Development of multi-physics measurement system for corrosion-fatigue interaction fracture

为了通过腐蚀-疲劳相互作用来阐明断裂机理，我们开发了一种新的电化学/机械多物理测量系统来评价断裂过程中的腐蚀电场和应力/应变场。研究了铝合金在常温盐水溶液中的高压压铸成形。测量了其在恒拉应力下的极化特性，并进行了低周腐蚀疲劳的现场观察。实验发现，随着拉应力的增加，自发电位几乎呈线性下降，拉应力促进了电偶腐蚀。

To elucidate the fracture mechanism by the corrosion-fatigue interaction, we developed a new electrochemical/mechanical multi-physics measurement system to evaluate the corrosion electrical field and stress/strain fields in the fracture. The high-pressure die cast aluminum alloy in saline solution of room temperature was investigated. The polarization property under constant tensile stresses was measured, and the in situ observation of low-cycle corrosion fatigue was conducted. We found from the experiments that the spontaneous potential almost linearly decreased as the tensile stress increased and the galvanic corrosion was facilitated by the tensile stress.