non-homogenous mat'l properties due to metal forming
non-homogenous mat'l properties due to metal forming
(OP)
How does everyone analyze a problem where cold forming has changed the material properties in certain areas.
Example:
Geometry: A simple "L" bracket cold bent from flat steel.
Loads: Turn 45 lke a "V" and pull apart like <- V ->
Properties: ???, The material propties will be different where the forming has taken place, in the notch of the "L"
Results: If I use uniform material property of the material before forming it will effect the deformation. Also if the yield strength is increased it will effect the yield criteria.
Thanks
EngForm78
Example:
Geometry: A simple "L" bracket cold bent from flat steel.
Loads: Turn 45 lke a "V" and pull apart like <- V ->
Properties: ???, The material propties will be different where the forming has taken place, in the notch of the "L"
Results: If I use uniform material property of the material before forming it will effect the deformation. Also if the yield strength is increased it will effect the yield criteria.
Thanks
EngForm78





RE: non-homogenous mat'l properties due to metal forming
the yield strength will go up in relation to the amount of cold work, that is just the way materials behave. To analyze the post yield behavior you will need non-linear material capability. Then you use teh actual stress-strain curve from material that is cold worked to the same extent. That way the software can determine stiffness (modulus) at varying amounts of strain that are in excess of the yield strain.
RE: non-homogenous mat'l properties due to metal forming
harry
RE: non-homogenous mat'l properties due to metal forming
RE: non-homogenous mat'l properties due to metal forming
Although hardness traverses across the formed area might be easier. (Esp if you have no forming limit diagram.)
RE: non-homogenous mat'l properties due to metal forming
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RE: non-homogenous mat'l properties due to metal forming
Regards
MMATguy