Three-stage full-range stress-strain model for stainless steels
Three-stage full-range stress-strain model for stainless steels
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DOI：
10.1061/(asce)0733-9445(2008)134:9(1518
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发表时间：
2008-09-01
期刊：
影响因子：
--
通讯作者：
Chung, K. F.
中科院分区：
文献类型：
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作者：
Quach, W. M.;Teng, J. G.;Chung, K. F.
冷弯不锈钢构件的高级数值模拟，从制造到在外加载荷下的全范围响应，需要了解材料在广泛的拉伸和压缩应变范围内的应力-应变关系。虽然已经为不锈钢发展了许多应力-应变模型，但它们只能在有限的应变范围内或仅对拉伸应力-应变行为进行准确预测。本文提出了不锈钢的三阶段应力-应变模型，该模型能够准确地预测拉应变和压应变的全范围。新的应力-应变模型是使用三个基本的Ramberg-OsGood参数定义的，并基于对现有实验数据的仔细解释。通过与实验应力-应变曲线的比较，验证了该模型的准确性。这些比较也清楚地证明了所提出的模型相对于现有的唯一的全域应力-应变模型的优势。
Advanced numerical modeling of cold-formed stainless steel members, from manufacturing to full-range response under applied loading, requires knowledge of the stress-strain relationship of the material over a wide range of tensile and compressive strains. Although a number of stress-strain models have been developed for stainless steels, they are only capable of accurate predictions either over a limited strain range or for the tensile stress-strain behavior only. This paper presents a three-stage stress-strain model for stainless steels, which is capable of accurate predictions over the full ranges of both tensile and compressive strains. The new stress-strain model is defined using the three basic Ramberg-Osgood parameters and is based on a careful interpretation of existing experimental data. The accuracy of the proposed model is demonstrated by comparing its predictions with experimental stress-strain curves. These comparisons also clearly demonstrate the advantage of the proposed model over the only existing full-range stress-strain model.