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Bending fatigue tests were carried out on cruciform welded joints of China-made platform steel E36-Z35 with plate thicknesses of 16mm, 32mm and 40mm. The tests consisted of testing in air and in sea water with and without cathodic protection (-850mV. SCE). The sea water corrosion fatigue tests were conducted at loading frequency of 0.2 Hz and sea water temperature of 20℃. The test results show an obvious reduction in fatigue strength of welded joints with increasing plate thickness in all the three test conditions. The present paper proposes different thickness corrections for fatigue strength and fatigue life of welded joints in air and in sea water with and without cathodic protection respectively. In addition, an explanation for thickness effect on fatigue life of welded joints is given by using the theory of fracture mechanics.
Bending fatigue tests were carried out on cruciform welded joints of China-made platform steel E36-Z35 with plate thicknesses of 16mm, 32mm and 40mm. The tests consisted of testing in air and in sea water with and without cathodic protection (-850mV. SCE The sea water corrosion fatigue tests were conducted at loading frequency of 0.2 Hz and sea water temperature at 20 ° C. The test results show an obvious reduction in fatigue strength of welded joints with increasing plate thickness in all the three test conditions. The present In addition, an explanation for thickness effect on fatigue life of welded joints is given by using the theory of fracture mechanics. .