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金属由于受重复应力疲劳的时候,塑性变形集中在滑移带积蓄起来,沿着滑移面造成凸起或凹下,使表面极不规则。另外,裂纹的前端也可能形成塑性变形区域。为此金属表面严重分裂,表面的氧化皮发生微裂。为检查出这种金属表面氧化物的破坏,下面介绍二、三种进行金属疲劳检查的方法。测定金属疲劳程度最敏锐的方法,是从金属的塑性变形区域测定光电子发射情况。氧化物的电子与金属的情况不同。因为它与氧化物紧密地结合在一起。
Metal due to repeated stress fatigue, plastic deformation concentrated in the slip band to accumulate along the slip surface caused by the convex or concave, so that the surface is extremely irregular. In addition, the front end of the crack may also form a plastic deformation area. For this reason, the surface of the metal is severely fragmented and the surface of the oxide scale cracks. In order to check the destruction of such metal oxide surface, the following describes two or three methods for metal fatigue inspection. The most sensitive method of determining the degree of metal fatigue is the determination of the photoelectron emission from the area of plastic deformation of the metal. Oxide electrons and metals are different. Because it is closely combined with the oxide.