Cyclic behavior and constitutive model of high strength low alloy steel plate
Cyclic behavior and constitutive model of high strength low alloy steel plate
复制标题
高强度低合金钢板的循环行为及本构模型
DOI：
10.1016/j.engstruct.2020.110798
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发表时间：
2020-08
影响因子：
5.5
通讯作者：
Hongbo Liu
中科院分区：
文献类型：
--
作者：
Chen Jia;Yongsong Shao;Lanhui Guo;Hongbo Liu
对一种高强度低合金钢进行了不同方案的循环加载试验。根据试验结果，讨论了高强度钢的低周疲劳和极低周疲劳性能，并建立了合适的本构模型。试验结果表明，低周和极循环疲劳破坏呈现出不同的断裂特征。对于低周疲劳，疲劳寿命与应变幅值在对数-对数尺度上呈强负相关。然而，在过渡到低周疲劳时，它们并不符合线性关系。该钢具有明显的循环软化和良好的耗能能力。随着应变幅值的增大，软化度减小，等效阻尼比增大。循环应力-应变曲线符合Ramberg-Osgood模型，强度系数和应变硬化指数均大于低强度钢。建立了描述该钢循环塑性的组合硬化模型，并通过数值模拟验证了该模型的正确性。
Cyclic loading tests with different protocols were conducted for a high strength low alloy steel. Based on the test results, the low cycle fatigue and extremely low cycle fatigue performance of the high strength steel was discussed and an appropriate constitutive model was established. The experimental results implied that the low and extremely cycle fatigue failure showed different fracture features. For low cycle fatigue, there was a strong negative linear correlation between the fatigue life and the strain amplitude in the log–log scale. However, they did not conform the linear relation when transiting to the low cycle fatigue. The steel represented obvious cyclic softening and good energy dissipation capacity. With the increase of strain amplitude, the softening degree decreased and equivalent damping ratio increased. The cyclic stress–strain curve could be descried by the Ramberg-Osgood model, and the strength coefficient and strain hardening exponent of this steel were larger than those of steel with lower strength. A combined hardening model was calibrated to describe the cyclic plasticity of the steel, and it was verified by the simulation results.
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