발간논문

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Vol.30, No.4, 394 ~ 401, 1992
Title
A Study on the Characteristic of Low Cycle Fatigue in Al - Li Alloys
박동석Dong Seok park, 박현철Hyun Cheol Park, 오용준Young Jun Oh, 남수우Soo Woo Nam
Abstract
A study was undertaken to investigate the characteristic of low cycle fatigue behavior for aluminium alloy 2090 and 8090. Discontinuity of slope in the Coffin-Manson curve was observed for all the alloy systems and was attributed to difference in the deformation mode as a function of plastic strain amplitude related to fatigue crack initiation. At low applied plastic strain, strain localization by planar slip has been observed and fatigue cracks at the surface were initiated on the site of strain Localization. On the contrary, specimen cycled at high plastic strain exhibited homogeneous deformation and fatigue cracks at the surface have been observed on grain boundary. Therefore, the break in the Coffin-Manson plot is discussed in relation deformation mode with fatigue cracks initiation. Furthermore, it is observed that the decrease in elongation is due to Fe-Cu rich constituents segregated on grain boundary in Al 2090.
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