期刊
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
卷 105, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmbbm.2020.103707
关键词
Mg wires/PLA composite; Degradation behaviors; Dynamic bending load; Dynamic compression load
资金
- Natural Science Foundation of Jiangsu Province [BK20181020]
- introduction of Talent Research Fund in Nanjing Institute of Technology [YKJ201705]
- National Natural Science Foundation of China [31570961, 51771054]
- State Key Program of National Natural Science Foundation of China [51631003]
- National Key Research and Development Program of China [2016YFC1102402]
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.
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