| This thesis examines the fatigue behaviour of two corrosion resistant reinforcing steels: MMFX and 316 LN stainless steel. Standard fatigue specimens machined from reinforcing bars were tested to compare the materials without the effect of stress concentrations arising from deformations.; Constant amplitude tests were performed in lab air to determine the basic material properties. Stress-life tests had a fatigue limit of 1150 MPa and 800 MPa stress range for MMFX and stainless steel, respectively. Strain-life results and a Neuber analysis were used to predict fatigue lives of reinforcing bars with a range of stress concentrations reported in the literature.; The periodic overload tests employed a compressive overload of nearly yield magnitude to minimize crack closure. Effective stress-life curves showed fatigue damage well below the constant amplitude fatigue limit, which suggests that constant amplitude fatigue data can give unconservative predictions if the applied spectrum includes overloads. Both materials had the same intrinsic fatigue limit (250 MPa), below which no fatigue damage occurs.; The constant amplitude fatigue limit for MMFX specimens in the corrosive environment was 22% lower than in lab air, while stainless steel specimens showed no reduction. However, both materials had reduced fatigue performance with the periodic overload spectrum in the corrosive environment, with lifespans reduced by 50 to 85%. Both steels retained their intrinsic fatigue limit in the corrosive environment. |
