 4500 kN | W-2005-C |
| 228 mm | 4500 kN | W-2005-D |
| 305 mm | 5000 kN | W-2005-F |
Spherical Seatings
An attachment to convert a compression platen to a spherically seated platen.
| Specifications | |||
| Capacity | Lower Fitting | Upper Fitting | Catalog Number |
| 300 kN | 6 x M10 on 100 mm BC | M48 x 2 fRH (Type llf) | 2501-118 |
| Fatigue Rated | |||
| 500 kN Static 250 kN Dynamic |
M48 x 2 fRH (Type llf) | M48 x 2 fRH (Type llf) | 2840-112* |
| * For use with 2840-11x compression platens | |||