Experimental Study on Residual Capacity of Non-Magnetic Steel Fuel Tank Platest after Fatigue Damage

Based on the analysis of fatigue accumulation damage, the mechanism of fatigue accumulation damage on the loss of energy of non-magnetic steel plates is revealed. The results show that the fatigue accumulation effect of non-magnetic steel plates does not depend on the appearance of structural macroscopic cracks; it depends on whether irreversible residual deformation occurs within the material. This fatigue accumulation effect causes an increase in the magnetic flux of the non-magnetic steel sheet, and the higher the degree of accumulated damage, the greater the increase in magnetic flux. The ultimate load bearing failure mode of the non-magnetic steel plate after fatigue accumulation damage also shows a strong 'fatigue continuity' damage pattern, that is, from the fatigue crack extension tip, along the interface continues to crack, until complete failure