摘要
本文在国内外大量试验研究的基础上,建立了关于寿命N和应力水平S的二维概率模型,并用MLE方法(最大似然法)对二维概率模型中的参数进行了估计,方便、准确地得到各种P—S—N曲线的表示方法。最后通过实例,证明用这种方法求大型结构中的P—S—N曲线时,对数据要求非常宽松,可在保证统计精度的前提下,减少试件数量。
Based upon a lot of experiments and researches carried out in China and abroad, this paper establishes a 2-dimensional probability model of lifetime N against stress level S, and estimates the parameters of the model by using MLE (maximum likelihood estimate) method. The way to express different P-S-N curves is easyly and accurately obtained. Finally, through a practical example showing that, the offered method requires no strict limitations to experimental data in establishing P-N-S curves for large steel structures and demands less samples, while keeping the statistical accuracy at the same level.
出处
《起重运输机械》
1989年第7期3-9,共7页
Hoisting and Conveying Machinery
