Revealing the (positive) role of porosity within polymeric additively manufactured lattices via X-ray computed tomography

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures Pub Date : 2025-06-03 DOI:10.1016/j.ijsolstr.2025.113488

Danilo Bruson , Itziar Serrano-Munoz , Tobias Fritsch , Henning Markötter , Manuela Galati

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Abstract

The mechanical properties of lattice geometries are known to be significantly influenced by a variety of manufacturing defects. This study investigates the influence of porosity on the mechanical behaviour of strut-based body-centred cubic (BCC) lattice structures produced with powder bed fusion with laser beam PBF-LB/P using PA2200 nylon powder. The study combines advanced techniques, including in-situ laboratory X-ray computed tomography (XCT), synchrotron XCT to visualise pores and roughness in high resolution at a single-cell level and image-based finite element analysis (FEA). The findings show that failure in thin-walled AM lattices is governed by the combined effects of porosity morphology, location, surface roughness, and cross-section reduction. The presence of internal porosity is found to attenuate both the amplitude of elastic modulus fluctuations and the severity of stress concentrations induced by surface irregularities.

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通过x射线计算机断层扫描揭示聚合物增材制造晶格中孔隙度的（积极）作用

众所周知，晶格几何的力学性能受到各种制造缺陷的显著影响。本文研究了孔隙率对以PA2200尼龙粉末为原料的PBF-LB/P粉末床熔接法制备的柱状体心立方（BCC）晶格结构力学行为的影响。该研究结合了先进的技术，包括原位实验室x射线计算机断层扫描（XCT），同步加速器XCT，在单细胞水平上以高分辨率显示孔隙和粗糙度，以及基于图像的有限元分析（FEA）。研究结果表明，薄壁AM晶格的失效是由孔隙形态、位置、表面粗糙度和截面减少的综合作用决定的。发现内部孔隙的存在可以减弱弹性模量波动的幅度和由表面不规则性引起的应力集中的严重程度。

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 Solids and Structures 物理-力学

CiteScore

6.70

自引率

8.30%

发文量

405

审稿时长

70 days

期刊介绍： The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.