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A stochastic approach for predicting the temperature-dependent elastic properties of cork-based composites
Mechanics of Materials ( IF 3.9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.mechmat.2020.103399
Marco Delucia , Anita Catapano , Marco Montemurro , Jérôme Pailhés

Abstract This work deals with the problem of predicting the temperature-dependent equivalent elastic properties of cork-based composites by investigating the influence of the variability related to the material properties of natural cork. A dedicated numerical homogenisation approach based on the strain energy of periodic and a-periodic media has been developed to this purpose. The proposed methodology is based, on the one hand, on an efficient modelling strategy capable to generate 2D and 3D finite element models which closely emulates the realistic meso-structure of the agglomerate. On the other hand, the strategy makes use of the Monte Carlo algorithm to study the influence of the variability in model inputs on the equivalent elastic behaviour of the cork-based composite at different temperatures. Firstly, the effectiveness of the modelling strategy in representing a realistic meso-structure of the agglomerate, in terms of geometry, has been evaluated by comparing the numerical results to digital images of real cork-based composites. Secondly, the homogenisation strategy has been applied to a realistic configuration of cork agglomerate. Numerical results show that the greater the temperature the lower the overall stiffness of the agglomerate, according to natural cork trends, but the variability related to the macroscopic equivalent elastic properties of the agglomerate is considerably lower than that affecting the elastic behaviour of the natural cork, which represents a positive result concerning the use of cork agglomerates in industrial applications.

中文翻译:

一种预测软木基复合材料随温度变化的弹性特性的随机方法

摘要 这项工作通过研究与天然软木材料特性相关的可变性的影响来解决预测软木基复合材料与温度相关的等效弹性特性的问题。为此,开发了一种基于周期和非周期介质应变能的专用数值均匀化方法。一方面,所提出的方法基于一种有效的建模策略,该策略能够生成 2D 和 3D 有限元模型,该模型紧密地模拟了团聚体的真实细观结构。另一方面,该策略利用蒙特卡罗算法来研究模型输入的可变性对不同温度下软木复合材料等效弹性行为的影响。首先,通过将数值结果与真实软木复合材料的数字图像进行比较,已经评估了建模策略在表示附聚物的真实细观结构方面的有效性,在几何方面。其次,均质化策略已应用于软木附聚物的实际配置。数值结果表明,根据天然软木趋势,温度越高,团块的整体刚度越低,但与团块宏观等效弹性特性相关的变异性远低于影响天然软木弹性行为的变异性,这代表了在工业应用中使用软木附聚物的积极结果。已经通过将数值结果与真实软木复合材料的数字图像进行比较来评估。其次,均质化策略已应用于软木附聚物的实际配置。数值结果表明,根据天然软木趋势,温度越高,团块的整体刚度越低,但与团块宏观等效弹性特性相关的变异性远低于影响天然软木弹性行为的变异性,这代表了在工业应用中使用软木附聚物的积极结果。已经通过将数值结果与真实软木复合材料的数字图像进行比较来评估。其次,均质化策略已应用于软木附聚物的实际配置。数值结果表明,根据天然软木趋势,温度越高,团块的整体刚度越低,但与团块宏观等效弹性特性相关的变异性远低于影响天然软木弹性行为的变异性,这代表了在工业应用中使用软木附聚物的积极结果。
更新日期:2020-06-01
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