根据点蚀坑的特点，将锈蚀钢材表面点蚀坑简化为半椭球形，引入锈蚀损失率作为锈蚀损伤参量，并利用细观损伤力学和自洽方法建立锈蚀后钢材的锈蚀损伤弹性理论模型；再对 Q235钢进行室内盐雾加速试验和单向拉伸试验，得到不同锈蚀时间试样的锈蚀损失率、弹性模量和屈服强度，并将单向拉伸试验结果与模型计算结果进行了对比验证。结果表明：使锈蚀速率临界点提前可显著降低锈蚀对钢结构材料造成的损伤；模型计算值与试验值吻合较好，验证了所建立计算模型的可行性和正确性。
The corrosion pit on the steel surface was considered as the semi-ellipsoid based on its characteristics,and the corrosion loss rate was introduced as a damage parameter,then the elastic model of the steel corrosion damage was established by using the damage micromechanics and self-consistent method.The corrosion loss rate,elastic modulus and yield strength of Q235 steel for various corrosion periods was obtained by the indoor salt spray accelerated test and uniaxial tensile test and compared with the simulation values from the elastic model. The results show that early critical point of corrosion rate reduced the damage of corrosion on structural steel significantly;the experiment value was consistent with the theoretical calculation value,indicating the excellent feasibility and accuracy of the established theoretical model.
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