Identification of the Mechanical Properties of High-Strength Steel Using Digital Image Correlation
Identification of the Mechanical Properties of High-Strength Steel Using Digital Image Correlation
复制标题
利用数字图像相关识别高强度钢的力学性能
DOI：
10.4028/www.scientific.net/amr.980.122
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Losertová
中科院分区：
文献类型：
--
作者：
M. Štamborská;M. Kvíčala;M. Losertová
基于数字图像相关的高强度钢力学性能识别。本文介绍了一种利用全场测量来确定金属板材在大应变下的塑性行为的实验方法。试验是在缺口试样上进行的。这种几何形状产生了一个不均匀的应变场，在测试过程中使用数字图像相关系统进行测量。在识别过程中使用非均匀应变场的优点是可以同时分析复杂的应力-应变状态，并且可以在一次测试中获得更多的信息。另一方面，应力场不能直接从试验中计算出来，必须开发一个合适的识别程序。在这里，适用于大应变和塑性的虚拟场方法（VFM）被用来识别材料的硬化行为和各向异性。与VFM获得的值进行了比较，从一个标准的识别使用单轴拉伸试验的结果。
Identification of the mechanical properties of high-strength steel using digital image correlation. In this paper an experimental procedure to identify the plastic behaviour of sheet metals up to large strains using full field measurement is presented. The tests were conducted on notched specimens. This geometry generates a heterogeneous strain field which was measured during the test using a digital image correlation system. The advantage of using a heterogeneous strain field in the identification procedure is that a complex state of stress-strain can be analyzed at the same time and much more information can be obtained in a single test. On the other hand, the stress field cannot be directly computed from the test and a suitable identification procedure must be developed. Here, the virtual fields method (VFM) adapted for large strains and plasticity was used to identify the hardening behaviour and the anisotropy of the material. The values obtained with the VFM were compared with the results from a standard identification made using uniaxial tensile tests.