“…This bright region, with a dark region (the defect) inside, may be observed on the fracture surface by the naked eye or a microscope after fatigue failures. This typical fractography feature is known as fish‐eye, which was discovered in 1968 by Ohuchida 1 on the fracture surface of Cr–Ni–Mo high carbon alloy steel under rotating bending fatigue loading.…”
A B S T R A C T In this paper, a model using the energy approach was established to investigate the formation of fish-eye shape in the gigacycle fatigue failure. The model was used to predict the size of the fish-eye formed by a given subsurface inclusion. The predicted results were comparable with the fractography of SNCM439 steel and other experimental results of gigacycle fatigue available in the literature. The current model can capture the fish-eye shape and can be used to predict the life of crack initiation during fatigue failure.
“…This bright region, with a dark region (the defect) inside, may be observed on the fracture surface by the naked eye or a microscope after fatigue failures. This typical fractography feature is known as fish‐eye, which was discovered in 1968 by Ohuchida 1 on the fracture surface of Cr–Ni–Mo high carbon alloy steel under rotating bending fatigue loading.…”
A B S T R A C T In this paper, a model using the energy approach was established to investigate the formation of fish-eye shape in the gigacycle fatigue failure. The model was used to predict the size of the fish-eye formed by a given subsurface inclusion. The predicted results were comparable with the fractography of SNCM439 steel and other experimental results of gigacycle fatigue available in the literature. The current model can capture the fish-eye shape and can be used to predict the life of crack initiation during fatigue failure.
“…It is imperative to point out that the fish-eye feature was reported by Ohuchida for the first time in 1961. He suggested that fish-eye appear in the fracture surface of metallic materials which possess higher hardness on the surface [38]. He related in his experiments that the fish-eye could not appear in the fracture surface for specimens with hardness below 550 HV.…”
Teixeira, Maria Clara Carvalho; Pereira, Marcos Venicius Soares (Advisor). Fatigue failure assessment in ultrasonic test based on temperature evolution and crack initiation mechanisms. Rio de Janeiro, 2023. 103p.
“…37 Figura 16: Diferentes estágios da evolução da trinca no UHCF [15,16]. 39 Figura 17: Curva S-N e relação de dureza obtida por Ohuchida [18]. 40 Figura 18: a) Fish-eye numa superfície de fratura.…”
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