4140 or 4340
4140 or 4340
(OP)
Hi all,
I am mechanical eng and I do not know much about material.I am planning to use 4140 or 4340 as top platen, a square plate with thickness of 1.5". which one would be stronger against large deflection because the platen will be under hydraulic compression on its center by 75000lb?
I am mechanical eng and I do not know much about material.I am planning to use 4140 or 4340 as top platen, a square plate with thickness of 1.5". which one would be stronger against large deflection because the platen will be under hydraulic compression on its center by 75000lb?





RE: 4140 or 4340
4140 and 4340 have the same modulus, they will deflect the same amount under load.
IE: if it's a square plate with 75,000lbs in the exact center, and restrained at the edges, will see the most deflection in the dead center, and the least at the restraints.
Nick
RE: 4140 or 4340
RE: 4140 or 4340
From the information available in this thread how were you able to determine that the stress would exceed yield unless hardened?
RE: 4140 or 4340
RE: 4140 or 4340
Thanks
RE: 4140 or 4340
Neither 4140 or 4340 will let you approach 250 KSI tensile with a hardness of 32 HRC.
rpo
RE: 4140 or 4340
RE: 4140 or 4340
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.