Coupling digital image correlation and finite element analysis to determine constitutive parameters in necking tensile specimens
Coupling digital image correlation and finite element analysis to determine constitutive parameters in necking tensile specimens
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DOI：
10.1016/j.ijsolstr.2016.06.038
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发表时间：
2016-10
影响因子：
3.6
通讯作者：
Daniel Gerbig;A. Bower;Vesna Savic;L. Hector
中科院分区：
文献类型：
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作者：
Daniel Gerbig;A. Bower;Vesna Savic;L. Hector
一个一般的框架，耦合数字图像相关（DIC）与有限元分析，以确定材料参数的测量不均匀的位移场在一个标本。该方法是通过反复校正所选本构模型中的材料参数，使测量和计算的位移场和施加到试样上的外力之间的差异最小化。最小化可以解析地完成，并且使用自然地与标准非线性有限元计算集成的Newton-Raphson过程来求解所得到的非线性方程组。作为一个代表性的应用，该方法被应用于测量拉伸试样超过均匀伸长率的流动行为。对锥形HSLA 590 FB钢试样进行的一系列拉伸试验结果表明，有效应力-应变行为可以可靠地提取到60%的应变，远远超过了传统的直规试样工程分析通常达到的20%的限制。
A general framework is described for coupling digital image correlation (DIC) with finite element analysis to determine material parameters from measurements of nonuniform displacement fields in a specimen. The approach is to minimize the difference between measured and computed displacement fields and external forces applied to the specimen by repeatedly correcting the material parameters in a chosen constitutive model. The minimization can be accomplished analytically, and the resulting nonlinear system of equations solved using a Newton–Raphson procedure that integrates naturally with standard nonlinear finite element computations. As a representative application, the method is applied to measure the flow behavior of tensile specimens beyond uniform elongation. The results of a series of tensile tests on tapered HSLA 590FB steel specimens show that the effective stress-strain behavior can reliably be extracted to a strain of 60%, well beyond the limits of 20% commonly achieved using traditional engineering analyses on straight-gauge specimens.