Maximum shear stress theory of failure

The underlying basis of Division 2 is similar to that of Section III, but simplified rules are provided for calculating the thickness of commonly used shapes. Designers may be surprised to find that under certain conditions the thickness of ellipsoidal heads will need to be greater under Division 2 than under Division 1. Simplified formulas for torispherical head design are not included because difficulties have been encountered in developing a formula based on the maximum-shear-stress theory of failure and more time is needed. 

In many situations, the yield strength is used to identify the allowable stress to which a material can be subjected. For components that have to withstand high pressures, such as those used in pressurized water reactors (PWRs), this criterion is not adequate. To cover these situations, the maximum shear stress theory of failure has been incorporated into the ASME (The American Society of Mechanical Engineers) Boiler and Pressure Vessel Code, Section m. Rules for Construction of Nuclear Pressure Vessels. The maximum shear stress theory of failure was originally proposed for use in the U S. Naval Reactor Program for PWRs. It will not be discussed in this text. 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

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