# Thread: Izod to Charpy impact strength unit conversion

1. ## Izod to Charpy impact strength unit conversion

Hi,
I have Izod impact strength unit value (in J/m) of one material and Charpy impact strength value(in KJ/m2) of another one.
Also this is the most important property behind the material selection.
So can someone suggest me how to compare between those two units?

Thanks,
Navy

2. Originally Posted by navneet.dhote
J/m and KJ/m2.
So can someone suggest me how to compare between those two units?
Someday, hopefully in the not too distant future, some whizzz will invent basic Maths and Algebra.

Let's see, you have Joules and Meters and thousands of Joules and square Meters. Yup, a real toughy that one. Are you that lazy?

3. How to Convert Izod to Charpy
Izod and Charpy are impact strength measurement tests that produce a value that represents the amount of force an individual material can withstand. Both tests are widely used and accepted in product literature. If you need to convert an Izod value to a Charpy value, you can do so with a standard conversion formula.
Difficulty: Moderately Easy
2.Multiply the Izod value by 2.738223.
3 Record your new value. This is the Charpy value obtained by multiplying Izod by the Charpy constant.

4. There is no direct conversion from Izod to Charpy. The only thing we can say is that the Izods are normally a good bit higher than Charpy

They are different process, so you can't convert as the equation answer would not be correct it would just be a number not a true reading.

5. ## On Avg maybe?

Originally Posted by JimerC
There is no direct conversion from Izod to Charpy. The only thing we can say is that the Izods are normally a good bit higher than Charpy

They are different process, so you can't convert as the equation answer would not be correct it would just be a number not a true reading.
Would you say on average its double, 1.5x, or anything like that? I've watched videos on the different in how the sample is tested and it totally makes sense that would one value charpy would always be lower than izod on the same sample type if both methods were used.

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