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基于应变的应变硬化指数演化行为研究

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为准确描述变形过程中双相高强钢板的应力应变关系,针对 3 种双相高强钢板应变硬化指数的演化行为进行了试验研究与理论模型预测.借助单向拉伸试验机和自主研发的DIC应变测量系统,获得了 3 种材料的真实应力-真实应变曲线,基于经典的Hollomon流动应力模型,得到了其应变硬化指数的演化历程,发现 3 种材料应变硬化指数与真实应变呈非线性变化关系.为了更好地预测应变硬化指数的演化行为,提出了可以描述其值变化的非线性数学模型,并结合经典的Hollomon流动应力模型,提出了基于n值变化的修正的Hollomon-n流动应力模型,最后通过 3 种材料的真实应力-真实应变曲线验证了所提出模型的有效性.
Research on evolution behavior of strain hardening exponent based on strain
To accurately describe the stress and strain relationship of dual-phase(DP)high-strength steel sheet during deformation,the evolution behavior of strain hardening exponent of three kinds of dual-phase high-strength steel sheets was investigated experimentally and predicted by theoretical models.The true stress-true strain curves of three kinds of materials were obtained using unidirectional tensile tes-ting machine and self-developed DIC strain measurement system.The variation history of strain hardening exponent was obtained based on the classical Hollomon flow stress model.It is found that the strain hardening exponents of three kinds of materials chang nonlinearly with the true strain.To better predict the evolution behavior of strain hardening exponent,the nonlinear mathematical model that can describe the change of its value was proposed.Combined with the classical Hollomon flow stress model,the modified Hollomon-n flow stress model based on the change of n value was proposed.Finally,the validity of the proposed model was verified by the true stress-true strain curves of three kinds of materials.

dual-phase high-strength steel sheetstrain hardening exponentdigital image correlation methodstrain evolutionflow stress model

崔学习、关铂镔、周兵营、吴向东、万敏、韩非

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北京航天试验技术研究所,北京 100074

中国运载火箭技术研究院 空间物理重点实验室,北京 100076

北京航空航天大学 机械工程及自动化学院,北京 100191

宝山钢铁股份有限公司 中央研究院,上海 201900

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双相高强钢板 应变硬化指数 数字图像相关法 应变演化 流动应力模型

国家自然科学基金资助项目航天六院创新中心发展基金资助项目汽车用钢开发与应用技术国家重点实验室项目

518750272023Tm.YY5354Sd2021090602

2024

10.3969/j.issn.1007-2012.2024.08.020

塑性工程学报
中国机械工程学会

塑性工程学报

CSTPCD北大核心
影响因子：0.46
ISSN：1007-2012
年,卷(期)：2024.31(8)
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