NETWORK EVOLUTION MODEL OF ANISOTROPIC STRESS SOFTENING IN FILLED RUBBER-LIKE MATERIALS: PARAMETER IDENTIFICATION AND FINITE ELEMENT IMPLEMENTATION
NETWORK EVOLUTION MODEL OF ANISOTROPIC STRESS SOFTENING IN FILLED RUBBER-LIKE MATERIALS: PARAMETER IDENTIFICATION AND FINITE ELEMENT IMPLEMENTATION
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DOI：
10.2140/jomms.2012.7.861
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发表时间：
2012-10-01
影响因子：
0.9
通讯作者：
Itskov, Mikhail
中科院分区：
文献类型：
--
作者：
Dargazany, Roozbeh;Vu Ngoc Khiem;Itskov, Mikhail
作者之前提出了一种纯微力学网络进化理论，对损伤机制有了新的认识（Dargazany和Itskov， 2009）。在这篇后续的论文中，我们进一步制定了网络演化模型，以便在有限元模拟中实现。为此，提出了一种基于自由能函数确定微观结构非弹性响应的通用内变量公式。分析验证了网络演化模型的热力学一致性。接下来，通过几个专门设计的实验来证明模型的预测能力，以捕获应力软化，永久集和诱导各向异性。最后，研究了填料浓度对材料参数的影响。
A purely micromechanical network evolution theory granting new insight into the damage mechanism was proposed previously by the authors (Dargazany and Itskov, 2009). In this follow-up paper, we further formulate the network evolution model for implementation into finite element simulations. To this end, a general internal variable formulation is developed which determines the inelastic response of the microstructure on the basis of the free energy function. The thermodynamical consistency of the network evolution model is then verified analytically. Next, the predictive capabilities of the model are demonstrated by means of several experiments especially designed to capture stress softening, permanent set, and induced anisotropy. Finally, the influence of the filler concentration on material parameters is studied.