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Interactions among phase transition, heat transfer and austenite plasticity in cyclic compression of NiTi shape memory alloys: Effect of loading frequency
Journal of the Mechanics and Physics of Solids ( IF 5.0 ) Pub Date : 2024-07-11 , DOI: 10.1016/j.jmps.2024.105782
Kuo Zhang , Mingpeng Li , Qingping Sun , Lingyun Zhang , Guoan Zhou
Journal of the Mechanics and Physics of Solids ( IF 5.0 ) Pub Date : 2024-07-11 , DOI: 10.1016/j.jmps.2024.105782
Kuo Zhang , Mingpeng Li , Qingping Sun , Lingyun Zhang , Guoan Zhou
Displacement-controlled cyclic compressive responses of polycrystalline superelastic NiTi shape memory alloys (SMAs) are investigated at a maximum strain ε of 4.2 % and over frequencies ranging from 0.0007 Hz to 50 Hz in stagnant air. Our focus was on understanding the interactions among phase transition (PT), heat transfer and plastic flow of austenite phase during cyclic operation. We monitored temperature oscillations along with stress-strain relations and observed a critical frequency , below which the responses were primarily influenced by the frequency-dependent coupling between PT and heat transfer, and above which macroscopic plastic deformation of the austenite phase played an important role in the cycling process, interacting with PT and heat transfer. Such interactions at high frequencies () led to reductions in temperature magnitude, transition strain, latent heat, and hysteresis heat in subsequent cycles, eventually leading to stabilized responses without plastic deformation. Theoretical analysis considering the interactions among PT, heat transfer, and plastic deformation was conducted to interpret and quantify the experimental findings. We find that the initiation and saturation of macroscopic plastic deformation of SMAs due to heat accumulation acted as a negative feedback mechanism in the cyclic responses, preventing the materials from overheating and potential damage in applications.
中文翻译:
NiTi 形状记忆合金循环压缩中相变、传热和奥氏体塑性之间的相互作用:加载频率的影响
在静止空气中,研究了最大应变 ε 为 4.2%、频率范围为 0.0007 Hz 至 50 Hz 的多晶超弹性 NiTi 形状记忆合金 (SMA) 的位移控制循环压缩响应。我们的重点是了解循环运行期间奥氏体相的相变 (PT)、传热和塑性流动之间的相互作用。我们监测温度振荡以及应力-应变关系,并观察到一个临界频率,低于该频率时,响应主要受到 PT 与传热之间的频率相关耦合的影响,高于该频率时,奥氏体相的宏观塑性变形在循环过程,与 PT 和传热相互作用。这种高频相互作用导致后续循环中温度幅度、转变应变、潜热和滞后热的降低,最终导致稳定的响应而没有塑性变形。进行了考虑 PT、传热和塑性变形之间相互作用的理论分析,以解释和量化实验结果。我们发现,由于热量积累而引起的 SMA 宏观塑性变形的引发和饱和在循环响应中起到了负反馈机制的作用,从而防止材料过热和应用中的潜在损坏。
更新日期:2024-07-11
中文翻译:
NiTi 形状记忆合金循环压缩中相变、传热和奥氏体塑性之间的相互作用:加载频率的影响
在静止空气中,研究了最大应变 ε 为 4.2%、频率范围为 0.0007 Hz 至 50 Hz 的多晶超弹性 NiTi 形状记忆合金 (SMA) 的位移控制循环压缩响应。我们的重点是了解循环运行期间奥氏体相的相变 (PT)、传热和塑性流动之间的相互作用。我们监测温度振荡以及应力-应变关系,并观察到一个临界频率,低于该频率时,响应主要受到 PT 与传热之间的频率相关耦合的影响,高于该频率时,奥氏体相的宏观塑性变形在循环过程,与 PT 和传热相互作用。这种高频相互作用导致后续循环中温度幅度、转变应变、潜热和滞后热的降低,最终导致稳定的响应而没有塑性变形。进行了考虑 PT、传热和塑性变形之间相互作用的理论分析,以解释和量化实验结果。我们发现,由于热量积累而引起的 SMA 宏观塑性变形的引发和饱和在循环响应中起到了负反馈机制的作用,从而防止材料过热和应用中的潜在损坏。