Gardner Impact Testing 3

[spike]

My question is in regard to material testing, specifically Gardner Impact testing. I read ASTM D5420 (Gardner Impact) and it says that the results are in units of inch pounds. I have a document from a former vendor that states that the impact test on material furnished to us is in units of in-lb/mil. Can anyone explain this to me.

Thanks

 

[BillPSU]

I had never heard of a Gardner impact testing before this thread. I googled it and this is one of the sites I found and explains how the equipment works. I don't know what kind of comparison numbers you need but this info should help.

http://www.qualitest-inc.com/gardner.htm

 

[TVP]

Spike,

Gardner impact testing measures the energy needed to cause fracture, therefore the units need to be in terms of energy. Joules (J) are the preferred, SI notation for ASTM D 5420, with pound force-inch also being a unit of measure for energy. in-lb/mil is not appropriate.

 

[CoryPad]

I suspect that the source that used in-lb/mil was testing thin sheet/film and was dividing the fracture energy by the sheet thickness in mils (one one-thousandths of an inch).

Regards,

Cory

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