Investigation and Compensation of Biaxial Pre-strain During the Standard Nakajima- and Marciniak-test Using Generalized Forming Limit Concept

Investigation and Compensation of Biaxial Pre-strain During the Standard Nakajima- and Marciniak-test Using Generalized Forming Limit Concept
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使用广义成形极限概念进行标准 Nakajima 和 Marciniak 试验期间双轴预应变的研究和补偿

DOI:
10.1016/j.proeng.2017.10.1022
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发表时间:
2017
期刊:
Procedia Engineering
影响因子:
--
通讯作者:
Christian
Christian
中科院分区:
--
文献类型:
--
作者:
Wolfram;Christian

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板料成形性预测是板料成形过程中的一项重要任务。在工业应用中,韧性断裂的通用标准是所谓的成形极限曲线(FLC)的评估。FLC的测定在国际标准12004-2中通过两种不同的实验方法Marciniak-和Nakajima-测试进行标准化。一些效应,例如弯曲或接触压力,导致双轴预成形和轻微的非线性载荷路径。这导致FLC的不准确性。广义成形极限概念(GFLC)是一种用于预测非线性载荷路径下局部颈缩的唯象方法。GFLC的准确性和鲁棒性已经在几篇论文中得到了证明。在这项研究中,GFLC被用来补偿双轴预成形和计算线性FLC。输入参数为材料HC 340 LA的Marciniak和Nakajima-FLC。
One of the most important tasks in sheet metal forming is the prediction of formability. The common criterion for ductile fracture in industrial application is the evaluation of the so-called Forming Limit Curve (FLC). The determination of FLCs is standardized in the international standard 12004-2 by two different experimental methods, the Marciniak- and the Nakajima-test. Several effects, for example bending or contact pressure, are leading to biaxial pre-forming and to a slightly non-linear load path. This results in inaccuracies of the FLC. The so-called Generalized Forming Limit Concept (GFLC) is a phenomenological approach, which was introduced to predict the local necking of non-linear load paths. The accuracy and robustness of the GFLC has already been shown in several papers. In this investigation the GFLC was used to compensate the biaxial pre-forming and to calculate a linear FLC. Input parameters are the Marciniak- and Nakajima-FLCs of the material HC340LA.
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