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前言英国国家标准1113中明确规定了关于高温条件下运行会发生蠕变的管道和管状部件的设计标准。该标准假定管道或管子是在已知的恒压恒温下运行,而且部件的蠕变寿命与由平均直径周向应力σ_(mdh)所决定的单轴断裂应力(即持久强度)有关。σ_(mdh)由下式表示。
Preface British National Standard 1113 specifies the design criteria for pipes and tubular components that creep at high temperatures. The standard assumes that the pipe or tube is operated at a known constant temperature and constant temperature and that the creep life of the part is related to the uniaxial rupture stress (ie, the persistence strength) determined by the mean diameter circumferential stress, σ_ (mdh). σ_ (mdh) is expressed by the following equation.