Abstract
Fatigue crack growth tests have been conducted on S355 G10+M structural steel which is widely used in the fabrication of offshore structures. Fracture mechanics tests have been performed on compact tension specimens with the crack tip located in the heat affected zone. All tests were performed at room temperature in air and the obtained results are compared with the literature data available on a range of offshore structural steels and also the recommended BS7910 trends using the 2-stage law and simplified law. The specimen orientation, with respect to the location of the extraction within the welded plate, has also been examined and discussed in this work. Residual stress measurements have been performed prior to testing by using the neutron diffraction technique. Finally, a numerical model has been developed in order to calculate the effective stress intensity factor range in the presence of residual stresses. The results have shown that the residual stresses play a key role in the fatigue life of the welded structures, especially in the near threshold region.
Highlights
With the increase in energy demand, which has resulted in global warming, a challenge for the international community is to reduce greenhouse gas emissions
A combined experimental-numerical study has been performed in this work to examine the influence of welding residual stresses on fatigue crack growth behaviour of S355 structural steel, which is widely used in the fabrication of offshore wind turbine monopile foundations
The experimental results from fatigue crack growth tests in air have shown that the specimen orientation, with respect to the weld geometry, plays a significant role in fatigue crack growth behaviour of the material and for a given value of ΔK the specimens with 0° orientation show on average around twice higher fatigue crack growth rates compared to the specimens with 180° orientation
Summary
With the increase in energy demand, which has resulted in global warming, a challenge for the international community is to reduce greenhouse gas emissions. Heat Affected Zone Base Metal Residual stress Ultimate Tensile Strength Stress Intensity Factor Compact Tension specimen geometry Single Edge Notched specimen in Bending Post-Weld Heat Treatment Electrical Discharge Machining Fatigue Crack Growth Submerged Arc Welding Gas Metal Arc Welding Boundary Condition Finite Element Finite Element Analysis Virtual Crack Closure Technique Time Of Flight Det Norske Veritas steel, which is used in the fabrication of offshore structures, has been examined in air for the HAZ and compared with the data available in the literature In these comparisons different specimen geometries and thicknesses as well as various welding techniques have been considered. Presented in this paper are the results of residual stress measurements from neutron diffraction as well as a numerical approach for evaluation of the effective Stress Intensity Factor (SIF) range using ABAQUS CAE software
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