NiTi形状记忆合金线圈弹的热力学表征和建模
Jesús G Puente-Córdova1, Flor Y Rentería-Baltiérrez2, José M Diabb-Zavala1
1Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Av. Universidad s/n Cd. Universitaria, San Nicolás de los Garza 66455, Mexico.
Materials (Basel, Switzerland)
|May 27, 2023
概括
这项研究研究了- (NiTi) 形状记忆合金 (SMA) 线圈弹的热力学行为. 分数计算模型有效地描述了NiTi SMAs在不同阶段的原子移动性和粘弹性反应.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 物理 物理学 物理
背景情况:
- 形状记忆合金 (SMA),特别是NiTi,在各种科学和工程应用中至关重要.
- 了解NiTi SMA线圈弹的热力学行为对于优化其性能至关重要.
- 现有的模型可能无法完全捕捉SMA的复杂粘弹性反应和原子移动性.
研究的目的:
- 在不同电流强度下描述NiTi SMA线圈弹的热力学行为.
- 评估NiTi SMAs的粘弹性特性和减压能力.
- 用微积分计算解释观察到的行为,并将其与现象学模型进行比较.
主要方法:
- 在NiTi SMA卷轴弹上进行了机械加载-卸载测试,电流从0到2.5A.
- 动力机械分析 (DMA) 用于确定复杂弹性模量 (E*) 和阻尼能力 (tan δ).
- 分数泽纳模型 (FZM) 和一个拟议的现象学模型被用于数据解释.
主要成果:
- 该研究确定了NiTi SMA的最大阻尼能力 (tan δ) 在70°C左右.
- 从FZM中得出的分数顺序与马氏体和奥氏体相中的原子移动性相关.
- FZM为理解NiTi SMAs的温度依赖储存模块 (E') 提供了一个框架.
结论:
- 分数计算,特别是FZM,提供了一种强大的方法来分析NiTi SMA的热力学行为和原子移动性.
- 这项研究成功地描述了NiTi SMA线圈弹的粘弹性反应和阻尼性能.
- 与现象学模型的比较凸显了微积分计算在描述 SMA 行为的有效性.
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