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<p>Four lattice structures with different rounded corner sizes were designed and prepared, and the effects of nodal rounded corner sizes on the compressive properties of laser powder bed melt-forming Ti-6Al-4&#xa0;V body-centered cubic lattice structures were investigated. The results showed that the modulus of elasticity, compressive strength, and energy absorption values of the structure increased by 60.58, 57.90, and 51.30% when the radius of the filet was increased from 0.15 to 0.6&#xa0;mm, respectively; the damage form of the specimen changed from local diagonal shear to layer-by-layer collapse; the finite element data showed that the maximum stress of the structure was reduced by up to 42.19%, and the stress range was scaled down by up to 47.83%. The lattice structure with a filet radius of 0.3&#xa0;mm offers the best price/performance ratio and practical value. The fracture morphology of the specimens all exhibit dimple and smooth plane morphological features, indicating that the form of damage to the lattice structure is a combination of brittleness and toughness. The study's result provides a reference for the enhanced design of BCC lattice structure nodes and predictable failure design.</p>

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Effect of Different Nodal Corner Radii on the Compressive Properties of L-PBF Molded Ti-6Al-4V Body-Centered Cubic Lattice Structure

  • 期刊论文

  • 发表日期：

    2025年11月23日

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  • Wentian Shi,
  • Biao Guo,
  • Ruihao Jiang,
  • Jie Li,
  • Longdi Yuan

摘要

Four lattice structures with different rounded corner sizes were designed and prepared, and the effects of nodal rounded corner sizes on the compressive properties of laser powder bed melt-forming Ti-6Al-4 V body-centered cubic lattice structures were investigated. The results showed that the modulus of elasticity, compressive strength, and energy absorption values of the structure increased by 60.58, 57.90, and 51.30% when the radius of the filet was increased from 0.15 to 0.6 mm, respectively; the damage form of the specimen changed from local diagonal shear to layer-by-layer collapse; the finite element data showed that the maximum stress of the structure was reduced by up to 42.19%, and the stress range was scaled down by up to 47.83%. The lattice structure with a filet radius of 0.3 mm offers the best price/performance ratio and practical value. The fracture morphology of the specimens all exhibit dimple and smooth plane morphological features, indicating that the form of damage to the lattice structure is a combination of brittleness and toughness. The study's result provides a reference for the enhanced design of BCC lattice structure nodes and predictable failure design.