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Maximum allowable stress for 7050-T7651?
A 2.500 inch thick 7050-T7651 Aluiminum alloy is being evaluated for use as a pressure vessel. Analysis has determined that the max flaw size present in this material is 0.10 inches. What is the maximum stress that this material can withstand before a flaw would grow? Do not apply a factor of safety to calculation and use a worst case scenario.
Does anyone know how to do this or the formula for max allowable stress of a pressure vessel.
2 Answers
- Scott HLv 61 decade agoFavourite answer
I think that you are either mixing your questions or asking two separate questions. The first appears to be a fracture mechanics question and, I think, what you want to know is what is the fracture toughness of the material. The flaw size, shape, type, and the fracture toughness of the material will determine at what stress the crack will propagate. The second question is what is the yield or ultimate strength of 7050-T7651 for use as an allowable for designing pressure vessels. Aerospace pressure vessels are generally designed as leak before burst based on a maximum design pressure (MDP), and a burst factor (a factor of safety) of some value no less than 1.5.
The material properties can be found in MIL-HDBK-5J or MMPDS (this document supersedes MIL-HDBK-5J) but I don't think that either is available on the web. I would suggest checking MatWeb for some freely available values.