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Micromechanical modeling and experimental characterization for the elastoplastic behavior of a functionally graded material
International Journal of Solids and Structures ( IF 3.6 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.ijsolstr.2020.09.010
Liangliang Zhang , Qiliang Lin , Fangliang Chen , Yanchu Zhang , Huiming Yin

Abstract Functionally Graded Materials (FGMs) are characterized by the distribution in composition and structure gradually over volume, which were recently designed and developed as a key component of a multifunctional building envelope for the high performance of energy efficiency. It was realized by mixing aluminum particles and fine High-Density Polyethylene (HDPE) powders through a vibration-sedimentation process. To investigate the elastoplastic behavior of FGMs, an elastoplastic model based on micromechanics with pairwise particle interactions is developed in this study. The particle phase is assumed to remain in its linearly elastic state while the matrix phase undergoes elastoplastic deformation. The corresponding yield function for the FGMs is investigated, where the pairwise interaction and probabilistic spatial distribution of particles are utilized to accommodate the gradation of particle volume fraction. Accordingly, the overall elastoplastic behavior of FGMs is established through the microscopic homogenization. The proposed algorithm is validated with uniaxial compression test of FGM samples, where the authentic particle distribution is captured statistically through image processing method. Finally, the effect of volume fraction distributions on the overall effective elastoplastic behavior of FMGs is investigated.

中文翻译:

功能梯度材料弹塑性行为的微观力学建模和实验表征

摘要 功能梯度材料 (FGMs) 的特点是成分和结构在体积上逐渐分布,这是最近设计和开发的多功能建筑围护结构的关键组成部分,以实现高性能的能源效率。它是通过振动沉淀过程混合铝颗粒和细高密度聚乙烯 (HDPE) 粉末来实现的。为了研究 FGM 的弹塑性行为,本研究开发了一种基于具有成对粒子相互作用的微观力学的弹塑性模型。假定粒子相保持其线弹性状态,而基体相经历弹塑性变形。研究了 FGM 的相应屈服函数,其中利用粒子的成对相互作用和概率空间分布来适应粒子体积分数的等级。因此,FGM 的整体弹塑性行为是通过微观均质化建立的。所提出的算法通过 FGM 样品的单轴压缩测试进行了验证,其中真实的颗粒分布是通过图像处理方法统计捕获的。最后,研究了体积分数分布对 FMG 整体有效弹塑性行为的影响。其中真实的粒子分布是通过图像处理方法统计捕获的。最后,研究了体积分数分布对 FMG 整体有效弹塑性行为的影响。其中真实的粒子分布是通过图像处理方法统计捕获的。最后,研究了体积分数分布对 FMG 整体有效弹塑性行为的影响。
更新日期:2020-12-01
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