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arXiv 2304.09112cond-mat.mtrl-sci
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各向异性结构化材料方向弹性能的单次测试评估

Single-test evaluation of directional elastic properties of anisotropic structured materials

Jagannadh Boddapati, Moritz Flaschel, Siddhant Kumar, Laura De Lorenzis, Chiara Daraio

AI总结:

针对各向异性结构化材料弹性参数多、传统测试需多次实验的难题,提出基于虚拟场方法的单次拉伸测试识别二维6个刚度张量参数的方法,并用模拟和实验数据验证了准确性。

摘要:

当结构化材料的弹性能呈现方向依赖性时,其描述符的数量会增加。例如,在二维体系中,材料的各向异性行为最多由6个独立的弹性刚度参数描述,而各向同性材料仅需2个。如此多的参数拓展了结构化材料的设计空间,还会引发异常现象,比如材料在单轴压缩下会发生剪切。然而,性能描述符数量的增加,以及剪切变形与法向变形之间的耦合,使得材料性能的实验评估更具挑战性。本文提出了一种基于虚拟场方法的方法论,仅通过一次拉伸试验即可识别二维各向异性结构化材料的6个独立刚度张量参数,从而省去了传统方法通常需要的多次实验。该方法无需应力数据,仅使用全场位移数据和全局力数据。我们通过有限元模拟生成的合成数据,以及增材制造试样的实验数据,验证了该方法的准确性。

英文摘要:

When the elastic properties of structured materials become direction-dependent, the number of their descriptors increases. For example, in two-dimensions, the anisotropic behavior of materials is described by up to 6 independent elastic stiffness parameters, as opposed to only 2 needed for isotropic materials. Such high number of parameters expands the design space of structured materials and leads to unusual phenomena, such as materials that can shear under uniaxial compression. However, an increased number of properties descriptors and the coupling between shear and normal deformations render the experimental evaluation of material properties more challenging. In this paper, we propose a methodology based on the virtual fields method to identify six separate stiffness tensor parameters of two-dimensional anisotropic structured materials using just one tension test, thus eliminating the need for multiple experiments, as it is typical in traditional methods. The approach requires no stress data and uses full-field displacement data and global force data. We show the accuracy of our method using synthetic data generated from finite element simulations as well as experimental data from additively manufactured specimens

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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