拘束された延性母材における最終破壊ボイド率

概要

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The tensile tests of 2024-T6 aluminum alloy reinforced by 2% and 10% SiC particles are conducted. The stress-triaxiality of the specimens is changed from 0.33 to 2.5 in 7 cases by changing the notch radius of the specimen. The effect of stress-triaxiality on viod volume fraction at final fracture by coalescence of micro voids is investigated using SEM (Scanning Electron Microscope) and 3-dimensional imaging analysis system. The experimental results show that the final void volume fraction at fracture changes by changing the stres-striaxiality and SiC particle volume fraction. The void diameter and depth also change by the SiC particle volume fraction and stess-triaxiality. Observation on fracture surface shows that the number of voids increases with decreases of the stress-triaxiality and SiC particle volume fraction. The effect of stress triaxiality strongly affects on the fracture process of SiC 0%, pure matrix, and the effect of SiC particle volume fraction strongly affects on that of low stress-triaxiality condition specimens.
一般社団法人日本機械学会の論文
2004-02-25