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RELATIONSHIP BETWEEN FRACTAL DIMENSION AND CYCLIC CREEP PROPERTIES OF ROTOR STEEL 34CrMoA

YI Jianzhang Shenyang Institute of Aeronautical Engineering , Shenyang , ChinaYANG Zhi'an ZHU Shijie WANG Zhongguang Institute of Metal Research , Academia Sinica , Shenyang , China lecturer , Department of Safety Engineering , Shenyang Institute of Aeronautical Engineering , Shenyang 110031 , China

金属学报(英文版)

Vertical section method has been used to measure the fractal dimension of cyclic creep frac- ture surfaces of rotor steel 34CrMoA at 550℃.The relationship between fractal dimension and cyclic creep properties has been analyzed.The fractal dimension is dependent upon the power product of minimum creep rate and rupture time,and satisfies the linear function with rupture strain.

关键词: cyclic creep , null , null , null

QUANTITATIVE RELATION BETWEEN YIELD STRESS AND R-VALUE OF Ti PLATE ALONG PARALLEL AND PERPENDICULAR TO ROLLING DIRECTION

ZHANG Derong Shenyang Institute of Aeronautical Engineering , Shenyang , China ZHANG Derong Associate Professor.Dept.of Aeronautics , Shenyang Institute of Aeronautical Engineering , Shenyang 110031 , China

金属学报(英文版)

An attempt was made on the quantitative prediction of the relationship hetween the yield stress and R-value along the parallel and perpendicular to the rolling direction of Ti plate based on analysis of the previous experimental data.It is shown that the yield stress along one direction and another is quite synchronized with the R—value.According to the plasticity theo- ry,an formular of σ_(1s)/σ_(2s)=[(1+1/R_2)/(1+1/R_1)/~(1 2) was proposed,In statistic estima- tion.the calculated results are in good agreement with the experimental data.The availability of this formula was briefly discussed also.

关键词: titanium plate , null , null

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