Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Indentation and Fragmentation of Wood Under Low-Speed Impact
Ist Teil von
Journal of dynamic behavior of materials, 2023-06, Vol.9 (2), p.140-157
Ort / Verlag
Cham: Springer International Publishing
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Wood is an impact-resistant biological material architectured with fibers and hexagonal cells. Impact and quasi-static compression of natural wood perpendicular to fibers leads to indentation with fiber compaction and splitting (crack propagation along fibers). Conversely, loading parallel to fiber results in indentation and radial cracking before fragmentation. The impulse and energy absorbed manifest as indentation, cracking, and fragmentation depending on the loading rate and fiber orientation. This article highlights indentation and fragmentation in two species of wood: Neem (
Melia Dubia
) and Jackfruit (
Artocarpus Heterophyllus
).Guided by ASTM D7136 standard drop weight tests with a 0.025 m diameter, 22 kg steel indenter are conducted for characterizing indentation, cracking, and fragmentation for two fiber orientations of wood. Quasi-static compression tests also conducted with the same punch diameter further characterize specimen stiffness and indentation patterns for modeling the phenomena from a mechanics viewpoint as well as statistics standpoint. Hertzian mechanics provides a simple means for relating impulse and energy requirement with indentation. Interestingly, Gaudin-Schumann’s power law with Schumann index equal to 2.5, widely applied for brittle materials like ceramic, glass, and rock, also applies to the two wooden species investigated here. Extending the investigations presented here can provide useful data for designing sports goods, dwellings, boats, and furniture.