Scholarlink

<p>Stretching-dominated lattice metamaterials offer exceptional stiffness-to-weight efficiency, but their physical realisation via material extrusion additive manufacturing (MEX-AM) is fundamentally constrained by process-induced defects. This study investigates these process-structure interactions by evaluating Isomax (cubic + octet) architectures. An initial simulation-led framework evaluated Isomax against Kagome topologies, leading to the exclusion of the buckling-prone Kagome from physical testing. Closed-cell Isomax specimens were subsequently fabricated in PLA and evaluated under tension, flexure, and compression. Mechanical testing revealed severe performance asymmetry. Tensile and flexural strengths degraded by &gt; 60% and ~ 74%, respectively, versus solid controls. Fractography suggests this penalty is associated with Nodal Toolpath Fragmentation (NTF), a slicer-induced discretization of the extrusion path at structural intersections that forces premature, interface-dominated failure. Conversely, compression physically suppresses NTF via contact stabilisation. This yields near-isotropic behaviour, with orientation-dependent strength varying by only 1.4%, and limits the compressive manufacturing penalty to 14% relative to numerical baselines. This confirms geometry dictates compressive performance, while process defects govern tension. Deploying Maxwell-stable metamaterials requires process-aware design prioritising toolpath continuity. By isolating these bottlenecks, this work supports UN Sustainable Development Goals 9 and 12, optimising material efficiency for load-bearing structures.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Process-structure interactions in stretching-dominated lattices: how nodal toolpath fragmentation limits geometric isotropy in MEX-AM

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月19日

查看全文
  • Faizaan Mirza,
  • Satish Shenoy Baloor,
  • Srinivas Nunna,
  • Chandrakant Ramanath Kini,
  • Claudia Creighton

摘要

Stretching-dominated lattice metamaterials offer exceptional stiffness-to-weight efficiency, but their physical realisation via material extrusion additive manufacturing (MEX-AM) is fundamentally constrained by process-induced defects. This study investigates these process-structure interactions by evaluating Isomax (cubic + octet) architectures. An initial simulation-led framework evaluated Isomax against Kagome topologies, leading to the exclusion of the buckling-prone Kagome from physical testing. Closed-cell Isomax specimens were subsequently fabricated in PLA and evaluated under tension, flexure, and compression. Mechanical testing revealed severe performance asymmetry. Tensile and flexural strengths degraded by > 60% and ~ 74%, respectively, versus solid controls. Fractography suggests this penalty is associated with Nodal Toolpath Fragmentation (NTF), a slicer-induced discretization of the extrusion path at structural intersections that forces premature, interface-dominated failure. Conversely, compression physically suppresses NTF via contact stabilisation. This yields near-isotropic behaviour, with orientation-dependent strength varying by only 1.4%, and limits the compressive manufacturing penalty to 14% relative to numerical baselines. This confirms geometry dictates compressive performance, while process defects govern tension. Deploying Maxwell-stable metamaterials requires process-aware design prioritising toolpath continuity. By isolating these bottlenecks, this work supports UN Sustainable Development Goals 9 and 12, optimising material efficiency for load-bearing structures.

Graphical Abstract