著者

大﨑 修平 原野 徹 薮田 均

出版者

一般社団法人 軽金属学会

雑誌

軽金属 (ISSN:04515994)

巻号頁・発行日

vol.58, no.9, pp.456-461, 2008-09-30 (Released:2008-10-31)

参考文献数

20

被引用文献数

2 4

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Fatigue crack growth (FCG) properties were determined for aluminum alloy 6061-T6 and 7075-T6 plates exposed to a humid (relative humidity RH=90%) air or dry nitrogen gas, and the effect of hydrogen on the FCG process was discussed together with a fractographic study of fracture surfaces. The 6061-T6 shows a superior FCG resistance to the 7075-T6, resulting in no increase in FCG rate with a reduction of frequency from 10 Hz to 0.1 Hz and also with a change of cyclic loading wave from sine to trapezoid. This response is attributed to the effect of hydrogen to assist localized slip deformation, leading to a crack-tip bunting. According to applying the present FCG data to design a high-pressure container liner for automobile on a basis of the engineering standard JARI S001, it is found that the 6061-T6 can possess a higher allowable stress than the 7075-T6.