1. Function and Application
The 2 Station Sequential Fatigue Tester is a pneumatically driven cyclic load testing machine designed to apply repeated forces on test specimens to evaluate durability and fatigue life.
This PC-controlled tester allows fully programmable load profiles and precise bidirectional load applications.
It is widely used for evaluating the fatigue performance of seats, foams, cushioning materials, and other mechanical components.
2. Applicable Test Standards
ASTM D3574 – Dynamic Fatigue Test by Constant Force Pounding
ISO 3385 – Flexible Cellular Materials – Determination of Fatigue by Constant Load Pounding
SAE J2896 – Automotive Seat Durability Test Procedures
OEM / Custom Test Specifications – Available upon request
3. Technical Specifications
| Item | Specification |
|---|---|
| Load Capacity | Up to 460 lbs (210 kg) in either direction |
| Air Supply | 100 PSI (shop air) |
| Cylinder | 2½″ bore × 10″ stroke tie-rod type with center trunnion mount |
| Vertical Adjustment | Approx. 30″ via manual screw jack |
| Lateral Motion | Approx. 6″ side-to-side (expandable by repositioning stand) |
| Load Cell | 500 lb capacity, fatigue-rated, closed-loop control feedback |
| Bedplate | 1″ thick precision-ground steel surface with ½″–13 tapped holes on 4″ centers |
| Motion Control | Servo-pneumatic directional valve for forward/reverse control |
| Software System | PC-based Visual Basic interface with programmable waveform and sequence setup |
| Cycle Control | Fully programmable sequences with loop repetition |
| Power Supply | 115 V.A.C., single phase |
| Operating Mode | Constant force or constant displacement |
| Control Console | Floor-standing main console with remote local control and troubleshooting functions |
4. Features and Advantages
Comprehensive Load Control: Closed-loop feedback for precise, repeatable results.
Flexible Configuration: Adjustable trunnion, height, and lateral motion for various test setups.
User-Friendly Operation: Windows-based interface; easy setup with minimal training.
High Versatility: Supports compression, tension, and rotary fatigue modes.
Customizable Profiles: Generate and combine multiple waveforms for complex sequences.
Expandable Design: Supports multiple cylinders and stands in one system.
Robust Construction: Heavy-duty steel structure for long-term industrial testing.
Automatic Safety Stop: Stops automatically when preset cycles or limits are reached.
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