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Abstract: Three
improved methods are proposed for the measurements of probabilistic
fatigue limits under the fatigue tests of up-and-down method. It is
revealed that the conventional method for the measurements couldn’t
reasonably reflect the stochastic feature of the limits, and exists
inevitably errors of measurements. The improved methods, by the three
possible cases of given test data, are constructed by the so-called
“random localized Basquin S-N relations” in the range of around the
limits. The randomness for the limits is represented by the fatigue
lives related to the local relations. Availabilities of the improved
methods are indicated by the estimations of the probabilistic fatigue
limits of LZ50 axle steel for the Chinese railway vehicles.
Key words: Fatigue
limit Probabilistic analyses LZ50 steel
CLC No: O346.2
TB114.3 U270
全国优秀博士学位论文作者专项资金(200234)、国家自然科学基金(50075073)、教育部优秀青年教师资助计划项目(2101)、铁道部科技研究开发计划项目(2001J016)和西南交通大学校基金资助项目.
Received 20030610, received in revised form 20030910
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