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arXiv 1802.02768cond-mat.softcond-mat.mtrl-sci
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指数衰减超弹性本构模型及其在粘弹性胶粘剂中的应用

Hyperelastic constitutive modeling with exponential decay and application to a viscoelastic adhesive

Olaf Hesebeck, Andreas Wulf

摘要:

超弹性材料模型是描述弹性体非线性应力-应变关系的理想模型。在本文中,聚氨酯胶粘剂被认为是作为一个示例性的材料,并进行拉伸,压缩和剪切试验。传统的超弹性模型无法令人满意地捕捉到力学行为:如果模型在大应变下与测试结果一致,则它显著低估了低应变下的刚度。我们提出了一个模型扩展来描述一种指数衰减的刚度承担一些类似的一个特定的模型开发的杨。新的超弹性模型与线性粘弹性相结合,以解释被测材料的应变率依赖性。模型参数的确定使用拉伸试验在一个单一的应变速率和蠕变试验。此外,通过比较两种不同高宽比的粘接层对接试验的刚度,确定了粘接层的压缩性。使用这个参数集的新模型提供了一个很好的预测拉伸,压缩和剪切试验在不同的应变率。

英文摘要:

Hyperelastic materials models are well established to describe the non-linear stress-strain relations of elastomers. In this paper, a polyurethane adhesive is considered as an exemplary material and subjected to tensile, compressive and shear tests. Conventional hyperelastic models are unable to capture the mechanical behaviour satisfyingly: If the model agrees with the test results at large strains, it underestimates the stiffness at low strains significantly. We propose a model extension to describe a kind of exponential decay of stiffness which bears some similarity with a specific model developed by Yeoh. The new hyperelastic model is coupled with linear viscoelasticity to account for the strain rate dependence observed for the tested material. The model parameters are identified using a tensile test at a single strain rate only and a creep test. Furthermore, the compressibility is determined by comparison of the stiffness in two butt joint tests with different aspect rations of the adhesive layer. Using this parameter set the new model provides a very good prediction of tensile, compressive and shear tests at different strain rates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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