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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。
In order to investigate the mechanical properties of domestic LYP160 steel under monotonous and cyclic loading, 12 LYP160 steel specimens were subjected to monotonous loading test and cyclic loading test under various loading conditions, and their monotonous loading mechanical properties, constitutive relation and cycle The stress-strain characteristics of LYP160 steel under different cyclic loading conditions were fitted based on the Ramberg-Osgood model. The results show that: LYP160 steel has good plastic deformation capacity and hysteretic performance under different cyclic loading system stress-strain curve full; cyclic loading stress - strain curve and monotonous loading stress - strain curve significantly different, cyclic loading strain Amplitude and loading history have significant effects on the cyclic stress-strain curve. If the cyclic loading-strain curve is smaller than that of LYP160 grade steel, the cyclic hardening phenomenon is not obvious. If the cyclic loading strain amplitude is larger than the initial strain of LYP160 grade steel, The cycle hardening phenomenon is very obvious. Based on the Ramberg-Osgood model, the stress increment-strain increment curve under each cyclic loading system can be well simulated, and the stress increment-strain increment under the loading system with stepwise increase of strain amplitude The curve is close, but the stress increment-strain increment curve under the loading system with stepwise decreasing amplitude varies greatly from the stress increment-strain increment curve under other loading conditions.