TY - JOUR
T1 - Fracture mechanisms of additively manufactured polylactide
T2 - Effect of in vitro hydrolytic degradation
AU - Moetazedian, Amirpasha
AU - Gleadall, Andrew
AU - V Silberschmidt, Vadim
N1 - Funding Information:
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/6/15
Y1 - 2022/6/15
N2 - This is the first study considering the effect of in vitro hydrolytic degradation at 37 °C on fracture mechanism of the most important aspect of additive manufacturing – the interface between layers. Specimens were tested transversely (failure between layers) and longitudinally (failure directly through extruded filaments) under testing conditions similar to those in the human body (submerged at 37 °C). Feature of fracture surface, including striations and localised ductility, significantly changed when degradation caused a reduction in molecular weight below 40 kDa from the initial 240 kDa or an increase in crystallinity above 12%. Such changes indicated a transition from more ductile to more brittle fracture during degradation.
AB - This is the first study considering the effect of in vitro hydrolytic degradation at 37 °C on fracture mechanism of the most important aspect of additive manufacturing – the interface between layers. Specimens were tested transversely (failure between layers) and longitudinally (failure directly through extruded filaments) under testing conditions similar to those in the human body (submerged at 37 °C). Feature of fracture surface, including striations and localised ductility, significantly changed when degradation caused a reduction in molecular weight below 40 kDa from the initial 240 kDa or an increase in crystallinity above 12%. Such changes indicated a transition from more ductile to more brittle fracture during degradation.
KW - Additive manufacturing
KW - Crystallinity
KW - Degradation
KW - Fracture
KW - Molecular weight
UR - http://www.scopus.com/inward/record.url?scp=85131102407&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2022.108572
DO - 10.1016/j.engfracmech.2022.108572
M3 - Article
AN - SCOPUS:85131102407
VL - 269
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
SN - 0013-7944
M1 - 108572
ER -