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关键失效模式
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  significant failure mode
    This paper presents two evaluation methods for the reliability of structures, i,e, the transformation method and the weighting average method, for the most significant failure mode, based on small number samples.
    本文提出了在小子样试验的前提下,结构系统关键失效模式可靠度预测的两种方法,其一是基于抽样分布分析的转换法。
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  “关键失效模式”译为未确定词的双语例句
    A Key Failure Mode Resulting in Interfacial Fracture of Soldered ENIG Surface
    ENIG表面产生焊接界面断裂的关键失效模式
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    The calculating formula for fatigue reliability of single component was deduced. A criterion of fatigue failure of integral platform and the method for determining key failure mode of platform were suggested,and the computing method for failure probability of integral platform was presented.
    在此基础上给出了单个构件的疲劳可靠性计算公式,提出了平台整体疲劳失效的简化判断依据和平台关键失效模式的确定方法,并给出了平台整体失效概率的计算方法。
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  significant failure mode
Large-scale delamination between plies has been a significant failure mode for composite structures, particularly with out-of-plane loads.
      


This paper presents two evaluation methods for the reliability of structures, i,e, the transformation method and the weighting average method, for the most significant failure mode, based on small number samples. In the first method, the transformation from normal distribution integration to t-distribution integration is strictly derived according to the sample distribution analysis, loads and component strength being assumed to be normal variables with unknown distribution parmeters in the derivation. The second...

This paper presents two evaluation methods for the reliability of structures, i,e, the transformation method and the weighting average method, for the most significant failure mode, based on small number samples. In the first method, the transformation from normal distribution integration to t-distribution integration is strictly derived according to the sample distribution analysis, loads and component strength being assumed to be normal variables with unknown distribution parmeters in the derivation. The second method is established with the fuzzy theory, yet it requires a membership function of the distrbution parameters given by experts according to their experiences and the experimental data. The second method has no requirement about the number of the samples n, yet it relys strongly on the degree of accuracy of the experiences of experts (it requires n > 2) . An example is given to il-lustate differences of the two methods. And in the example it also shows that the reliability of the structure systems overestimated as the normal distribution method is used under the small samples.

本文提出了在小子样试验的前提下,结构系统关键失效模式可靠度预测的两种方法,其一是基于抽样分布分析的转换法。在这种方法中,严格推导了元件强度和外载为正态分布时,可靠度计算从正态分布概率积分到t分布概率积分的转换。它适用于试验样本数不小于2的情况;其二是基于模糊学原理的加权平均法。此方法要求根据专家经验和现场数据,给出强度和载荷分布参数的隶属函数,然后用加权平均法给出结构系统关键失效模式的可靠度,这种方法对试验样本数没有要求,但专家经验的丰富程度对这种方法预测的可靠度有较大影响。文中用算例说明了两种方法的差异,并且说明了在小子样试验情况下,直接用样本分布参数来进行可靠度计算的结果是偏危险的。

A simplified method for calculating the fatigue damage of components under random wave and ice load was presented.This method was used to analyze the reliability of components and integral platform.The exponential functions were used to reflect the relationship among fatigue stress,number of stress cycles and environmental parameters.The fitting precision of the functions was relatively high.The expression of fatigue damage was obtained on the basis of exponential functions,the S-N curve and the Miner linear...

A simplified method for calculating the fatigue damage of components under random wave and ice load was presented.This method was used to analyze the reliability of components and integral platform.The exponential functions were used to reflect the relationship among fatigue stress,number of stress cycles and environmental parameters.The fitting precision of the functions was relatively high.The expression of fatigue damage was obtained on the basis of exponential functions,the S-N curve and the Miner linear accumulative damage theory.The calculation process of fatigue damage of components was simplified.The calculating formula for fatigue reliability of single component was deduced.A criterion of fatigue failure of integral platform and the method for determining key failure mode of platform were suggested,and the computing method for failure probability of integral platform was presented.The calculated results show that this computing method is convenient and accurate.It is suitable for engineering application.

给出了在随机波浪载荷和冰载荷作用下平台构件疲劳损伤的一种计算方法,并利用该方法分析了平台单个构件和平台整体的疲劳可靠性。用指数函数对波浪和海冰作用下平台构件的疲劳应力、应力循环次数和环境参数的关系进行了拟合,拟合精度很好。根据拟合的指数函数,并基于S—N曲线和Miner线性累积疲劳损伤理论,推导出构件疲劳损伤的计算公式,使构件疲劳损伤的计算过程得到很大简化。在此基础上给出了单个构件的疲劳可靠性计算公式,提出了平台整体疲劳失效的简化判断依据和平台关键失效模式的确定方法,并给出了平台整体失效概率的计算方法。计算实例表明,该方法简单可靠,可以有效地用于工程实际。

 
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