Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 9 Fatigue - Section 5 Finite Element Stress Analysis - 1 General
1 General
1.1 Applicability
1.1.1
This section applies to fatigue assessment by finite element stress analysis. The methods are based on the hot spot stress approach and requirements are given for both welded and non-welded hot spots. The hot spot stress takes into account structural discontinuities due to the structural detail of the welded joint, but not taking into account the notch effect at the weld toe.
1.1.2
The hot spot stress is generally highly dependent on the finite element model used for representation of the structure and the procedure used to calculate the hot spot stress. No other methods than those described in this Section is to be adopted for calculation of FE based hot spot stress.
1.1.3
Two types of hot spots, denoted ‘a’ and ‘b’ are described in Table 1. These are defined according to their location on the plate and their orientation to the weld toe as illustrated in Figure 1.
Table 1 : Types of hot spots
| Type | Description |
|---|---|
| a | Hotspot at the weld toe on plate surface |
| b | Hot spot at the weld toe around the plate edge |
Figure 1 : Types of hot spots
1.1.4
The method for calculation of hot spot stress at weld toe for any welded details is given in [3.1] except for webstiffened cruciform joints. The method for calculation of local stress for non-welded area is given in [3.2].
1.1.5
The method for calculation of hot spot stress at web-stiffened cruciform joints such as hopper knuckle connection, transverse bulkhead lower stool to inner bottom connection and horizontal stringer heel is given in [4].
1.1.6
Attention is to be given to limitations of the hot spot stress methodology for simple connections given in [5].
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