Issue 38

F. Majid et alii, Frattura ed Integrità Strutturale, 38 (2016) 273-280; DOI: 10.3221/IGF-ESIS.38.37 275 Figure 1 : Illustration of pressure vessels elements. Step Step detail Formulas Exemption Method B Step3- Full range pressure cycles FP N N C S 1 ( )   (1) Step4- Maximum range of pressure a P PN S N P C S 1 ( ) ( )    (2) Step5-Maximum temperature difference between two adjacent points a TN TN ym S N P C C E 1 1 ( ) ( )     (3) Step6-Maximum temperature difference fluctuation between two adjacent points a TN R ym S N P T C C E 1 1 ( ) ( )     (4) Step7-Maximum temperature difference fluctuation for differents components materials a TM R y y S N T C E E 2 1 1 2 2 ( ) ( ) ( . . )       (5) Step8- Equivalent stress range MLR a S S S N ( )    (6) Fatigue Assessment Elastic Stress Analysis Equivalent stress e k p k LT k v k LT k K S S K S S , , , , , ( ) ) 2       (7) Elastic-Plastic Stress AnalysisEquivalent strain ya k eff k E S , , 2    (8) peq k y S E ,        (9) Table 1 : Pressure vessels fatigue design.