Verification Examples for Strain and Strain-Rate Determination of Digital Image Correlation Systems
Verification Examples for Strain and Strain-Rate Determination of Digital Image Correlation Systems
复制标题
数字图像相关系统的应变和应变率测定的验证示例
DOI:
10.1007/978-3-319-70563-7_7
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
S. Rodriguez
中科院分区:
文献类型:
--
作者:
Hartmann;S. Rodriguez
Digital Image Correlation techniques (DIC) constitute a growing field of experimental measurement tools to determine the displacement and strain distribution on the surface of a specimen under external mechanical loads. In this article, the aspect of strain computation in surfaces is recapped in a first step. Here, two different approaches are compared. One method is related to the basic ideas emerging in finite elements, while the other approach is frequently applied in commercial DIC-systems. Unfortunately, there are no adequate measures to investigate the accuracy of the strain calculations. This article provides analytical examples concerning strain determination, stretches in arbitrary surface directions, and shear angles. The provided verification examples can be used either to study existing DIC-codes or can be applied by code developers working on new systems. In this regard, the focus will first be on determining strains and strain-rates within a surface. Second, particular surface descriptions are used to investigate examples of homogeneous and inhomogeneous deformations such as simple shear, combined tension-torsion of a cylindrical bar, bending of a thin sheet and a deep-drawing process. It will be shown that some situations show accurate results, while other problems demand special care concerning the interpretation of the final strain field distribution. Thus, the article does not focus on assessing image patterns, but addresses strain determination on point clouds.
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DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
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通讯作者:
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作者:
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DOI:
--
发表时间:
2011
期刊:
影响因子:
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