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 - 5 Limitations of Hot Spot Stress Approach
5 Limitations of Hot Spot Stress Approach
5.1 Scope of application of hot spot stress approach
5.1.1
The hot spot stress approach given in Ch 9, Sec 1, [2.3.1] is not applicable for simple cruciform joints and simple T-joints when the stress flow in direction I as shown in Figure 22 is considered. For stresses in the direction normal to the weld at hot spot location “c” (direction I) there is no stress flow into the transverse plating as it is represented only by one plane in the shell model. However, it attracts stresses for in-plane direction (direction II) at hot spot location “a”.
In situations where a bracket is fitted behind the transverse plate as shown in Figure 1, acting with stiffness in the direction normal to the transverse plate, stresses flow also into the transverse plate and the hot spot methodology is considered applicable.
5.1.2
The hot spot stress at position ‘c’ for simple cruciform joints and simple T-joints is to be determined by the stress read out procedure given in [3.1] multiplied by a geometrical stress concentration factor of 1.3 and is taken as:
σHS = 1.3 ⋅ 1.12σ
Figure 22 : Illustration of check points in way of a welded attachment under orthogonal applied in plane loads
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