Li Xuan, Wang Yu, Chu Chenglin, Han Linyuan, Bai Jing, Xue Feng
School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China; Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing, 211167, China.
School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China; Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, China.
J Mech Behav Biomed Mater. 2020 May;105:103707. doi: 10.1016/j.jmbbm.2020.103707. Epub 2020 Feb 18.
A novel and economic device is developed for simulating the physiological mechanochemical conditions. The degradation behaviors of poly-lactic acid (PLA) based composite reinforced with magnesium alloy wires (Mg wires/PLA) under dynamic compression and bending loads are investigated. The results denote the dynamic loads significantly influence the degradation behaviors of the composite. The dynamic bending load would profoundly promote the degradation of Mg wires in the composite and then accelerate the mechanical properties loss of the composite. The bending strength retention of the composite under consistent dynamic bending load at a magnitude of 5.6 N (about 5.6 MPa for the maximum stress at the middle surface) after 21 days immersion is about 53.3%, comparing to 69.7% for the dynamic compression load at a magnitude of 12 N (0.5 MPa for the compression stress). Furthermore, a numerical model is successfully postulated to elucidate the bending strength evolution of the composite under different dynamic loading conditions.
开发了一种新型且经济的装置来模拟生理机械化学条件。研究了镁合金丝增强聚乳酸（PLA）基复合材料（Mg丝/PLA）在动态压缩和弯曲载荷下的降解行为。结果表明，动态载荷显著影响复合材料的降解行为。动态弯曲载荷会极大地促进复合材料中镁丝的降解，进而加速复合材料力学性能的损失。在5.6 N（中表面最大应力约为5. MPa）的恒定动态弯曲载荷下浸泡21天后，复合材料的弯曲强度保留率约为53.3%，而在12 N（压缩应力为0.5 MPa）的动态压缩载荷下为69.7%。此外，成功建立了一个数值模型来阐明复合材料在不同动态加载条件下的弯曲强度演变。
