Standard material parameters identification strategies for constitutive equations generally use an extensive number of classical tests for collecting the required experimental data. Recently, new specimen geometries for heterogeneous tests were designed to enhance the richness of the strain field and capture supplementary strain states using full‐field measurement techniques. The butterfly specimen is an example of such a geometry, designed through a numerical optimization procedure where an indicator capable of evaluating the heterogeneity and the richness of strain information is used. The aim of this work is to experimentally validate the heterogeneous butterfly mechanical test in the parameter identification framework. Blanks of mild steel DC04 are cut with the butterfly geometry, and specific grips are designed. Tests are performed with Digital Image Correlation technique, and a Finite Element Model Update inverse strategy is used for the parameter identification, as well as the calculation of the indicator. The identification strategy is accomplished with the data obtained from the experimental tests, and the results are compared with quasi‐homogeneous tests.

中文翻译：

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异构力学测试的设计：数值方法和实验验证

用于本构方程的标准材料参数识别策略通常使用大量经典测试来收集所需的实验数据。最近，设计了用于异构测试的新样品几何形状，以增强应变场的丰富性并使用全场测量技术捕获补充应变状态。蝶形样品就是这种几何形状的一个例子，它是通过数值优化程序设计的，其中使用了一种能够评估应变信息异质性和丰富性的指标。这项工作的目的是在参数识别框架中通过实验验证异构蝶形机械测试。低碳钢DC04的毛坯按照蝴蝶的几何形状切割，并设计了特殊的握把。使用数字图像相关技术进行测试，并使用有限元模型更新逆策略进行参数识别以及指标的计算。通过从实验测试中获得的数据来完成识别策略，并将结果与​​准均质测试进行比较。