Common problems and precautions for selecting fixtures

Q: What if the sample always slips off the fixture?
A: Increase clamping pressure or replace with serrated/rubber coated fixture surface to increase friction. Pneumatic fixtures can be precisely controlled by adjusting the air pressure.

Q: What if the sample always breaks at the edge of the fixture?
A: This is a typical 'stress concentration' problem. Elastic material can be added to the contact area between the fixture and the sample, or wider jaws can be replaced.

Q: Can metal and plastic be tested using the same set of fixtures?
A: Usually not recommended. The serrated fixtures required for metal may crush or damage softer plastics. It is recommended to replace the fixture surface or the entire fixture set according to the material.

Q: Do small load tests require heavy fixtures?
A: Not recommended. The use of heavy fixtures in low load testing can affect sensor accuracy, and lightweight fixtures should be selected.