Binary criterion analysis design method for preventing plastic collapse and excessive plastic deformation

Abstract

The invention discloses a binary criterion analysis design method for preventing plastic collapse and excessive plastic deformation. The design criteria for preventing the structure from plastic failure under the one-time loading condition comprise the strength criterion and the deformation criterion, and the design load should be smaller than the maximum bearing capacity of the structure dividedby the safety coefficient, so that it is guaranteed that the structure cannot be damaged during operation; And meanwhile, the maximum deformation (or strain) of the structure is limited, so that excessive deformation is avoided under the action of designed load. The invention is provided based on the advantages of the integrated ASME VIII-2 and EN 13445 standards, zero curvature loads and reference material allowable stresses. And the load resistance coefficient design method is used for evaluating the elastic-plastic stress analysis double criteria, so that the method is more convenient and simpler.

Description

Technical field [0001] The invention relates to the field of analysis and design methods for pressure vessels, in particular to a binary criterion analysis method for comprehensively preventing plastic collapse and overall plastic deformation in elastoplastic analysis. Background technique [0002] Failure under one-time loading is the main failure mode of pressure vessels. In view of this failure mode, there are currently two assessment methods: one is the ASME code's structural bearing capacity (that is, the maximum load that the structure can bear), which is called preventing plastic collapse; the other is the EN standard plastic deformation (when elastic deformation When it is much smaller than the plastic deformation, the total deformation can be used for evaluation, which is called the overall plastic deformation (GPD) design check. [0003] The overall criterion for preventing collapse in the ASME code is a strength criterion, which cannot prevent excessive plastic deformat...

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Problems solved by technology

[0005] For the elastoplastic analysis of pressure vessels under one loading condition, the current ASME VIII-2 code and EN13445 standard respectively give the design criteria for preventing plastic collapse and preventing overall plastic deformation, but there are still limitations. For material yield-strength comparison The evaluation results of limit load analysis and elastic-plastic analysis may be quite different in the case of low and significant geometric strengthening effects. Therefore, a new analysis (evaluation) criterion is invented, which can give a more reasonable compromise and provide users with a A general evaluation criterion using elastoplastic analysis

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