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.

开发了一种新颖且经济的设备来模拟生理机械化学条件。研究了镁合金丝（Mg丝/ PLA）增强的聚乳酸（PLA）基复合材料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着影响复合材料的降解行为。动态弯曲载荷将深刻促进复合材料中镁丝的降解，进而加速复合材料的机械性能损失。浸入21天后，复合材料在恒定的动态弯曲载荷下（在5.6 N（中间表面的最大应力约为5.6 MPa））下保持恒定的弯曲强度约为53.3％，而动态压缩载荷在69.7％时保持不变。大小为12 N（0。压缩应力为5 MPa）。此外，成功地建立了一个数值模型，以阐明复合材料在不同动态载荷条件下的抗弯强度演变。