Enhancing load-bearing in lattice structures via core-modified designs with secondary hardening

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-06-08 DOI:10.1016/j.ijmecsci.2025.110484

Liming Huang , Jiafei Pang , Quanfeng Han , Jianxiang Wang , Xin Yi

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引用次数: 0

Abstract

The mechanical performance of singly oriented lattice structures is often compromised by strength degradation caused by the evolution of local deformation bands. To address this challenge, a novel structural design strategy is proposed that utilizes a secondary hardening response to suppress the propagation of local shear bands in lattice structures. Fabricated via selective laser melting with 316L stainless steel, these structures are evaluated combining experimental and finite element analysis. Results reveal that core-modified lattice structures exhibit remarkable secondary hardening under large compressive deformation, delaying the propagation of local deformation bands through multi-step deformation and self-strengthening of the modified cores. Unit cell simulations confirm that the novel design enhances elastic modulus while reducing elastic anisotropy. Geometric parameter analysis demonstrates that plastic plateau and secondary hardening stages can be tailored by adjusting geometric features. The deformation mechanism analysis further attributes the secondary hardening response to the spatial distribution of plastic hinges, providing insights for advanced structural design.

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通过二次硬化的核心改进设计增强晶格结构的承重

单取向晶格结构的力学性能往往受到局部变形带演化引起的强度退化的影响。为了解决这一挑战，提出了一种新的结构设计策略，利用二次硬化响应来抑制晶格结构中局部剪切带的传播。采用选择性激光熔化316L不锈钢，结合实验和有限元分析对这些结构进行了评价。结果表明：在大压缩变形条件下，核改性晶格结构表现出明显的二次硬化，通过多步变形延缓了局部变形带的扩展，并实现了核改性的自强化；单元胞模拟证实了新设计在降低弹性各向异性的同时提高了弹性模量。几何参数分析表明，可以通过调整几何特征来定制塑性平台和二次硬化阶段。变形机理分析进一步将二次硬化响应归因于塑性铰的空间分布，为结构的高级设计提供参考。

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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来源期刊

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.