Home Ask The Expert Earl answers your questions.... Hi Earl, How serious an effect does the speed of the test have on resultant tensile data? I'm seeing some variation between results and since I'm using an open loop TO system, speed control seems like its the major variable.

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Hi Earl, How serious an effect does the speed of the test have on resultant tensile data? I'm seeing some variation between results and since I'm using an open loop TO system, speed control seems like its the major variable.

Author:
John Simpson
Date added:
Friday, 14 September 2007
Last revised:
Wednesday, 28 March 2012
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Answer

Hello, I assume you are testing metals? The speed of test may have a big effect depending on what type of material it is. Typically yield is effected with varying speeds. ASTM has specific recommendations for speeds for pre yield and post yield speeds based on the type of material you are testing. If it is an older TO system it may be able to get retrofitted to a new controller. If you are testing plastics in some cases it would make a difference, again ASTM should call out the speed based on what type of material you are testing. Thanks

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