Novel Class of Additive Manufactured NiTi-Based Hierarchically Graded Chiral Structure with Low-force Compressive Actuation for Elastocaloric Heat Pumps

Xin Peng , Luhao Yuan , Donghua Dai , Yu Liu , Dongya Li , Dehui Zhu , Ziyu Fang , Chenglong Ma , Dongdong Gu , Meiping Wu
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引用次数: 1

Abstract

Elastocaloric refrigeration is the most promising green solid-state refrigeration technology to replace conventional vapor compression refrigeration. The development direction of the elastocaloric component that acts as a key part of the elastocaloric refrigeration system contains a large elastocaloric effect, low stress hysteresis, high heat exchange performance, and small driving loads. The first two indices can be realized by material modification; however, the last two are more dependent on a novel porous structure design. However, the conventional porous structure is confronted with some critical challenges, including inhomogeneous stress, a significant hysteresis area, and deformation instability under the alternating cyclic loading. In this study, a NiTi-based elastocaloric structure model with chirality feature and gradient design as innovative elements was presented, bio-inspired by the structure of the plant tendrils. A quantitative optimization for the NiTi-based elastocaloric structure was performed using the finite element analysis (FEA) method. Strain and martensite volume fraction (MVF) fields during the loading and unloading processes were predicted and evaluated. The simulated results indicated that increasing the thickness gradient g1 of the strip or decreasing the diameter gradient g2 of the structure was beneficial to achieving more homogeneous strain and martensite distribution, simultaneously with higher energy storage efficiency and specific surface area. In addition, these NiTi-based chiral structures with different structural parameters were fabricated by laser powder bed fusion (LPBF). At the optimized structure parameters of g1 = 2 and g2 = 1.11, the LPBF-fabricated NiTi-based chiral structure could achieve an adiabatic temperature change ΔTad of 2.3 K, driving force of as low as 149.11 N, and |ΔTad/F| of as high as 15.42 K/kN at a recoverable compressive strain of 10%.

一种用于弹性热油泵的低力压缩驱动的新型增材制造镍基分层梯度手性结构
弹性热制冷是最有希望取代传统蒸汽压缩制冷的绿色固态制冷技术。作为弹热制冷系统关键部件的弹热元件的发展方向包括大的弹热效应、低应力滞后、高的热交换性能和小的驱动负载。前两个指标可以通过材料改性来实现;然而,后两者更多地依赖于一种新颖的多孔结构设计。然而,传统的多孔结构面临着一些关键的挑战,包括不均匀的应力、显著的滞后区以及在交变循环载荷下的变形不稳定性。在本研究中,以植物卷须的结构为生物灵感,提出了一种以手性特征和梯度设计为创新元素的基于NiTi的弹热结构模型。使用有限元分析(FEA)方法对NiTi基弹热结构进行了定量优化。对加载和卸载过程中的应变场和马氏体体积分数场进行了预测和评价。模拟结果表明,增大带材的厚度梯度g1或减小组织的直径梯度g2有利于获得更均匀的应变和马氏体分布,同时具有更高的储能效率和比表面积。此外,通过激光粉末床融合(LPBF)制备了这些具有不同结构参数的NiTi基手性结构。在g1=2和g2=1.11的优化结构参数下,LPBF制备的NiTi基手性结构在10%的可恢复压缩应变下可实现2.3K的绝热温度变化ΔTad,低至149.11N的驱动力和高达15.42K/kN的|ΔTad/F|。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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