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Material parameters identification and experimental validation of damage models for rubberlike materials

机译:橡胶样材料的材料参数识别和损伤模型的实验验证

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摘要

We test the predictability of our (DPS) microstructure inspired constitutive approach for damage and hysteresis in rubberlike materials by comparing it with the widely adopted Ogden and Roxburgh (OR) and Beatty and Krishnaswamy (BK) models. The experimental validation is analyzed by uniaxial cyclic tests with increasing maximum strains of high damping EPDM rubber specimens adopted in seismic isolation. The numerical identification of the material parameters is obtained by a careful population-based stochastic optimization approach. After testing the stability of our numerical approach, based on a large number of numerical experiments, we deduce that our constitutive model and the OR model are the most accurate. However, differently from our model, we find that the OR model exhibits a strong numerical instability, with a very high variance of the optimal material parameters for the same experimental data sets. We believe that the obtained results are important both for rubber constitutive models and for material parameters optimization approaches. (C) 2016 Elsevier Ltd. All rights reserved.
机译:通过将其与广泛采用的Ogden和Roxburgh(OR)以及Beatty和Krishnaswamy(BK)模型进行比较,我们测试了(DPS)微观结构启发性方法对类橡胶材料的破坏和滞后的可预测性。通过单轴循环试验对实验验证进行了分析,并采用了地震隔离中采用的高阻尼EPDM橡胶样品的最大应变增加的方法。材料参数的数值识别是通过仔细的基于种群的随机优化方法获得的。在通过大量数值实验测试了我们的数值方法的稳定性之后,我们得出本构模型和OR模型是最准确的。但是,与我们的模型不同,我们发现OR模型表现出很强的数值不稳定性,对于相同的实验数据集,最佳材料参数的差异很大。我们认为,获得的结果对于橡胶本构模型和材料参数优化方法都非常重要。 (C)2016 Elsevier Ltd.保留所有权利。

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