Bogdan Chivulescu
Mechanical
- Feb 7, 2018
- 3
Hello,
I understand that without a well defined "Failure Theory", a piping stress in a piping component is a useless number. I know that there are several Failure Theories employed to assess the stress failure in piping systems(Maximum Stress Theory, Maximum Shear Stress Theory, Maximum Strain Theory and Maximum Distortion Energy Theory).
I am a bit unclear about which of these "Failure Theories" is used by each of the Piping Codes B31.1,B31.3, B31.4 and B31.8? Which of Failure Theories is applicable to which of these four Piping Design Codes?
I have read in CASTI Guidebook to ASME B31.3 (by Glyn Woods & Roy Baguley)on page 13 that:"The two failure theories that form the design basis of B31.3 code are the Maximum Principal Stress Theory and The Maximum Shear Stress Failure theory."
On page 14 from the same textbook mentioned above, it is mentioned that B31.3 bases the stress limit for stresses caused by weight & pressure on Maximum Principal Stress Failure theory while Expansion Stresses caused by temperature change are calculated by an equation based on the Maximum Shear Stress Theory of Failure.
Are there any other references that would explain what Failure Theory is used and in what situations is used by each of the B31.1, B31.3 B31.4 and B31.8 codes?
I would appreciate any suggestions and comments on this subject matter.
Best Regards,
Bogdan Chivulescu[/b]
I understand that without a well defined "Failure Theory", a piping stress in a piping component is a useless number. I know that there are several Failure Theories employed to assess the stress failure in piping systems(Maximum Stress Theory, Maximum Shear Stress Theory, Maximum Strain Theory and Maximum Distortion Energy Theory).
I am a bit unclear about which of these "Failure Theories" is used by each of the Piping Codes B31.1,B31.3, B31.4 and B31.8? Which of Failure Theories is applicable to which of these four Piping Design Codes?
I have read in CASTI Guidebook to ASME B31.3 (by Glyn Woods & Roy Baguley)on page 13 that:"The two failure theories that form the design basis of B31.3 code are the Maximum Principal Stress Theory and The Maximum Shear Stress Failure theory."
On page 14 from the same textbook mentioned above, it is mentioned that B31.3 bases the stress limit for stresses caused by weight & pressure on Maximum Principal Stress Failure theory while Expansion Stresses caused by temperature change are calculated by an equation based on the Maximum Shear Stress Theory of Failure.
Are there any other references that would explain what Failure Theory is used and in what situations is used by each of the B31.1, B31.3 B31.4 and B31.8 codes?
I would appreciate any suggestions and comments on this subject matter.
Best Regards,
Bogdan Chivulescu[/b]