G. Klevtsov, D. Merson, N. Klevtsova, E. Merson, M. Linderov, S. Zasypkin, A. Bondarenko
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引用次数: 3
摘要
目前已知，结构或机械零件的击穿断裂大多与疲劳断裂或疲劳裂纹引起的脆性断裂有关。因此，为了减少疲劳裂纹萌生和发展的可能性，通常采用昂贵的中合金钢和高合金钢。本文对低合金化40H钢和中合金化38H2N2MA钢试样的疲劳断裂参数进行了对比分析。在温度为20℃的Instron 8802安装装置上，按照ⱱ=10 Hz, R =0.1和各种Δ的三点弯曲方案，对带有U形和v形应力集中器的40H钢10×15×80 mm棱镜试样和带有U形应力集中器的38H2N2MA钢试样进行了疲劳试验
THE KINETICS AND MECHANISM OF THE FATIGUE FRACTURE OF SAMPLES OF 40H AND 38H2N2MA STEELS
: It is known that the most of breakdown fractures of the structures or machine parts are related either to the fatigue fracture or brittle fracture caused by the fatigue crack. For this reason, to reduce the possibility of the fatigue crack initiation and development, the expensive medium and highly alloyed steels are often used. This paper presents the com-parative analysis of the parameters of the fatigue fracture of samples of low alloyed 40H steel and medium alloyed 38H2N2MA steel. The fatigue tests of 10×15×80 mm prism samples made of 40H steel with the U - and V-shaped stress concentrators and of 38H2N2MA steel samples with the U-shaped stress concentrator were carried out on the Instron 8802 installation at the temperature of 20 °C according to the three -point bending scheme with ⱱ =10 Hz, R =0.1 and various Δ
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