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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >Composite laminate oriented reliability analysis for fatigue life under non-probabilistic time-dependent method
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Composite laminate oriented reliability analysis for fatigue life under non-probabilistic time-dependent method

机译：非概率时间依赖方法的复合材料层板疲劳寿命可靠性分析

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摘要

The problem of composite laminate fatigue assessment under small samples and less probability information is always concentrated, and the mechanical properties of composite structure are deteriorated due to damage accumulation effect of fatigue issue. On the basis of analyzing the current reliability modeling method, this paper developed the reliability evaluation strategy based on the non-probability theory, and considering composite structure response to the external cycle load influence, time-varying reliability analysis model is established, which is different from the quasi-static analysis method, and finally the application for composite structure fatigue problem based on the non-probability of the time-varying reliability analysis is put forward. In the proposed method, every single layer reliability is analyzed combining the non-probabilistic theory with Tsai-Wu failure criterion model, comparing with the traditional probabilistic reliability theory, the method of non-probability is not constrained by probability distribution information, in view of that, the approach has stronger practicability; Introducing for the first-passage conceptions, the crossing rate is evaluated through the non-probabilistic reliability method, finally the time-varying reliability index of composite material structure is established. After analysis steps are given in detail, laminated plate structure is presented to demonstrate the validity and reasonability of the developed methodology. (C) 2017 Elsevier B.V. All rights reserved.
机译：小样本，概率信息少的复合材料层板疲劳评估问题总是集中存在，复合结构的力学性能由于疲劳问题的损伤累积效应而恶化。在分析现有可靠性建模方法的基础上，提出了基于非概率理论的可靠性评估策略，并考虑了复合结构对外部循环荷载影响的响应，建立了时变可靠性分析模型。从准静态分析方法出发，最后提出了基于时变可靠性分析的非概率性的复合结构疲劳问题的应用。在该方法中，将非概率理论与蔡-吴故障准则模型相结合，对每个单层可靠性进行了分析，与传统的概率可靠性理论相比，非概率方法不受概率分布信息的约束，该方法具有较强的实用性；首先引入概念，通过非概率可靠性方法对穿越率进行评估，最后建立了复合材料结构的时变可靠性指标。在详细给出分析步骤之后，提出了层压板结构，以证明所开发方法的有效性和合理性。 （C）2017 Elsevier B.V.保留所有权利。

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