Max Allowable Stress Value
Max Allowable Stress Value
(OP)
Hi,
I am trying to find the max. allowable stress value & Tensile Strength Su, for A1011 Gr 50 material for performing stress calculations. I tried finding it in Section II Part D book, but with no success.
Appreciate any help.
Thanks
I am trying to find the max. allowable stress value & Tensile Strength Su, for A1011 Gr 50 material for performing stress calculations. I tried finding it in Section II Part D book, but with no success.
Appreciate any help.
Thanks





RE: Max Allowable Stress Value
To which Boiler or Pressure Vessel Code are you fabricating using this material?
RE: Max Allowable Stress Value
Thanks for the reply.
It is for Specification DOT 400 Series cargo tanks.
A1011 has been listed as authorized for construction of DOT 400 Series cargo tanks.
RE: Max Allowable Stress Value
With that in mind, I would assume that if a code or standard allows the use of a material and doesn't specify an allowable stress or means or source of obtaining one, that it is the engineer's judgment to use an appropriate value.
You might note that the basic safety factor in the current ASME is 3.5, and for A36, tensile strength is 58,000 psi, allowable stress at ambient temperature is 16,600 psi, and 58,000/3.5 = 16,570 psi, and a similar approach might put you in the ballpark with your material. There may be various reasons to rate a material lower than this (low toughness, for example), and some of the other standards are less conservative than this. I would think in a vehicle application, fatigue might be a limiting factor also.