Inverse methods have been used for decades to identify material properties, in parallel, or as a substitution for direct methods. Although it has proven a useful method for many types of materials and simple geometrical shapes, it has barely been used on complex shape parts. This is the main objective of the non-destructive method proposed in this study. The proposed inverse approach, based on both vibrational experiment data and Finite Element Model Updating (FEMU), is successfully applied to a violin soundboard made of flax-epoxy composite. Results show that, by minimizing the discrepancy between the experimental and numerical data, three rigidities and three loss factors can be determined simultaneously. The identified values of the constitutive elastic moduli and longitudinal loss factor are in agreement with those determined using quasi-static tests and dynamic mechanical analysis.

数十年来，逆方法已被用于并行或替代直接方法来识别材料属性。尽管已证明该方法可用于多种类型的材料和简单的几何形状，但几乎没有用于复杂形状的零件。这是本研究中提出的非破坏性方法的主要目标。所提出的基于振动实验数据和有限元模型更新（FEMU）的反向方法已成功应用于亚麻-环氧树脂复合材料制成的小提琴共鸣板。结果表明，通过最小化实验数据与数值数据之间的差异，可以同时确定三个刚度和三个损耗因子。