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Influence of Discontinuous Yielding on Normal Anisotropy (R-Value) Measurements

机译：间断屈服对法向各向异性（R值）测量的影响

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摘要

Accurate assessment of plastic anisotropy is essential to many material models used in computer-aided sheet metal forming simulations. In this analysis, the influence of discontinuous yielding (yield point elongation or YPE) on normal anisotropy (R-value} measurements was examined. A laboratory-annealed, non temper-rolled, aluminum-killed drawing quality (AKDQ) steel was considered. It was found that discontinuous yielding significantly influences R-value calculations by imposing an effective offset to the width strain measurement during a sheet tensile test if the R-value is defined in terms of total strains (R = epsilon w/epsilon ). The effect may be positive or negative and shows considerable variability between tests. For a more accurate and consistent representation of normal anisotropy, the incremental R-value (R' = epsilon w/epsilon) should be used in eases of significant YPE. A procedure has been developed to account for the low-strain effects of discontinuous yielding on plastic anisotropy measurements, where the R'-value is determined in a region of stable, uniform deformation on the stress/strain curve. For adequately temper rolled materials (with minimal YPE) and for inherently YPE-free materials, the R-value may be determined in the conventional way.
机译：塑性各向异性的准确评估对于计算机辅助钣金成形模拟中使用的许多材料模型至关重要。在此分析中，研究了不连续屈服（屈服点伸长率或YPE）对正常各向异性（R值）测量值的影响，并考虑了实验室退火的，非回火轧制的铝镇静拉拔质量（AKDQ）钢。结果发现，如果以总应变（R = epsilon w / epsilon）来定义R值，则不连续屈服会通过在薄板拉伸试验期间对宽度应变测量施加有效偏移来显着影响R值的计算。可能是正值也可能是负值，并且在两次测试之间表现出相当大的差异性为了更准确，一致地表示正常各向异性，应使用增量R值（R'= epsilon w / epsilon）来缓解明显的YPE。为解决不连续屈服对塑性各向异性测量的低应变影响而开发的问题，其中R'值是在应力/应变曲线上稳定，均匀变形的区域中确定的。充分回火轧制的材料（具有最小的YPE），对于固有无YPE的材料，R值可以按常规方法确定。

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