The industrial sector is constantly exploring innovative ways to fully harness the advantages of additive manufacturing (AM) technologies. Among the many benefits of AM, design freedom stands out, enabling the production of lattice structures. These metamaterials are well-known for their tunable mechanical properties and are widely recognized for their energy absorption and lightweight characteristics across various fields. However, the widespread industrial adoption of these structures remains hindered by two significant challenges: the complex characterization of lattice structure fatigue resistance and the high manufacturing costs associated with AM products. To address these issues, this work proposes a methodology for predicting the fatigue resistance of lattice components made from polymeric materials. The research focuses on PA12 specimens produced using the industrially relevant MJF technology, which is more cost-effective compared to its metallic counterparts. By conducting fatigue tests on bulk specimens, material characteristics are analyzed, leading to the development of an algorithm that predicts the fatigue life of lattice structures. This is achieved through an energetic approach inspired by the Average Strain Energy Density method, traditionally applied to metallic materials.
On the characterization of fatigue resistance of PA12 lattice structures
Lorenzo RomanelliSecondo
;Ciro Santus;
2025-01-01
Abstract
The industrial sector is constantly exploring innovative ways to fully harness the advantages of additive manufacturing (AM) technologies. Among the many benefits of AM, design freedom stands out, enabling the production of lattice structures. These metamaterials are well-known for their tunable mechanical properties and are widely recognized for their energy absorption and lightweight characteristics across various fields. However, the widespread industrial adoption of these structures remains hindered by two significant challenges: the complex characterization of lattice structure fatigue resistance and the high manufacturing costs associated with AM products. To address these issues, this work proposes a methodology for predicting the fatigue resistance of lattice components made from polymeric materials. The research focuses on PA12 specimens produced using the industrially relevant MJF technology, which is more cost-effective compared to its metallic counterparts. By conducting fatigue tests on bulk specimens, material characteristics are analyzed, leading to the development of an algorithm that predicts the fatigue life of lattice structures. This is achieved through an energetic approach inspired by the Average Strain Energy Density method, traditionally applied to metallic materials.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
