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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >Micromechanical modeling of the elasto-viscoplastic behavior of semi-crystalline polymers
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Micromechanical modeling of the elasto-viscoplastic behavior of semi-crystalline polymers

机译：半结晶聚合物弹黏塑性行为的微力学建模

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摘要

A micromechanically based constitutive model for the elasto-viscoplastic deformation and texture evolution of semi-crystalline polymers is developed. The model idealizes the microstruc-ture to consist of an aggregate of two-phase layered composite inclusions. A new framework for the composite inclusion model is formulated to facilitate the use of finite deformation elasto-viscoplastic constitutive models for each constituent phase. The crystalline lamellae are modeled as anisotropic elastic with plastic flow occurring via crystallographic slip. The amorphous phase is modeled as isotropic elastic with plastic flow being a rate-dependent process with strain hardening resulting from molecular orientation. The volume-averaged deformation and stress within the inclusions are related to the macroscopic fields by a hybrid interaction model. The uniaxial compression of initially isotropic high density polyethylene (HDPE) is taken as a case study. The ability of the model to capture the elasto-plastic stress-strain behavior of HDPE during monotonic and cyclic loading, the evolution of anisotropy, and the effect of crystallinity on initial modulus, yield stress, post-yield behavior and unloading-reloading cycles are presented.
机译：建立了基于微机械的本构模型，用于半结晶聚合物的弹黏塑性变形和织构演化。该模型理想化了微观结构，使其由两相层状复合夹杂物的聚集体组成。制定了复合夹杂物模型的新框架，以促进对每个组成相使用有限变形弹塑性粘塑性本构模型。结晶薄片被建模为各向异性弹性，通过结晶滑移发生塑性流动。非晶相被建模为各向同性弹性，塑性流动是速率依赖的过程，具有因分子取向而引起的应变硬化。夹杂物中的体积平均变形和应力通过混合相互作用模型与宏观场有关。以最初各向同性的高密度聚乙烯（HDPE）的单轴压缩为例。该模型能够捕获HDPE在单调和循环加载过程中的弹塑性应力-应变行为，各向异性的演化以及结晶度对初始模量，屈服应力，屈服后行为和卸载-再加载循环的影响提出了。

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