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Abstract: Experimental
study is performed on the probability- based cyclic constitution models
for LZ50 axle steel. It is verified that the random cyclic
constitutions, like the wide recognized random cyclic strain-life
relations, are intrinsic fatigue phenomena of engineering materials.
Taking into account the integrated effects on the probabilistic
assessment of the scattering regularity and the sampling size,
probability-based constitution models with arbitrary survival
probability and arbitrary confidence are constructed, respectively, by
the Ramberg-Osgood equation and its modified form. Availability and
feasibility of the models are indicated by analysis of the present test
data.
Key
words: LZ50
axle steel Random cyclic constitutions Modified Ramberg-Osgood
equation
CLC No: O346.2
TB114.3 U270.331
国家自然科学基金(50075073)、全国优秀博士学位论文作者专项资金(200234)、教育部优秀青年教师资助计划项目(2101)和铁道部科技研究开发计划
(2001J016)资助项目. Received 20031011, received in revised form 20040416
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