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Question:

how can we solve the problem of sliding of an aluminum specimen through drill chucks during tensile testing it?

We faced with a problem while designing a tensile test set-up, which is our graduation project in UniversityThe problem is that we manufactured the test setup and we used two drill chucks (mandrels) for holding the test specimen, which is aluminumHowever, when the system is started, the test specimen slides through the mandrels and we cannot finish the testHow can we solve this problem? IT IS REALLY URGENT!!!

Answer:

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Edit Clamping the specimen is a common problem in tensile testing and so the usual sample is much wider at the two clamping surfaces than in the cross section being measuredThat is the classic dumbbell shapeSince you are using a drill chuck -type clamp, you may need to reduce or farther reduce the diameter of the round specimen in the middle by turning it down on a latheThe flat surfaces three-jaw chuck will be making a line contact with the round specimen and so there is minimum area for holding frictionYou can mill slight flats at 60 deg orientation on each end to enhance clampingRegardless of the clamping technique, the middle will still need to be turned down so that it will be the weakest cross section of the test specimen.
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