Energy absorbing 4D printed meta-sandwich structures: load cycles and shape recovery

The present study investigates the behavior of solid cellular structures in polylactic acid (PLA) achieved by FDM technology (fusion deposition modelling). The geometries are permanently deformed by compressive stress and then subjected to shape recovery through the application of a thermal stimulus...

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Bibliographic Details
Published inInternational journal of advanced manufacturing technology Vol. 127; no. 3-4; pp. 1779 - 1795
Main Authors Gisario, Annamaria, Desole, Maria Pia, Mehrpouya, Mehrshad, Barletta, Massimiliano
Format Journal Article
LanguageEnglish
Published London Springer London 01.07.2023
Springer Nature B.V
Subjects
CAE) and Design
Cellular structure
Compressive properties
Computer-Aided Engineering (CAD
Damage
Damping
Density
Energy
Energy absorption
Engineering
Industrial and Production Engineering
Mechanical Engineering
Mechanical properties
Media Management
Microcracks
Original Article
Polylactic acid
Recovery
Repeated loading
Sandwich structures
Shape recovery
4D printing
Metamaterials
Energy absorbing
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Summary:The present study investigates the behavior of solid cellular structures in polylactic acid (PLA) achieved by FDM technology (fusion deposition modelling). The geometries are permanently deformed by compressive stress and then subjected to shape recovery through the application of a thermal stimulus. The structures are submitted to medium–high and medium–low compression stresses, evaluating the mechanical properties and the absorption energy as the number of cycles varies. The study shows that the ability to absorb energy is related to the density of the model, as well as the degree of damage observed, which increases with increasing number of load cycles. The strongest geometry is the lozenge grid, which is the most reliable. It shows no damage with increasing compression cycles and keeps its capability to absorb energy almost constant. The increase in lozenge grid density leads to an improvement in both mechanical strength and absorption energy, as well as a lower incidence of microcracks in the geometry itself due to the repeated load cycles. These results open up a broad spectrum of applications of custom-designed solid cellular structures in the field of energy absorption and damping.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-023-11638-0