Low-cycle fatigue behavior of 3d-printed PLA-based porous scaffolds
Low-cycle fatigue behavior of 3d-printed PLA-based porous scaffolds
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DOI：
10.1016/j.compositesb.2016.04.067
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发表时间：
2016-07-15
影响因子：
13.1
通讯作者：
Kaloshkin, S. D.
中科院分区：
文献类型：
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作者：
Senatov, F. S.;Niaza, K. V.;Kaloshkin, S. D.
在本研究中，通过熔融长丝制造的3d打印方法获得了PLA和PLA/15%重量的HA多孔支架，用于骨置换，具有预建模结构。支架的平均孔径为700 gm，平均孔隙率为30 vol. %。在低循环试验中，研究了三维多孔支架的弹性模量、试样高度、弹性变形、累积能量和结构特性。在循环加载过程中，观察到印刷层的高度下降、孔隙坍塌、分层、弯曲和剪切以及裂纹的生长和扩展。分散的HA颗粒的引入降低了缺陷积累的速度。PLA/15%HA多孔支架具有较大的抗裂性，可在21 MPa的循环载荷下长时间不变化地发挥作用，具有作为骨小梁置换植入物的潜力。(C) 2016 Elsevier Ltd.版权所有。
In the present work PLA and PLA/15% wt. HA porous scaffolds for bone replacements with pre-modeled structure were obtained by 3D-printing by fused filament fabrication. The average pore size and porosity of the scaffolds were 700 gm and 30 vol. %, respectively. The modulus of elasticity, height of the samples, elastic deformation, accumulated energy and structural characteristics of 3D porous scaffolds were studied during the low-cycle tests. A decrease in the height, collapse of pores, delamination, bending and shear of the printed layers, growth and propagation of cracks during cyclic loading was observed. The introduction of dispersed HA particles reduced the rate of accumulation of defects. PLA/15%HA porous scaffolds with a larger crack resistance have the potential to be used as implants for trabecular bone replacement which are able to function under cyclic loading at a stress of 21 MPa for a long time without change. (C) 2016 Elsevier Ltd. All rights reserved.