A dynamic criterion for failure probability prediction of GFRP laminates using Lamb wave velocity with improved accuracy and consistency
A dynamic criterion for failure probability prediction of GFRP laminates using Lamb wave velocity with improved accuracy and consistency
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使用 Lamb 波速预测 GFRP 层压板失效概率的动态准则，提高了准确性和一致性
DOI：
10.1016/j.compstruct.2022.115578
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发表时间：
2022-04
影响因子：
6.3
通讯作者：
Jinhao Qiu
中科院分区：
文献类型：
--
作者：
Lingyao Cen;Chongcong Tao;Chao Zhang;Hongli Ji;Jinhao Qiu
本文提出了一种基于Lamb波速的提高玻璃钢层板疲劳寿命和失效概率预测性能的动态判据。通过引入正态分布随机变量来表示不确定性，在Lamb波速退化模型的基础上建立了统计损伤模型。模型参数的后验分布通过贝叶斯推断和Metropolis-Hastings算法分别得到无信息和有信息的先验分布。最重要的是，假设由于初始缺陷的随机性，每个试件的临界损伤阶段(CDS)不同，提出了一种动态准则来获得特定于试件的失效门限值。通过试验验证，预测的疲劳寿命与动态判据和传统的静态判据进行了比较。结果表明，动态判据的应用可以提高预测的精度和一致性，特别是在可用数据有限的早期阶段。
This paper presents a dynamic criterion for improving the performance on fatigue life and failure probability prediction of GFRP laminates using Lamb wave velocity. A statistic damage model is built upon a Lamb wave velocity degradation model by introducing a normal distributed random variable to represent the uncertainties. The posterior distributions of the model parameters are obtained by Bayesian inference and Metropolis-Hastings algorithm with noninformative and informative prior distributions. Most importantly, a dynamic criterion is proposed to obtain a specimen-specific failure threshold value based on an assumption that the critical damage stage (CDS) of each specimen differs due to the randomicity of initial flaws. Experimental validation is conducted to compare the predicted fatigue life with both the dynamic criterion and traditional static criterion. The results show that applications of the dynamic criterion can improve the predicting accuracy and consistency, especially during early stages when available data is limited.
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