{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T15:29:23Z","timestamp":1789658963391,"version":"4.0.1"},"reference-count":69,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T00:00:00Z","timestamp":1789516800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Internal Grant Agency of the Faculty of Engineering, Czech University of Life Sciences Prague","award":["2026:31140\/1312\/3112"],"award-info":[{"award-number":["2026:31140\/1312\/3112"]}],"id":[{"id":"https:\/\/ror.org\/0415vcw02","id-type":"ROR","asserted-by":"crossref"}]},{"award":["2026:31140\/1312\/3112"],"award-info":[{"award-number":["2026:31140\/1312\/3112"]}],"id":[{"id":"https:\/\/ror.org\/0415vcw02","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>This article examines the reuse of waste polyurethane foam (PUF) as a material in line with circular economy principles. The main objective was to evaluate how crushed polyurethane filler of different bulk densities\u201435 kg\u00b7m\u22123 (PUF35), 60 kg\u00b7m\u22123 (PUF60), and their blends at 1\u20135 wt%\u2014affects the mechanical behaviour and structural integrity of hybrid composite systems and bonded laminated joints. An epoxy resin matrix was combined with 3D-printed polylactide (PLA) honeycomb structures, with rectangular and hexagonal core geometries. Static tensile tests showed that the blended filler (PUF35\/60) preserves tensile strength and increases the modulus of elasticity for both core geometries, reaching maximum values at 4 wt% (3.8 GPa for rectangular, 3.6 GPa for hexagonal cores). In bonded lap joints, 1 wt% PUF35 resulted in the highest tensile adhesive bond strength (13.3 MPa). SEM confirmed a high-quality phase interface and continuous adhesive contact between the epoxy matrix and the 3D-printed PLA surface, with dominant cohesive failure and effective mechanical anchoring of foam particles, even near local printing defects. The results confirm mechanically recycled PUF as a promising filler for advanced sandwich structures and adhesive systems.<\/jats:p>","DOI":"10.3390\/ma19183935","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T13:50:27Z","timestamp":1789566627000},"page":"3935","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mechanical Properties and Microstructure of Bonded Joints and Hybrid Structures with a 3D-Printed Honeycomb Core Modified with an Epoxy Matrix Filled with Recycled Polyurethane Foam"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-8481-6421","authenticated-orcid":false,"given":"Michal","family":"Penc","sequence":"first","affiliation":[{"name":"Faculty of Engineering, Czech University of Life Sciences, Kam\u00fdck\u00e1 129, 165 00 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3460-4254","authenticated-orcid":false,"given":"Miroslav","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, Czech University of Life Sciences, Kam\u00fdck\u00e1 129, 165 00 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-3551-3465","authenticated-orcid":false,"given":"Ji\u0159\u00ed","family":"Mar\u010dan","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, Czech University of Life Sciences, Kam\u00fdck\u00e1 129, 165 00 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8505-4443","authenticated-orcid":false,"given":"Rajesh Kumar","family":"Mishra","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, Czech University of Life Sciences, Kam\u00fdck\u00e1 129, 165 00 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaroslava","family":"Svobodov\u00e1","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, Czech University of Life Sciences, Kam\u00fdck\u00e1 129, 165 00 Prague, Czech Republic"},{"name":"Faculty of Mechanical Engineering, J. 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