FEA-based development of a new tool for systematic experimental validation of nonlinear strain paths and design of test specimens
FEA-based development of a new tool for systematic experimental validation of nonlinear strain paths and design of test specimens
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基于有限元分析的新工具的开发，用于非线性应变路径的系统实验验证和测试样本的设计
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发表时间：
2017
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通讯作者：
W. Volk
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作者：
A. Weinschenk;W. Volk
为了在有限元模拟中实现高精度，对非线性应变路径的成形极限曲线（FLC）进行建模是有益的，因为基于线性应变路径的FLC不能准确地预测经历非线性应变路径的零件的失效。标准化的Nakajima或Marciniak测试用于创建线性应变路径的FLC。对于常见的应变路径，试样的形状是众所周知的。只有有限的一组非线性应变路径可以通过使用这些测试产生。例如，可以产生双轴应变路径，然后可以切割试样以产生单轴应变路径。然而，反过来是不可能的。因此，开发一种能够系统地研究各种非线性应变路径的新工具是非常重要的。本文介绍了一种新开发的拉深工具，表现出这些属性。对于任何应变状态，都可以生成中心应变均匀的大型试样。这些标本是足够大的，以…
To achieve high accuracy in finite element simulation, it is beneficial to model forming limit curves (FLCs) for nonlinear strain paths, since FLCs based on linear strain paths inaccurately predict the failure of parts that undergo nonlinear strain paths. Standardized Nakajima or Marciniak tests are used to create a FLC for linear strain paths. For common strain paths, the shapes of the specimens are well-known. Only a limited set of nonlinear strain paths can be generated by using these tests. For example, a biaxial strain path can be generated, and then the test specimen can be cut to generate a uniaxial strain path. However, the other way around is not possible. Therefore, it is important to develop a new tool that can systematically investigate all kinds of nonlinear strain paths. This paper describes a newly developed deep drawing tool that exhibits these properties. Large specimens with homogeneous strain in the centre can be generated for any strain state. These specimens are sufficiently large tha...