電子顕微鏡による疲労破面観察例

概要

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Various and valuable information have long been known to exist in the fracture surface of materials, and electron fractography has recently become a powerful tool for studying the topographic feature of fatigue fracture surfaces. For the purpose of collecting microfractographic topographies of fatigue fracture surfaces, observation by a transmission or a scanning electron microscopy was carried out on fracture surfaces of wedge-opening loading type specimens, round notched specimens and hour-glass shaped welded joint specimens. As all of the specimens were tested in tension-compression load cycles, the fracture surfaces were observed to be changed almost featureless or flat by rubbing due to compressive load. However, there remained some topographies such as striation, dimple, tire trucks and so on. The amount of the topography were too small to be analyzed them quantitatively, but they presented valuable information for deducing origin of fatigue crack intiation and paths of fatigue crack, and cause of contamination of the surfaces. This paper presents typical topographies of the fatigue fracture with discussion on them.
独立行政法人海上技術安全研究所の論文
1975-05-31