LYP160级钢单调及循环加载性能试验

发布时间：2018-07-09 12:00

本文选题：桥梁工程 + 滞回性能　；参考：《中国公路学报》2017年03期

【摘要】：为探讨国产LYP160级钢单调及循环加载下的力学性能,对12个LYP160级钢试件进行单调加载试验和多种加载制度下的循环加载试验,分析其单调加载力学性能、本构关系及循环加载应力-应变特性;并基于Ramberg-Osgood模型拟合了不同循环加载制度下LYP160级钢的应力增量-应变增量关系曲线。研究结果表明:LYP160级钢具有良好的塑性变形能力和滞回性能,不同循环加载制度下的应力-应变曲线饱满;其循环加载应力-应变曲线与单调加载应力-应变曲线差异明显,循环加载应变幅值、加载历史对其循环应力-应变曲线影响显著;若循环加载应变幅小于LYP160级钢的强化初始应变,则循环硬化现象不明显,若循环加载应变幅大于LYP160级钢的强化初始应变,则循环硬化现象非常明显;基于Ramberg-Osgood模型能较好地模拟各循环加载制度下的应力增量-应变增量曲线,应变幅逐级增大的加载制度下各应力增量-应变增量曲线较为接近,而应变幅逐级减小的加载制度下应力增量-应变增量曲线与其他加载制度下的应力增量-应变增量曲线差异较大。
[Abstract]:In order to study the mechanical properties of domestic LYP160 steel under monotone and cyclic loading, 12 specimens of LYP160 grade steel were subjected to monotone loading test and cyclic loading test under various loading systems. The mechanical properties of 12 LYP160 steel specimens under monotone loading were analyzed. Based on the Ramberg-Osgood model, the stress-strain increment curves of LYP160 grade steel under different cyclic loading conditions are fitted. The results show that the weight LYP160 grade steel has good plastic deformation ability and hysteretic property, the stress-strain curve under different cyclic loading conditions is full, and the stress-strain curve of cyclic loading is obviously different from that of monotonic loading. The cyclic strain amplitude and loading history have a significant effect on the cyclic stress-strain curve, and if the cyclic strain amplitude is less than the initial strain of LYP160 grade steel, the cyclic hardening phenomenon is not obvious. If the cyclic strain amplitude is larger than the initial strain of LYP160 grade steel, the cyclic hardening phenomenon is very obvious, and the Ramberg-Osgood model can well simulate the stress-strain increment curves under different cyclic loading conditions. The increment curves of stress and strain are close to each other under the loading system of increasing the strain amplitude step by step. However, the increment curve of stress increment and strain is different from that of other loading systems in the loading system where the amplitude should be reduced step by step.
【作者单位】：同济大学桥梁工程系;鞍山钢铁集团公司;
【基金】：国家自然科学基金项目(51578460)
【分类号】：U444

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