Rockwell Hardness 1

[tulum]

Can anyone explain the following:

copper 1/4 Hard
copper 1/2 Hard
copper 4/4 Hard

The above are used in a strain formula I am using. Basically, in the formula you would use a permissible strain of 1200daN/cm^2 for 1/4, 2300 for 1/2, and 3000 for 4/4.

Problem is, the manufacturer has given the hardness of the copper I am using as a hardness of 84 from a rockwell Hardness test?

How do I get the 2 to meet?

 

[MintJulep]

Take a look at

http://www.copper.org

There is some good tech info there, although it is sometimes difficult to find.

 

[unclesyd]

Make sure you have the right hardness scale when Looking up the values.
The following two publications have references to temper designations .

BS EN 1173.

CDA Publication No 120,

 

[boo1]

also see
ASTM B-88 Seamless copper water tube

ASTM B601 Temper Codes for Copper Metal and Copper Alloys
1/8 Hard H00
1/4 Hard H01
1/2 Hard H02
3/4 Hard H03
4/4 Hard H04

 

[tbuelna]

tulum:

You need to know the Rockwell scale that the "84" value is taken from. For copper, it is likely F or G scale. Once you know the scale you can convert to tensile strength.

Try this website:

http://www.gordonengland.co.uk/hardness/hardness_conversion_3c.htm

Good Luck.
Terry