Charpy V Notch Impact Test
Charpy V Notch Impact Test
(OP)
Hi,
I have from API quoted a test requirement of 20J on the transverse direction on a 10mm x 10mm specimen for a V Notch impact test. The material supplier has done the test on the longitudinal direction and has obtained a value of 75J. Is there any means of converting this value to transverse direction. If so can you provide detail of conversion. I am not much into material testing either so possibly i am going to take this oppurtunity to know more about V Notch impact test. Does anyone know the source on the internet to find some material.
Mechotron
I have from API quoted a test requirement of 20J on the transverse direction on a 10mm x 10mm specimen for a V Notch impact test. The material supplier has done the test on the longitudinal direction and has obtained a value of 75J. Is there any means of converting this value to transverse direction. If so can you provide detail of conversion. I am not much into material testing either so possibly i am going to take this oppurtunity to know more about V Notch impact test. Does anyone know the source on the internet to find some material.
Mechotron





RE: Charpy V Notch Impact Test
There is no orientation conversion for CVN impact values. The specific orientation of sample removal and test reporting are essential variables for CVN testing, and this cannot be converted to a standardized value.
You can visit the web site below for decent background information on CVN testing;
ht
RE: Charpy V Notch Impact Test
You can not relate the longitudinal Charpy to transverse easily, usually you will see the transverse is a lot less than the longitudinal. You should feel happy if transverse is higher than .5% of longitudinal. The ratio will depends on the tramp element such as S and non-metallic inclusions. Simply saying the material is isotropic and people hope so though.
The v-notch Charpy standard ASTM E23 requires 10X10X55mm for full scale bar but this is not applicable for small OD tubing often times. So API exempted longitudinal or sub-scales for this case, which I personally do not think it is a good idea, but has prevail.