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How To Calculate The Basic Allowable Stress For A Material?

Answer»

The basic allowable stress is DEFINED in RESPECTIVE code. For example as per B 31.3 the basic allowable stress for a material is the minimum of the following:

  1. 1/3rd of tensile strength at design temperature.
  2. 2/3rd of yield strength at design temperature.
  3. 100% of average stress for a creep rate of 0.01% per 1000 hours.
  4. 67% of average stress for rupture at the END of 100000 hours.
  5. 80% of minimum stress for ruptures at the end of 100000 hours.
  6. For austenitic stainless steel or nickel alloys the lower of yield strength and 90% of yield strength at temperature.
  7. For structural grade materials 0.92 TIMES of the lowest value of point (a) to (f)

The basic allowable stress is defined in respective code. For example as per B 31.3 the basic allowable stress for a material is the minimum of the following:


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