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Torsion Test
The torsion test evaluates a DUTs structural durability when twisted or subjected to torsional forces. It simulates real-life scenarios like being twisted in a tight pocket or handled unevenly. Here’s a standard procedure and associated standards for conducting this test:
Torsion Test Objective
To determine the mechanical strength and structural integrity of a product when subjected to torsional stress.
| Parameter | Typical Value |
|---|---|
| Angle of twist | ±1.5° to ±5° (per cycle) |
| Torque applied | ~2–5 Nm (varies by model) |
| Duration | 1,000 – 2,000 cycles or 60s hold |
| Speed | 1 cycle/sec (if cyclic) |
| Temperature | Room temp (or varied for stress) |
Test Steps
| Secure Device | Place the device in the torsion jig. |
| Apply Torsion | Twist the rotating clamp to the specified angle (e.g., ±3°). |
| Cycle or Hold |
For cyclic test: Repeat the twist-unwind process for a defined number of cycles (e.g., 1,000 cycles). For static test: Hold at maximum torque for a set time (e.g., 60 seconds). |
| Reverse and Repeat | Repeat the test in the opposite direction if bidirectional testing is needed. |
| Observe Failures |
Inspect for the following after the test: – Screen cracks – Body deformation – Internal damage – Touch/display malfunction |
| Functional Check | Power on and test all phone features (display, camera, buttons, etc.). |
Acceptance Criteria (Example)
- No visible cracks or deformation
- No delamination of screen or housing
- No malfunction in display or touch
- Device fully functional post-test
Standards Followed:
- IEC 60068 Series
- JEDEC Standards
- Apple, Samsung, and OEM internal specs
- Mechanical stress testing
- Bend test series (often includes torsion)
- ASTM Standards (adapted)
These companies have proprietary test procedures that often include torsion tests as part of:
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