八元基结构超材料低周疲劳性能评价研究

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-03-13 DOI:10.1016/j.ijfatigue.2025.108936

Attilio Arcari , Evan P. Strickland , Nicole A. Apetre , John G. Michopoulos

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引用次数: 0

摘要

尽管与固体材料相比，超材料表现出了优越的多物理场响应能力，但设计和部署超材料需要对其耐久性和损伤容忍度进行充分的了解和表征。目前的工作是通过进行疲劳实验研究和确定基于支柱的晶格内的破坏模式和顺序来研究八元基超材料的低周疲劳性能。采用PA2200−聚酰胺12材料，采用选择性激光烧结（SLS）法制备了八极体电池。通过实验测量和比较不同支撑厚度的八轴体试样的疲劳寿命，并将归一化试样有效刚度作为循环的函数进行了比较。柱体破坏的进展表明，在试样的主要中心体积内，柱体的断裂是影响试样疲劳寿命的最显著事件。开发了一种新的可视化技术，以更好地分析测试样品的有限元建模结果，并对具有初始损伤状态的样品进行了附加试验，验证了该方法的有效性。

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On the assessment of low cycle fatigue performance of octet-based structural metamaterial

Although metamaterials have shown their superior multiphysics responses compared to their solid counterparts, designing and deploying them requires that their durability and damage tolerance properties be well understood and characterized. The current work investigates low cycle fatigue properties of octet-based metamaterials by conducting an experimental fatigue study and identifying the failure modes and sequence within the strut-based lattices. A geometry consisting of octet cells was manufactured by selective laser sintering (SLS) using a PA2200 − Polyamide 12 material. The fatigue life was experimentally measured and compared for samples made with octets of different strut thicknesses in terms of the normalized specimen effective stiffness as a function of cycles. The progression of strut failures showed that the breaking of a strut within the main center volume of the sample was the most significant event in the fatigue life of the sample. A novel visualization technique to better analyze the finite element modeling results of the tested samples was developed and additional tests for samples with an initial state of damage demonstrated the validity of the approach.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.