Where to purchase laboratory samples?

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When seeking reliable sources for laboratory samples for mechanical testing, particularly Charpy impact test samples and standard tensile test samples, several recommendations emerge. Calibration can be sourced from Sigma-Aldrich, while training operators may require creating custom specimens. For low-cost tensile test specimens, using lengths of threaded rod with a turned-down section is suggested, and for Charpy specimens, lengths of flat stock can be notched with a hacksaw. The discussion emphasizes the importance of low surface stress machining in the necked region of tensile specimens, advising close oversight during the machining process, especially if done by machinists lacking expertise in material testing. Personal experience highlights that better tensile specimens can be produced with careful attention to machining techniques.
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Hello,

I am looking to purchase laboratory samples for mechanical testing. For example, Charpy impact test samples and standard tensile test samples. Does anyone have a recommendation for a reliable source?

Thanks
 
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You need to make your own. If you only need low cost tensile test specimens to train operators, you can use lengths of threaded rod with a turned down section in the middle. Similarly, low cost Charpy specimens can be lengths of flat stock notched with a hack saw.

Getting good tensile specimens for material testing can be a challenge because few machinists understand the need for low surface stress machining of the necked region. If the specimens are made by a machinist that does not have a solid background in material testing, it's a very good idea to personally observe the machining process. If the specimens are made on a CNC lathe, discuss low surface stress, depth of cut, feed rate, and sharpness of tool with the machinist.

I once made some money as an undergrad when I showed that I could make better tensile specimens than the ME department machinist. On a manual lathe.
 
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