聚氨酯弹性体在宽应变率范围内的压缩行为和粘弹性构造

IF 5 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Polymer Testing Pub Date : 2024-09-01 DOI:10.1016/j.polymertesting.2024.108553
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引用次数: 0

摘要

聚氨酯弹性体(PUE)在不同的应用场景中会经历不同的应变速率。因此,研究聚氨酯弹性体在各种应变速率下的机械性能,并建立一个高精度、少参数、考虑应变速率的构成模型具有重要意义。本研究对两种 PUE(PUE55 和 PUE85)进行了准静态和动态压缩试验,研究了材料的应变率效应。在 Mooney-Rivlin 超弹性模型和 Prony 系列的基础上,建立了 PUE 的可压缩粘-超弹性构成模型。与 Prony 系列中传统的恒定松弛时间不同,根据松弛试验提出了两个随主拉伸呈指数变化的松弛时间,以分别描述材料在低应变率和高应变率下的应变率效应。此外,利用粘弹性-超弹性构成模型获得 LS-DYNA 中简化橡胶/泡沫模型的模型输入,通过有限元仿真再现了金属/PUE 复合材料弹丸在不同冲击条件下的冲击过程。仿真结果验证了粘弹性模型在生成数值模型材料参数方面的作用,以及简化橡胶/泡沫模型在描述 PUE 方面的合理性。
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Compressive behavior and visco-hyperelastic constitutive of polyurethane elastomer over a wide range of strain rates

Polyurethane elastomers (PUEs) will experience different strain rates in different application scenarios. Therefore, it is of great significance to study the mechanical properties of PUE under a wide range of strain rates and establish a constitutive model that considers strain rates with high accuracy and few parameters. In this study, the quasi-static and dynamic compression tests of two types of PUEs (PUE55 and PUE85) were carried out, and investigated the strain rate effect of the materials. Based on the Mooney-Rivlin hyperelastic model and the Prony series, a compressible visco-hyperelastic constitutive model for PUE was established. Different from the conventional constant relaxation time in Prony series, two relaxation times that vary exponentially with principal stretch were proposed based on the relaxation test to describe the strain rate effect of the material at low and high strain rate respectively. In addition, using the visco-hyperelastic constitutive model to obtain the model inputs of the Simplified rubber/foam model in LS-DYNA, the impact process of the Metal/PUE composite projectile was reproduced under different impact conditions through the finite element simulation. Simulation results verified the visco-hyperelastic model in generating numerical model material parameters and the rationality of the Simplified rubber/foam model in describing PUEs.

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来源期刊
Polymer Testing
Polymer Testing 工程技术-材料科学:表征与测试
CiteScore
10.70
自引率
5.90%
发文量
328
审稿时长
44 days
期刊介绍: Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.
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