结构健康监测可靠性的若干问题

Vitalijs Pavelko
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引用次数: 0

摘要

本研究分析了受静态或循环载荷作用的结构部件内置压电传感器(PET)的应力状态和强度。所有结果和结论均适用于矩形薄 PET。使用了强化铝合金面板的疲劳测试数据和有限元分析结果。对疲劳试验数据进行了一般统计估算。结果表明,在所考虑的条件下,PET 在典型水平的循环载荷下发生破坏的概率很高。对内置 PET 的应力状态进行了详细的有限元分析,并在此基础上预测了单调递增载荷下 PET 的脆性破坏发展为等碎片破碎(EFC),并描述了其特性。EFC 过程适用于循环载荷下的 PET 破坏,并用于构建 PET 疲劳强度的似然估计 (LHE)。利用 LHE 模型,获得了疲劳强度正态分布参数的估计值。给出了内置 PET 强度和纯拉伸 PET 的一般比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Some problems of reliability of structural health monitoring

Analysis of stress state and strength of piezoelectrical transducer (PET) in-built to structural component which loaded by static or cyclic load is done. All results and conclusions are applicable for thin PET of rectangular shape. The data of the fatigue test of reinforced Al-alloy panel and FEA results were used. The general statistical estimation of fatigue test data was made. The high probability of PET destruction at the cyclic load of typical level is shown for considered conditions. The detailed FEA of in-built PET stress state is performed, and in this base the development of brittle PET destruction at monotonically increasing load was predicted as equi-fragmental crushing (EFC) and its properties were described. The EFC process was adapted to PET destruction at cyclic load and used for construction of likelihood estimation (LHE) of the fatigue strength of PET. Using LHE model, the estimation of parameters of the normal distribution of the fatigue strength was obtained. The general comparison of in-built PET strength and PET at pure tension is given.

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