Meshless Methods for Full Field Displacement and Strain Measurement
Meshless Methods for Full Field Displacement and Strain Measurement
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用于全场位移和应变测量的无网格方法
DOI：
10.1115/1.860328_ch5
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Michopoulos
中科院分区：
文献类型：
--
作者：
A. Iliopoulos;J. Michopoulos
在过去的十年里，全场测量方法已经成为实验力学和其他技术学科的一个非常有用的工具。随着数码成像技术的快速发展，数码相机向更高质量、更廉价的方向发展，以及可用计算能力的不断提高，这些方法已被更广泛的科学实验室所采用。我们对全场测量的无网格方法的持续发展感兴趣，是因为需要通过海军研究实验室(NRL)开发的多轴机电系统将其改进、推广并集成到数据驱动的复合材料表征方法中。这种方法既需要测量平面内应变场，也需要测量平面外应变场，因此这种方法对此特别有吸引力。此外，在实验力学和其他技术领域中，全场位移和应变的测量非常重要，这为无网格近似格式的使用提供了一个独特的机会。在工程应用中，传统的近似方法涉及到使用与典型网格相对应的离散单元来表示场变量分布。更具体地说，底层几何体被细分为许多简单几何体的子区域，通常是三角形或四边形的形状。可以基于假设的各个元素的形状函数来计算这些子区域或元素内的感兴趣的场量的值。
Over the last decade, full field measurement methods have become a very useful tool for experimental mechanics and other technical disciplines. The rapid evolution of digital imaging, that has materialized toward higher quality, more inexpensive digital cameras, and the increase in the available computational power, have made these methods accessible to a broader range of scientific laboratories.Our interest in the continuing development of meshless methods for full field measurements originates from the need to improve, generalize and integrate them into the data-driven composite material characterization methodology via multi-axial mechatronic systems that were developed by the Naval Research Laboratory (NRL). This methodology requires the measurement of both in-plane and out-of-plane strain fields, and therefore such methods are particularly attractive for this purpose. In addition, there is a large variety of applications in the area of experimental mechanics and other technical disciplines where the whole field displacement and strain measurement is very important, and consequently provide a unique opportunity for the usage of the meshless approximation schemes. In engineering applications traditional approximation schemes involve the use of discrete elements corresponding to typical meshes for representing field variable distributions. More specifically, the underlying geometry is subdivided into a number of sub-regions of simple geometry, usually in the shape of a triangle or quadrilateral. The values of the field quantities of interest within these subregions or elements can be calculated based on assumed shape functions of the respective elements.