考虑表面形貌的腐蚀钢板疲劳缺口系数

Fatigue notch factor of corrosion steel plate considering surface topography

为有效模拟钢板腐蚀后的复杂形貌,得到基于真实表面形貌的钢板疲劳缺口系数,采用盐雾法对Q235钢板进行快速腐蚀试验,并对腐蚀表面进行三维测量.利用逆向工程软件Geomagic Studio和数值分析软件ANSYS建立三维腐蚀实体模型,分析表面应力分布.最终通过计算得到了疲劳缺口系数值,并将计算结果和试验结果进行对比.结果表明有限元分析结果与疲劳试验结果两者误差非常小,从而验证了模拟方法的可行性.通过Geomagic Studio可实现快速三维可视化建模,非常好地模拟腐蚀形貌特征,结合ANSYS可灵活、高效地估算各种复杂形貌构件的疲劳缺口系数.

To simulate the complex morphology of steel plate and obtain the fatigue notch factor based on real surface topography, the Q235 steel plate was corroded rapidly by salt spray method, and the corrosion surface was measured by three dimensional measurement. Three-dimensional solid model was established, and the surface stress distribution was analyzed by reverse engineering Geomagic Studio software and numerical analysis software ANSYS. Then the numerical results and experimental results were compared. The results show that the error is small enough, which verifies the feasibility of the modeling methods. Geomagic studio can achieve a rapid 3D visual modeling and simulate the corrosion morphology well, combined with ANSYS, it can estimate the fatigue notch factors of various complex morphology components flexibly and efficiently.