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首页> 外文会议>SEM Annual Conference and Exposition on Experimental and Applied Mechanics >Identification of Constitutive Parameters Governing the Hyperelastic Response of Rubber by Using Full-Field Measurement and the Virtual Fields Method
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Identification of Constitutive Parameters Governing the Hyperelastic Response of Rubber by Using Full-Field Measurement and the Virtual Fields Method

机译：用全场测量和虚拟字段方法识别控制橡胶的高弹性响应的组成参数

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In this study, the Virtual Fields Method (VFM) is applied to identify constitutive parameters of hyperelastic models from a heterogeneous test. Digital image correlation (DIC) was used to estimate the displacement and strain fields required by the identification procedure. Two different hyperelastic models were considered: the Mooney model and the Ogden model. Applying the VFM to the Mooney model leads to a linear system that involves the hyperelastic parameters thanks to the linearity of the stress with respect to these parameters. In the case of the Ogden model, the stress is a nonlinear function of the hyperelastic parameters and a suitable procedure should be used to determine virtual fields leading to the best identification. This complicates the identification and affects its robustness. This is the reason why the sensitivity-based virtual field approach recently proposed in case of anisotropic plasticity by Marek et al. (Comput Mech 60(3):409-431, 2017) has been successfully implemented to be applied in case of hyperelasticity. Results obtained clearly highlight the benefits of such an inverse identification approach in case of non-linear systems.
机译：在本研究中，应用虚拟字段方法（VFM）以识别来自异构测试的超弹性模型的本构体参数。数字图像相关（DIC）用于估计识别过程所需的位移和应变字段。考虑了两种不同的超弹性模型：门尼模型和奥格登模型。将VFM应用于Mooney模型，导致线性系统，该系统涉及超弹性参数，由于对这些参数的应力的线性度。在OGDDED模型的情况下，应力是超弹性参数的非线性函数，应使用合适的程序来确定导致最佳识别的虚拟字段。这使鉴定使其变得复杂并影响其鲁棒性。这就是Marek等人在各向异性塑性的情况下最近提出的基于灵敏度的虚拟场方法的原因。 （计算机理MECH 60（3）：409-431,2017）已成功实施以在超弹性的情况下应用。在非线性系统的情况下，获得的结果明显突出了这种反向识别方法的益处。

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