Where to purchase laboratory samples?

[mfig]

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

 

[berkeman]

Paging @jrmichler @Baluncore @Ranger Mike

 

[Baluncore]

For calibration; https://www.sigmaaldrich.com/AU/en/product/sial/ermfa013
Otherwise, for training operators, they should make their own specimens.
https://www.indiamart.com/anand-testing/charpy-v-notch-reference-test-pieces-iso148.html

 

[jrmichler]

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.