期刊
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
卷 28, 期 18, 页码 2196-2204出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09205063.2017.1388993
关键词
3D-printing technology; poly lactic acid (PLA); scaffolds; fatigue; polymers
资金
- Natural Science Foundation of Tianjin (NSFT) [17JCQNJC03100]
- National Natural Science Foundation of China (NSFC) [51305295]
In the study, the low-cycle fatigue behaviors of 3D-printed poly lactic acid (PLA) scaffolds with 60% porosity and two kinds of geometrical pores were investigated under strain-controlled loading. The obtained Delta epsilon(a)-N-f curves were fitted by Coffin-Manson relation. The mechanical stability of the porous structure under cyclic loading was studied. Both kinds of specimens undergo the strain softening after the initial cyclic hardening. The scaffold with circular pore exhibits stable resistance to the fatigue damage which is desirable for bone repairing. Regarding to the accumulation of inelastic deformation, the triangular-scaffold is more sensitive to the cyclic load. The superior fatigue behaviors of the scaffold with circular pore is attributed to homogeneous distribution of the applied mechanical stress and diminishing stress concentration by the introduction of circular pore.
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