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Castings-Critically stressed areas?
2

Castings-Critically stressed areas?

Castings-Critically stressed areas?

(OP)
What does it mean when a casting has a critically stressed area?

RE: Castings-Critically stressed areas?

My interpretation of this statement is a location of stress concentration in the casting that could result in either local permanent deformation or fracture.

RE: Castings-Critically stressed areas?

(OP)
If I am machining a part made from a casting and the drawing indicates a critically stressed area then I might observe caution?  Is the critically stressed area do to un-equal cooling rates?

RE: Castings-Critically stressed areas?

Does the fabrication drawing have specific requirements listed under notes or some other reference regarding surface finish or contour for this critically stressed area? I would use caution, and find out exactly what the requirements are for this location.

My sense is that you might be fabricating this part from an out-dated drawing? If so, you might be forced to interpret this statement on your own. I don't believe that it relates to un-equal cooling rates from the casting process.

RE: Castings-Critically stressed areas?

See for example MIL-STD-1265 which is avaiable at http://assist.daps.dla.mil/quicksearch/ . There casting are divided to classes and grades where some of them for critical applications

RE: Castings-Critically stressed areas?

One other thought that I had was that the critically stressed area of the casting may have been specified, by the designer, for local volumetric (RT) and surface nondestructive testing.

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