PS42 金属基複合材料/Al合金二層材の界面垂直き裂の疲労進展特性(フェロー賞対象ポスターセッション)

概要

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In this study the interface effect on the location dependence of the crack growth characteristics by fatigue of an aluminum cast alloy locally reinforced by Al_2O_3 whiskers and SiC particles is studied experimentally. The crack grows normal to the interface between the metal matrix composite (MMC) and the aluminum alloy. The crack growth rate under a constant stress intensity factor range condition showed deceleration with crack growth in MMC. The residual stresses due to casting of the layered material of MMC and aluminum alloy were measured using the strain release method. The deceleration of crack growth rate can be attributed to the compressive residual stress in MMC. The mechanical effect of residual stress on the stress intensity factor of a crack nonnal to the MMC/aluminum alloy interface with residual stress field is evaluated based on the principle of superposition.
2010-10-09