A 3D nonlinear viscoelastic–viscoplastic constitutive model for dynamic response of an epoxy resin

IF 2.3 3区 工程技术 Q2 MECHANICS Acta Mechanica Pub Date : 2024-08-25 DOI:10.1007/s00707-024-04065-z
Reza Yazdanparast, Roham Rafiee
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Abstract

A three-dimensional viscoelastic-viscoplastic constitutive model is presented for predicting the dynamic mechanical behavior of an epoxy resin at low-to-medium strain rates. The model utilizes the generalized Maxwell model, incorporating two Maxwell elements in parallel with a nonlinear spring to represent the viscoelastic response at low and medium strain rates. By utilizing an empirical logarithmic relationship to predict the material properties at different strain rates, a nonlinear exponential relation based on overstress concepts is proposed for modeling the viscoplastic behavior. Comparing the tensile and shear stress–strain curves predicted by the proposed model with the experimentally measured curves, a good agreement is observed. Implementing the viscoelastic-viscoplastic model in commercial finite element software, a three-dimensional numerical discretization is performed. Through simulations of stress-relaxation and loading–unloading tests at various strain rates using the proposed material model, relaxation and hysteresis responses are analyzed. The model successfully predicts the experimentally measured hysteresis response of a specific epoxy resin during the loading cycle, consistent with other nonlinear viscoelastic models. This material model not only well replicates the nonlinear viscoelastic responses below the yield strain but also captures plastic nonlinearities at different strain rates.

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环氧树脂动态响应的三维非线性粘弹性-粘塑性构成模型
本文介绍了一种三维粘弹性-粘塑性构成模型,用于预测环氧树脂在中低应变速率下的动态机械行为。该模型采用广义麦克斯韦模型,将两个并联的麦克斯韦元素与一个非线性弹簧结合在一起,以表示中低应变速率下的粘弹性响应。通过利用经验对数关系来预测不同应变速率下的材料特性,提出了一种基于过应力概念的非线性指数关系来模拟粘弹行为。将所提模型预测的拉伸和剪切应力-应变曲线与实验测量曲线进行比较,可以观察到两者之间有很好的一致性。在商用有限元软件中实施粘弹性-粘塑性模型后,进行了三维数值离散化。通过使用所提出的材料模型模拟各种应变速率下的应力松弛和加载-卸载试验,分析了松弛和滞后响应。该模型成功预测了实验测量到的特定环氧树脂在加载周期内的滞后响应,与其他非线性粘弹性模型一致。该材料模型不仅很好地复制了屈服应变以下的非线性粘弹性响应,而且还捕捉到了不同应变速率下的塑性非线性。
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来源期刊
Acta Mechanica
Acta Mechanica 物理-力学
CiteScore
4.30
自引率
14.80%
发文量
292
审稿时长
6.9 months
期刊介绍: Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.
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