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Prior to 2007, the ASME VIII Div 2 guidelines for plastic analysis ere si!ilar to those in

 ASME III" #he 2007 ASME III Div 2 plastic analysis procedures are significantly different to

previous versions$ !ost nota%ly, the von Mises yield criterion is specified as the design stress

%asis &as opposed to the #resca criterion used in ASME III', large defor!ation theory !ust

%e used and to Acceptance (riteria are specified in place of the tice elastic slope criterion"

In addition, an optional true stress)strain curve that can %e holly derived fro! standard

 ASME !aterial data is specified in Appendi* +"D" hen using this !odel, the hardening

%ehaviour is included up to the true ulti!ate stress and perfect plasticity %ehaviour assu!ed

%eyond this li!it"

#he to Acceptance (riteria are a -lo%al criterion that re.uires de!onstration that the

design does not e*perience overall structural instability  &plastic collapse' under the

specified design load cases, indicated %y convergence failure in the analysis, and Service

criteria that li!it the potential for unsatisfactory perfor!ance under the alloa%le loads

evaluated according to the glo%al criterion" In addition to designing against glo%al plasticcollapse, a local strain limit failure criterion is defined"

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