Computing strain fields from discrete displacement fields in 2D-solids
Computing strain fields from discrete displacement fields in 2D-solids
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DOI：
10.1016/0020-7683(95)00240-5
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发表时间：
1996-12-01
影响因子：
3.6
通讯作者：
Brekelmans, WAM
中科院分区：
文献类型：
--
作者：
Geers, MGD;DeBorst, R;Brekelmans, WAM
材料的应变局部化和损伤演化分析需要适当的实验技术来验证材料在损伤区的复杂行为。现代技术现在可以测量材料小区域的位移场，需要一个补充的程序来推导伴随的应变场。局部应变场的知识提供了有关应用本构模型的直接信息，并作为大多数参数估计过程的初始输入，而模型参数的微调应通过比较计算和测量的位移场来完成。本研究提出了一种从一组离散点的位移计算应变的理论，在实验测量位移场的后处理中特别有用。对理论进行了充分阐述，并给出了一些实例。与一些解析解进行了比较，并评价了噪声对输入数据的影响。版权所有爱思唯尔科学有限公司
The analysis of strain localization and damage evolution in materials requires appropriate experimental techniques to verify the complex material behaviour in the damaging zone. Modern techniques are now available to measure the displacement fields in small zones of a material, and a complementary procedure is needed to derive the accompanying strain fields. The knowledge of the local strain fields gives direct information with respect to the applied constitutive model and serves as initial input for most parameter estimation procedures, while the fine-tuning of the model parameters should be done by comparing the computed and measured displacement fields. This study presents a theory to compute strains from the displacements in a discrete set of points and is particularly useful in the post-processing of experimentally measured displacement fields. The theory is fully elaborated, and some practical examples are given. A comparison is made with some analytical solutions, and the effect of noise on the input data is evaluated. Copyright (C) 1996 Elsevier Science Ltd.