【摘要】 通过对常温下的NiTi形状记忆合金丝进行拉伸试验,研究这种形状记忆合金材料的超弹性能力和加卸载循环下的耗能能力。根据试验结果分析应变幅值、加载频率和循环次数对这种记忆合金材料在奥氏体状态下加卸载循环时的等效刚度、单位循环的耗能能力和等效阻尼比的影响,并对三个特征参数随工作温度变化的规律进行了理论分析,为形状记忆合金阻尼器在工程结构中的应用奠定基础。更多还原

【Abstract】 The tensile test of NiTi shape memory alloy (SMA) wires was completed on the super-elasticity behavior and energy dissipation capacity in circular loading of specimens at normal temperature. The influences of strain amplitude, loading frequency, as well as number of cycles on working performance, such as equivalent stiffness, energy dissipation per circles and equivalent damping ratio of the SMA wire in austenitic state are analyzed based on the experimental results,and the change rules of these three character parameters at different temperature are analyzed. The study provides a basis for the SMA damper to apply in structure engineering.更多还原