OCJENJIVANJE ZAMORA BRODSKIH KONSTRUKCIJA - FESB

2.5 Projektne S–N krivulje (Wöhlerove krivulje) ............................................................... 42
2.5.1 HSE S–N krivulje .................................................................................................. 43
2.5.2 IIW S–N krivulje ................................................................................................... 44
2.6 Utjecajni parametri zamora ........................................................................................... 45
2.6.1 Utjecaj oblika spektra naprezanja ......................................................................... 46
2.6.2 Utjecaj srednjeg naprezanja .................................................................................. 47
2.6.3 Utjecaj morske okoline (korozija)......................................................................... 48
2.6.4 Ostali utjecajni parametri zamora ......................................................................... 48
2.6.4.1 Utjecaj izrade ..................................................................................................... 48
2.6.4.2 Utjecaj materijala .............................................................................................. 49
2.6.4.3 Utjecaj zaostalih naprezanja .............................................................................. 49
2.6.4.4 Utjecaj debljine ................................................................................................. 49
2.7 Analiza pouzdanosti zamorne čvrstoće ......................................................................... 50
3 POSTUPCI ZA OCJENU ZAMORA ............................................................................... 39
3.1 Općenito ........................................................................................................................ 39
3.2 Postupak proračuna zamora Bureau Veritasa (BV) ...................................................... 41
3.2.1 Općenito ................................................................................................................ 42
3.2.2 Opterećenja brodske konstrukcije ......................................................................... 43
3.2.2.1 OdreĎivanje opterećenja .................................................................................... 43
3.2.2.2 Slučajevi opterećenja ......................................................................................... 45
3.2.3 Dugoročna raspodjela naprezanja ......................................................................... 47
3.2.3.1 OdreĎivanje nazivnog naprezanja ..................................................................... 49
3.2.3.2 OdreĎivanje raspona nazivnog naprezanja ........................................................ 49
3.2.4 Izbor S–N krivulje ................................................................................................. 50
3.2.4.1 Vjerojatnost oštećenja ....................................................................................... 51
3.2.4.2 Utjecaj zaostalih naprezanja .............................................................................. 51
3.2.4.3 Utjecaj tlačnih naprezanja ................................................................................. 51
3.2.4.4 Utjecaj izrade ..................................................................................................... 51
3.2.4.5 Utjecaj materijala .............................................................................................. 52
3.2.4.6 Utjecaj morske okoline – korozija .................................................................... 52
3.2.4.7 Haibach efekt ..................................................................................................... 52
3.2.5 Procjena dinamičke izdrţljivosti ........................................................................... 53
3.2.6 Zamorna pouzdanost ............................................................................................. 53
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