Corrosion and fatigue are the main form of failure of material components, in many cases, the two complement each other, promote each other, and jointly launched an attack on the material, as a pair of unity and mutual help “good brother”. This pair of “good brothers” appear together is corrosion fatigue, corrosion fatigue refers to the material in the alternating load and corrosive media synergistic, interactive effect occurs under a form of destruction, widely exist in aviation, ships and petroleum and other fields, corrosion fatigue damage is a serious problem faced by the project has become the industrial field of urgent need to be resolved! The subject. Today let's talk about the brother of corrosion - metal fatigue those things. Why metal fatigue?
Life experience tells us that it is very difficult to pull off the wire with bare hands, but it is easy to break it if it is repeatedly folded a few times. This shows that even if the repeated changes in the external force is much smaller than the constant force that can pull the metal directly, it will make its mechanical properties gradually weaken and eventually destroyed. This phenomenon of metal and human fatigue in long-term work is very similar, scientists will image called “metal fatigue”. Many small partners will be puzzled: people tired of fatigue, how hard metal will be fatigued? As the saying goes, “gold is not enough color, white jade has flaws”, we currently use the metal is not perfect, in the processing or use of the process, there will always be some defects in the metal, such as internal impurities or holes, scratches on the surface. These defects are often on the order of microns and are difficult to observe with the naked eye. If a constant tensile force is applied to the metal, they are not prone to cracking. However, if the external force is changed repeatedly, one moment is tension and the next is pressure, part of the energy will be converted into heat and accumulated inside the metal, once exceeding a certain limit, the metal will be easy to break chemical bonds between atoms at the defects, resulting in structural cracking.
